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Click here for L-Tryptophan from LIDTKE
Size: 60 capvegi
S.Retail: $ 27.95
25% OFF
$ 20.96
LIDTKE L-Tryptophan - 60 capvegi
L-Tryptophan Complete from LIDTKE is a unique formulation designed to maximize and maintain healthy levels of serotonin in the brain. Once in your cells, L-Tryptophan can follow many pathways. The challenge is to encourage L-Tryptophan to follow the one branch that leads to serotonin — and to discourage L-Tryptophan from producing undesirable kynurenine or quinolinic-acid compounds. Lidtke has studied these pathways and has identified cofactors and coenzymes that uniquely help produce and sustain healthy serotonin levels, for a brighter outlook and a more productive life. Vegetarian and non-GMO.
Suggested Use
(Adults): Take one (1) to three (3) capsules or as directed by your doctor. Best if taken at bedtime or between meals.
Supplement Facts
Serving Size: 3 capsules
Servings: 20
Amount Per Serving % Daily Value
Vitamin C (as calcium ascorbate) 90 mg 150%
Vitamin B2 (as riboflavin) 15 mg 885%
Vitamin B3 (as niacinamide) 60 mg 300%
Folate (as folic acid) 800 mcg 200%
Pyridoxal 5-Phosphate
(enzymatic form of vitamin B6)
15 mg **
L-Tryptophan, USP† 1,050 mg **
L-Lysine HCl, USP† 300 mg **
Proprietary blend:
Curcumin (from turmeric root), Magnesium glycinate, Magnesium taurinate
570 mg **
** Daily Value not established
†As certified by the manufacturer.
Other Ingredients
Vegetarian capsule (kosher).
Warnings
KEEP OUT OF REACH OF CHILDREN. If you are pregnant, lactating, taking any medications (especially MAOIs, Tricyclics, or SSRIs), or have a medical condition, consult your doctor. Discontinue use if adverse reaction occurs. Do not use if seal is damaged or missing. Keep lid tightly closed. Keep in a cool, dry place. |
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Click here for L-Tryptophan from LIDTKE
Size: 120 capvegi
S.Retail: $ 39.95
25% OFF
$ 29.96
LIDTKE L-Tryptophan - 120 capvegi
Lidtke L-Tryptophan supports healthy sleep and mood. Lidtke L-Tryptophan is a natural building block of serotonin, the neurotransmitter that plays an important role in appetite, mood, normal sleep patterns and nervous system health. When your body needs extra help producing serotonin for peaceful sleep and a more relaxed outlook, choose Lidtke L-Tryptophan. Lidtke L-Tryptophan is vegetarian, Kosher, and non-GMO.
Suggested Use
Take one (1) to three (3) capsules as directed by a health-care professional. Best if taken at bedtime or between meals.
Supplement Facts
Serving Size: 3 Capsules
Servings Per Container: 40
Amount Per Serving %DV
L-Tryptophan, USP 1500 mg *
*Daily Value Not Established
Other Ingredients
Gelatin Capsule (Kosher), Vegetable Stearate (from Palm Oil)
No Added: gluten, wheat, corn, yeast, soy, dairy, eggs, tree nuts, peanuts, fish, shellfish, salt, sugar, artificial color, flavor or preservatives. Non-GMO.
Warnings
Keep in a cool, dry place. Keep out of reach of children. If you are pregnant, lactating, taking any medications (especially MAOIs, Tricyclics, or SSRIs) or have a medical condition, consult your doctor. Work up to the desired level gradually. Discontinue use if adverse reaction occurs. Do not use if seal is damaged or missing. |
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Click here for L-Tryptophan 1000 mg from BEST NATURALS
Size: 60 TAB
S.Retail: $ 34.99
26% OFF
$ 25.89
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Click here for L-Tryptophan 500 mg from Best Naturals
Size: 120 cap
S.Retail: $ 34.99
26% OFF
$ 25.89
| L-Tryptophan 500 mg by Best Naturals
L-tryptophan is an essential amino acid. It is critical for the production of serotonin an melatonin, which help to support a positive mood, healthy sleep patterns and proper immune function. Best Naturals L-Tryptophan is extremely pure and is regularly tested to ensure the highest standards of quality.
All Best Naturals products are manufactured in accordance with Good Manufacturing Practices (GMP), among the highest standards in the world -- Proudly Made in USA -- Purity & Potency Guaranteed |
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Click here for L-Tryptophan 500 mg from SOURCE NATURALS
Size: 120 capsules
S.Retail: $ 32.50
26% OFF
$ 24.05
Unlocking Positive Thoughts: The Power of Source Naturals L-TryptophanHistory of L-Tryptophan:L-Tryptophan, an essential amino acid, has been an area of scientific interest for numerous decades. Its significance was acknowledged in nutritional science as early as the 20th century, primarily due to its pivotal role in human metabolism and brain function. Research into L-Tryptophan has revealed its critical function as a precursor to serotonin and melatonin, neurotransmitters that regulate mood, sleep, and stress responses. Over time, L-Tryptophan has transitioned from merely being recognized for its nutritional value to being celebrated for its therapeutic potential in addressing psychological well-being and sleep disorders. Function of L-Tryptophan in the Body:In the human body, L-Tryptophan serves a crucial function by acting as a stepping stone in the synthesis of serotonin and melatonin. These compounds are essential for regulating mood balance and sleep-wake cycles, respectively. By influencing these key neural pathways, L-Tryptophan plays a significant role in promoting relaxation, enhancing mood, and ensuring restful sleep. For individuals navigating the challenges of maintaining a positive outlook and seeking natural avenues to enhance their mental well-being, Source Naturals L-Tryptophan emerges as a beacon of hope. This highly pure form of the essential amino acid not only promises a non-pharmaceutical pathway to emotional balance but also offers a scientifically backed solution to improving sleep quality. By integrating Serene Science® L-Tryptophan into their daily regimen, customers can look forward to nurturing a state of serenity and elevated mood, thus embodying the essence of a life experienced in its fullest positivity. Additional Related Benefits:- Promotes Relaxation: Contributes to a calm and relaxed state, facilitating stress management.
- Supports Restful Sleep: Enhances the quality of sleep, allowing for a rejuvenating rest.
- Encourages Positive Mood: Aids in uplifting mood, contributing to overall emotional well-being.
- Potential Benefits to B Vitamin Levels: When necessary, converts to niacin, helping to fulfill essential vitamin requirements and support metabolic processes.
- Quality Assurance: Rigorously tested, ensuring an exceptionally pure product that meets the highest standards of quality.
L-Tryptophan stands as a key pillar in the foundation of mental health and emotional equilibrium. It is more than merely an amino acid; it is the precursor to serotonin, often referred to as the "feel-good" neurotransmitter, and melatonin, the hormone pivotal for regulating sleep cycles. This essential nutrient thus plays a dual role, not only enhancing the mood of individuals by increasing serotonin levels but also promoting better sleep by facilitating melatonin production, laying the groundwork for a sound mind in a sound body. Harness the power of Source Naturals L-Tryptophan to unlock the door to a happier, more relaxed state of being. By incorporating this scientifically backed, high-purity amino acid into your daily routine, you can pave the way to improved mental well-being and restorative sleep, opening up new avenues for emotional balance and a positive outlook on life. Don't wait to take control of your emotional and psychological well-being. Act now to invest in your happiness and peace of mind with Source Naturals L-Tryptophan, and start your journey towards a brighter, more serene tomorrow.
| Supplement Facts for Capsule Serving Size: 3 Capsules | | | Amount | %DV | | L-Tryptophan (25 mg naicin equivalents) | 1.5 g | | | | Suggested Use: 1 capsule three times daily, between meals and preferably with fruit juice. To support restful sleep, take an additional 3 capsules before bed. Other Ingredients: gelatin (capsule), magnesium stearate, silica, microcrystalline cellulose, and dibasic calcium phosphate. Warning: If you are pregnant, may become pregnant, breastfeeding, or are taking medications such as SSRIs or MAOIs, consult your health care professional before using this product. Do not use if either tamper-evident seal is broken or missing. Keep out of the reach of children. Store in a cool, dry place. Allergies: Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no preservatives, or artificial color, flavor or fragrance.
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Click here for L-Tryptophan 500 mg from NOW
Size: 2 oz
S.Retail: $ 35.99
40% OFF
$ 21.59
Product Overview & Quick Specs
Think of L-tryptophan like raw lumber your brain needs to build steady daytime mood and restorative nighttime sleep. NOW® L-Tryptophan Powder delivers 950 mg of pure, crystalline free-form amino acid (chemical formula: C11H12N2O2) per two 1/4 level teaspoons [1, 3]. This unflavored powder supports healthy serotonin for positive mood and evening melatonin for restful sleep [1, 2].
Quick Specs Snapshot
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✓
Active Form & Potency: 950 mg of pure, crystalline Free-Form L-Tryptophan per two 1/4 level teaspoons (approx. 1 g).
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✓
Primary Target: Central nervous system serotonin synthesis pathways and pineal gland nighttime melatonin production [1, 4].
-
✓
Supply & Value: 2 oz (57 g) container provides about 57 full servings, offering customizable teaspoon dosing for pennies per day.
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✓
Purity & Dietary Status: Vegetarian/vegan formulation, non-GMO, and free of wheat, gluten, soy, milk, egg, fish, shellfish, and tree nuts.
Buyer's Guide & Form Comparison
Why the Free-Form Powder Structure Matters
Think of dietary protein like a crowded commuter bus. In whole foods like poultry or dairy, tryptophan is locked inside dense protein chains alongside competing amino acids. It must compete for intestinal doors and brain transport gates [4]. NOW® utilizes pure Free-Form L-Tryptophan. This unbound molecule enters the bloodstream rapidly without requiring complex digestive breakdown.
Unlike 5-HTP supplements that force serotonin creation without restraint, free-form L-tryptophan respects your body's natural rate-limiting enzymes (tryptophan hydroxylase). Your brain converts exactly what it requires without neurotransmitter spikes [3, 4]. Furthermore, discount commodity big box store brands often skip expensive raw material testing, risking industrial contaminants. NOW® subjects every production lot to strict in-house laboratory screening to ensure zero Peak E or microbial impurities.
Is This Formula Right for You?
Best Choice For:
-
✓
Restless Sleepers: Adults seeking to fall asleep faster and reduce nighttime waking without morning grogginess [1, 2].
-
✓
Pill-Free Flexible Dosing: Shoppers who dislike swallowing bulky tablets and prefer stirring fine powder into water or juice.
-
✓
Daily Stress & Mood Support: Individuals wanting to encourage emotional balance, patience, and positive social interaction [3].
Consider Another Option If:
-
✗
Taking Prescription Antidepressants: Anyone taking SSRIs or MAOIs must avoid supplemental L-tryptophan due to serotonin interactions.
-
✗
Frequent Travelers Needing Portability: Shoppers who prefer pre-measured, mess-free travel capsules over measuring loose powder.
-
✗
Immediate Daytime Energy: Anyone seeking an active morning stimulant, as tryptophan promotes natural relaxation and calm.
Store Guarantee: Every purchase is backed by VitaNet®, LLC's 31-year reputation and unconditional 100% money-back guarantee (even on opened bottles), allowing customers to evaluate digestive tolerance risk-free.
How It Works in the Body
1. Crossing the Blood-Brain Barrier (LAT1 Transport)
Think of the blood-brain barrier like a guarded security turnstile. Amino acids must show a specific biological pass to enter brain tissue. Tryptophan shares this entrance with large neutral amino acids (the LAT1 transport system) [4]. When consumed away from heavy dietary proteins, free-form tryptophan clears the turnstile without competition. It enters brain tissue efficiently to begin neurotransmitter synthesis [4].
2. Synthesizing the Mood Messenger (Serotonin Production)
Think of brain cells like a precision assembly line. Inside neurons, an enzyme tool (tryptophan hydroxylase) converts L-tryptophan into intermediate 5-HTP [4]. A secondary enzyme (aromatic L-amino acid decarboxylase) quickly transforms 5-HTP into active serotonin (5-hydroxytryptamine) [3]. Serotonin acts as the body's primary conductor for emotional poise. It encourages positive mood, patience, and cooperative social interactions [3].
3. Regulating the Sleep Clock (Melatonin Conversion)
Think of your pineal gland like a natural light-sensitive dimmer switch. As night falls and light levels decline, specialized pineal enzymes convert serotonin into melatonin (N-acetyl-5-methoxytryptamine) [1, 2]. Melatonin signals your internal master clock that it is time for sleep. Clinical trials show that supplemental tryptophan significantly reduces sleep onset latency and decreases wakefulness after sleep onset [1, 2].
Daily Timing, Synergy & Realistic Timelines
Best Time to Take & Meal Pairings
Take one or two 1/4 level teaspoons 2 to 3 times daily on an empty stomach, or alongside a light carbohydrate snack. Think of carbohydrates like a cellular traffic escort. A small carbohydrate snack prompts a modest insulin release. Insulin pulls competing amino acids into muscle tissue, clearing an open lane for tryptophan to cross into the brain [4]. Avoid taking your dose with high-protein meals or dairy shakes.
Daily Schedule Strategy
For restful nighttime sleep, take your final dose 30 to 60 minutes before bedtime with 8 ounces of water (H2O) [1, 2]. For daytime mood support, take one 1/4 level teaspoon in the mid-to-late afternoon between lunch and dinner on an empty stomach [3, 4].
Smart Pairings & Separation Rules
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✓
Nutrient Synergies: Pairs well with Vitamin B-6 and Magnesium. These nutrients act as biological cofactors for enzymes that convert amino acids into active neurotransmitters [4].
-
✓
2-Hour Spacing Rule: Keep at least a 2-hour window between this powder and high-protein foods, branched-chain amino acids (BCAAs), or protein shakes to avoid carrier competition [4].
What to Expect Over Time
Days 1–7: Initial cellular uptake. You experience a smoother evening transition into sleep, shorter time spent tossing and turning, and restful nighttime recovery [1, 2].
Weeks 3–4: Tissue saturation and baseline support. Steady precursor availability helps replenish serotonin reserves, supporting balanced daytime mood and consistent sleep architecture [1, 3].
Months 2–3+: Long-term maintenance. Cumulative neurochemical equilibrium promotes steady emotional resilience, positive daily outlook, and dependable circadian rhythm alignment [1, 3].
Physical Feel, Sensory Traits & Clean Ingredients
Powder Format & Ease of Use
NOW® L-Tryptophan Powder provides fine, crystalline amino acid powder that eliminates the challenge of swallowing large tablets. Using standard kitchen measuring spoons, two 1/4 level teaspoons deliver precisely 950 mg of active free-form tryptophan. The powder suspends smoothly with a quick stir in cool or room-temperature water, tart cherry juice, or unsweetened applesauce.
Natural Aroma, Taste & Color
This pure powder is virtually odorless with a neutral, mild, and faintly sweet taste. It contains zero artificial flavorings, sweeteners, or synthetic masking agents. Natural powder color ranges from bright white to soft off-white across production lots, reflecting unbleached raw amino acids.
Other Ingredients Explained
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✓
Cellulose: A natural, plant-derived dietary fiber. It functions as a clean, hypoallergenic anti-caking agent to keep the fine amino acid powder loose, dry, and easily scoopable without synthetic chemical flow agents.
Proper Storage & Packaging
Keep the lid tightly closed and store in a cool, dry place after opening. Protect the powder from heat, light, and humidity. Do not eat the enclosed freshness packet, which protects the dry crystalline structure from moisture. This container is sold by weight, not volume, and is fully recyclable.
Manufacturer Quality & Lab Testing Standards
Discount big box store brands frequently cut costs by purchasing low-grade amino acids from unverified brokers without in-house quality verification. These budget products risk unlisted fillers, active ingredient degradation, and heavy metal contamination. NOW® protects your health with rigorous testing in private ISO/IEC 17025:2017 accredited analytical facilities:
✓ Peak E & Microbial Purity Clearance
Every single production lot of NOW® L-Tryptophan is analyzed and certified free of Peak E and harmful microbial contamination. Finished lots undergo comprehensive culture tests to confirm the total absence of Salmonella spp., Escherichia coli, and Staphylococcus aureus.
✓ Heavy Metal Detection via ICP-MS
NOW tests every raw material batch using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). This instrument detects elemental contaminants down to parts-per-billion (ppb) levels, ensuring safety thresholds that beat strict California Proposition 65 benchmarks for lead, arsenic, cadmium, and mercury.
✓ Molecular Identity & Potency Verification via HPLC
Using High-Performance Liquid Chromatography (HPLC), NOW chemists verify the unique chemical fingerprint of free-form L-tryptophan. This guarantees that every scoop provides 100% of the declared 950 mg active potency, free from non-protein nitrogen adulteration, manufactured in NPA 'A-rated' cGMP facilities certified by UL Solutions.
Complete Supplement Facts Panel
Supplement Facts
Serving Size: Two 1/4 Level Teaspoons (approx. 1 g)
Servings Per Container: about 57
| Description |
Amount per Serving |
% Daily Value |
| L-Tryptophan (Free-Form) |
950 mg |
* |
|
* Daily Value not established.
|
Other Ingredients: Cellulose.
Allergen Notice: Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Caution: For adults only. Consult physician if pregnant/nursing, taking medication (especially antidepressants such as SSRIs and MAOIs), or have a medical condition. May cause drowsiness. Do not use with alcoholic beverages or while operating heavy machinery. Keep out of reach of children.
Packaging & Storage Notice: Do not eat freshness packet enclosed. This product is sold by weight not volume. Store in a cool, dry place after opening. Please Recycle.
Curator's Note & Retail Heritage
Curated and shipped directly by VitaNet®, LLC, established in 1995 with our brick-and-mortar headquarters located at 887 Edison Street Northwest, Hartville, Ohio 44632. Bringing over 31 years of dedicated supplement curation and raw-material verification, we maintain direct distribution partnerships to guarantee genuine, factory-fresh products stored in climate-controlled conditions.
As a Better Business Bureau A+ accredited company, every order includes our unconditional 100% money-back guarantee with return shipping covered, even on opened bottles. For product assistance, contact our Ohio-based customer support team directly at (330) 877-8786.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Scientific References & Clinical Studies
-
Sutanto, C. N., Loh, W. W., & Kim, J. E., "The impact of tryptophan supplementation on sleep quality: a systematic review, meta-analysis, and meta-regression," Nutrition Reviews, 2022. PMID: 33942088.
-
Hartmann, E., "Effects of L-tryptophan on sleepiness and on sleep," Journal of Psychiatric Research, 1982. PMID: 6764927.
-
aan het Rot, M., Moskowitz, D. S., Pinard, G., & Young, S. N., "Social behaviour and mood in everyday life: the effects of tryptophan in quarrelsome individuals," Journal of Psychiatry & Neuroscience, 2006. PMID: 16862243.
-
Fernstrom, J. D., "Role of precursor availability in control of monoamine biosynthesis in brain," Physiological Reviews, 1983. PMID: 6132421.
Frequently Asked Questions
How do I accurately measure a 950 mg serving of NOW L-Tryptophan Powder without a milligram scale?
You can easily measure your dose using standard kitchen measuring spoons. Take two level 1/4 teaspoons (which equals one level 1/2 teaspoon total). Fill the 1/4 teaspoon spoon and sweep it flat across the rim with the back of a butter knife. Two level 1/4 teaspoons deliver approximately 1 gram of total powder, providing 950 mg of pure free-form L-tryptophan.
Why is L-Tryptophan powder best taken with a carbohydrate snack rather than protein?
Tryptophan competes with other large neutral amino acids to cross the blood-brain barrier [4]. When you eat protein-dense foods, your bloodstream fills with competing amino acids that crowd out tryptophan at brain transport gates. A small carbohydrate snack prompts a gentle insulin release that draws competing amino acids into muscle tissue, leaving an open pathway for tryptophan to enter the brain and synthesize serotonin [4].
How does free-form L-Tryptophan powder compare to taking direct 5-HTP supplements?
Direct 5-HTP enters the brain and converts automatically into serotonin without biological rate limits. In contrast, free-form L-tryptophan relies on a rate-limiting cellular enzyme called tryptophan hydroxylase [3, 4]. This checkpoint allows your body to synthesize exactly the amount of serotonin and nighttime melatonin it requires, preventing excessive neurotransmitter spikes and supporting sustained emotional balance.
Can I take NOW L-Tryptophan Powder during the day for stress and mood without falling asleep?
Yes, provided you adjust your timing. For daytime mood and stress resilience, take one 1/4 level teaspoon in the mid-to-late afternoon between meals. Daylight naturally suppresses the conversion of serotonin into melatonin, allowing the amino acid to support calm focus without triggering drowsiness. However, if you are particularly sensitive to relaxation effects, avoid driving or operating machinery after your initial dose [1, 2].
Is it safe to take L-Tryptophan if I am currently taking prescription antidepressant medications?
No. You must not combine supplemental L-tryptophan with prescription antidepressants, including Selective Serotonin Reuptake Inhibitors (SSRIs) or Monoamine Oxidase Inhibitors (MAOIs), without direct physician supervision. Because both increase synaptic serotonin levels, combining them creates a serious risk of serotonin syndrome, a potentially dangerous neurological condition. Always consult your prescribing doctor before starting any amino acid regimen.
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Click here for L-Tryptophan 500 mg from NOW
Size: 120 Vcaps
S.Retail: $ 39.99
40% OFF
$ 23.99
Product Overview & Quick Specs
Think of L-tryptophan like raw lumber your brain needs to build steady daytime mood and restorative nighttime sleep. NOW® L-Tryptophan 500 mg delivers pharmaceutical-grade, crystalline free-form amino acids (chemical formula: C11H12N2O2) in convenient vegetarian capsules [1, 3]. Each 2-capsule serving provides 1,000 mg of pure L-tryptophan to support healthy serotonin for emotional balance and evening melatonin for sound sleep [1, 2].
Quick Specs Snapshot
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✓
Active Form & Potency: 1,000 mg (1 g) of pure Free-Form L-Tryptophan per 2-capsule serving (500 mg per single veg capsule).
-
✓
Primary Target: Central nervous system serotonin synthesis pathways and pineal gland nighttime melatonin conversion [1, 4].
-
✓
Supply & Value: 120 vegetarian capsules deliver 60 full servings, providing a 2-month daily supply with flexible single-capsule dosing.
-
✓
Purity & Dietary Status: Vegetarian/vegan formulation, non-GMO, allergen-free (no gluten, soy, dairy, or nuts), bottled in 100% PCR recycled resin.
Buyer's Guide & Form Comparison
Why the Free-Form Capsule Structure Matters
Think of dietary protein like a crowded commuter train. In whole foods like poultry or dairy, tryptophan is locked inside dense protein chains alongside competing amino acids. It must compete for intestinal doors and brain transport gates [4]. NOW® utilizes pure Free-Form L-Tryptophan. This unbound molecule enters the bloodstream rapidly without requiring extensive enzymatic breakdown.
Unlike 5-HTP supplements that force serotonin creation without restraint, free-form L-tryptophan respects your body's natural rate-limiting enzymes (tryptophan hydroxylase). Your brain converts exactly what it requires without neurotransmitter spikes [3, 4]. Furthermore, discount commodity big box store brands often skip expensive raw material testing, risking industrial contaminants. NOW® subjects every production lot to strict in-house laboratory screening to ensure zero Peak E or microbial impurities.
Is This Formula Right for You?
Best Choice For:
-
✓
Restless Sleepers: Adults seeking to fall asleep faster and reduce nighttime waking without morning grogginess [1, 2].
-
✓
Flexible Dosing Seekers: Individuals who want the convenience of taking 1 capsule (500 mg) for daytime calm or 2 capsules (1,000 mg) for sleep.
-
✓
Daily Stress & Mood Support: Individuals wanting to encourage emotional balance, patience, and positive social interaction [3].
Consider Another Option If:
-
✗
Taking Prescription Antidepressants: Anyone taking SSRIs or MAOIs must avoid supplemental L-tryptophan due to serotonin interactions.
-
✗
Bulk Powder Preference: Shoppers who prefer stirring unflavored loose powders into large bedtime drinks rather than swallowing capsules.
-
✗
Immediate Daytime Energy: Anyone seeking an active morning stimulant, as tryptophan promotes natural relaxation and calm.
Store Guarantee: Every purchase is backed by VitaNet®, LLC's 31-year reputation and unconditional 100% money-back guarantee (even on opened bottles), allowing customers to evaluate digestive tolerance risk-free.
How It Works in the Body
1. Crossing the Blood-Brain Barrier (LAT1 Transport)
Think of the blood-brain barrier like a guarded security turnstile. Amino acids must show a specific biological pass to enter brain tissue. Tryptophan shares this entrance with large neutral amino acids (the LAT1 transport system) [4]. When consumed away from heavy dietary proteins, free-form tryptophan clears the turnstile without competition. It enters brain tissue efficiently to begin neurotransmitter synthesis [4].
2. Synthesizing the Mood Messenger (Serotonin Production)
Think of brain cells like a precision assembly line. Inside neurons, an enzyme tool (tryptophan hydroxylase) converts L-tryptophan into intermediate 5-HTP [4]. A secondary enzyme (aromatic L-amino acid decarboxylase) quickly transforms 5-HTP into active serotonin (5-hydroxytryptamine) [3]. Serotonin acts as the body's primary conductor for emotional poise. It encourages positive mood, patience, and cooperative social interactions [3].
3. Regulating the Sleep Clock (Melatonin Conversion)
Think of your pineal gland like a natural light-sensitive dimmer switch. As night falls and light levels decline, specialized pineal enzymes convert serotonin into melatonin (N-acetyl-5-methoxytryptamine) [1, 2]. Melatonin signals your internal master clock that it is time for sleep. Clinical trials show that supplemental tryptophan significantly reduces sleep onset latency and decreases wakefulness after sleep onset [1, 2].
Daily Timing, Synergy & Realistic Timelines
Best Time to Take & Meal Pairings
Take 1 to 2 veg capsules daily on an empty stomach, or alongside a light carbohydrate snack. Think of carbohydrates like a cellular traffic escort. A small carbohydrate snack prompts a modest insulin release. Insulin pulls competing amino acids into muscle tissue, clearing an open lane for tryptophan to cross into the brain [4]. Avoid taking your capsules with high-protein meals or dairy shakes.
Daily Schedule Strategy
For restful nighttime sleep, swallow 2 capsules (1,000 mg) with 8 ounces of water (H2O) 30 to 60 minutes before bedtime [1, 2]. For daytime mood support, take 1 capsule (500 mg) in the mid-to-late afternoon between lunch and dinner on an empty stomach [3, 4].
Smart Pairings & Separation Rules
-
✓
Nutrient Synergies: Pairs well with Vitamin B-6 and Magnesium. These nutrients act as biological cofactors for enzymes that convert amino acids into active neurotransmitters [4].
-
✓
2-Hour Spacing Rule: Keep at least a 2-hour window between this supplement and high-protein foods, branched-chain amino acids (BCAAs), or protein shakes to avoid carrier competition [4].
What to Expect Over Time
Days 1–7: Initial cellular uptake. You experience a smoother evening transition into sleep, shorter time spent tossing and turning, and restful nighttime recovery [1, 2].
Weeks 3–4: Tissue saturation and baseline support. Steady precursor availability helps replenish serotonin reserves, supporting balanced daytime mood and consistent sleep architecture [1, 3].
Months 2–3+: Long-term maintenance. Cumulative neurochemical equilibrium promotes steady emotional resilience, positive daily outlook, and dependable circadian rhythm alignment [1, 3].
Physical Feel, Sensory Traits & Clean Ingredients
Pill Format & Ease of Use
NOW® L-Tryptophan 500 mg is encapsulated in standard size "0" two-piece vegetarian capsules. The smooth plant-cellulose shell becomes naturally slick with water, gliding down the throat effortlessly without sticking. For individuals who dislike swallowing pills, the two halves pull apart cleanly, allowing you to stir the mild inner powder directly into water or applesauce.
Natural Aroma, Taste & Color
When swallowed whole, the capsules are odorless and tasteless. If opened, the inner amino acid powder has a neutral scent and a faint, mild sweetness with zero bitter aftertaste. Natural capsule color ranges from off-white to ivory across production lots, reflecting unbleached raw materials with zero synthetic dyes.
Other Ingredients Explained
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✓
Hypromellose (cellulose capsule): A clean, vegetarian capsule shell made from natural plant cellulose that dissolves quickly in stomach fluids.
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✓
Rice Flour: A hypoallergenic, gluten-free natural grain powder used to evenly fill empty space so each capsule delivers the exact 500 mg dose.
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✓
Ascorbyl Palmitate: A fat-soluble form of Vitamin C that acts as a natural antioxidant, protecting the delicate amino acid from oxidation.
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✓
Stearic Acid (vegetable source): A plant-derived fatty acid that lubricates encapsulation machinery so powders flow cleanly without sticking.
Proper Storage & Packaging
Keep the lid tightly closed and store in a cool, dry place after opening. Protect the capsules from excessive heat, light, and humidity. This bottle is manufactured from 100% post-consumer recycled (PCR) resin, protecting light-sensitive amino acids from degradation while reducing virgin plastic waste.
Manufacturer Quality & Lab Testing Standards
Discount big box store brands frequently cut costs by purchasing low-grade amino acids from unverified brokers without in-house quality verification. These budget products risk unlisted fillers, active ingredient degradation, and heavy metal contamination. NOW® protects your health with rigorous testing in private ISO/IEC 17025:2017 accredited analytical facilities:
✓ Peak E & Microbial Purity Clearance
Every single production lot of NOW® L-Tryptophan is analyzed and certified free of Peak E, ethylidene-bis-tryptophan, and other toxic synthetic impurities. Finished lots undergo comprehensive culture tests to confirm the total absence of Salmonella spp., Escherichia coli, and Staphylococcus aureus.
✓ Heavy Metal Detection via ICP-MS
NOW tests every raw material batch using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). This instrument detects elemental contaminants down to parts-per-billion (ppb) levels, ensuring safety thresholds that beat strict California Proposition 65 benchmarks for lead, arsenic, cadmium, and mercury.
✓ Molecular Identity & Potency Verification via HPLC
Using High-Performance Liquid Chromatography (HPLC), NOW chemists verify the unique chemical fingerprint of free-form L-tryptophan. This guarantees that every capsule provides 100% of the declared active potency, free from non-protein nitrogen adulteration, manufactured in NPA 'A-rated' cGMP facilities certified by UL Solutions.
Complete Supplement Facts Panel
Supplement Facts
Serving Size: 2 Veg Capsules
Servings Per Container: 60
| Description |
Amount per Serving |
% Daily Value |
| L-Tryptophan (Free-Form) |
1 g (1,000 mg) |
** |
|
** Daily Value not established.
|
Other Ingredients: Hypromellose (cellulose capsule), Rice Flour, Ascorbyl Palmitate and Stearic Acid (vegetable source).
Allergen Notice: Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Caution: For adults only. Consult physician if pregnant/nursing, taking medication (especially antidepressants such as SSRIs and MAOIs), or have a medical condition. May cause drowsiness. Do not use with alcoholic beverages or while operating heavy machinery. Keep out of reach of children.
Origin & Packaging: Natural color variation may occur in this product. Made and quality tested in the USA with globally sourced ingredients. Family owned since 1968. Store in a cool, dry place after opening. Vegetarian/Vegan. SKU 0167: This bottle is made from 100% PCR (post-consumer recycled) resin.
Curator's Note & Retail Heritage
Curated and shipped directly by VitaNet®, LLC, established in 1995 with our brick-and-mortar headquarters located at 887 Edison Street Northwest, Hartville, Ohio 44632. Bringing over 31 years of dedicated supplement curation and raw-material verification, we maintain direct distribution partnerships to guarantee genuine, factory-fresh products stored in climate-controlled conditions.
As a Better Business Bureau A+ accredited company, every order includes our unconditional 100% money-back guarantee with return shipping covered, even on opened bottles. For product assistance, contact our Ohio-based customer support team directly at (330) 877-8786.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Scientific References & Clinical Studies
-
Sutanto, C. N., Loh, W. W., & Kim, J. E., "The impact of tryptophan supplementation on sleep quality: a systematic review, meta-analysis, and meta-regression," Nutrition Reviews, 2022. PMID: 33942088.
-
Hartmann, E., "Effects of L-tryptophan on sleepiness and on sleep," Journal of Psychiatric Research, 1982. PMID: 6764927.
-
aan het Rot, M., Moskowitz, D. S., Pinard, G., & Young, S. N., "Social behaviour and mood in everyday life: the effects of tryptophan in quarrelsome individuals," Journal of Psychiatry & Neuroscience, 2006. PMID: 16862243.
-
Fernstrom, J. D., "Role of precursor availability in control of monoamine biosynthesis in brain," Physiological Reviews, 1983. PMID: 6132421.
Frequently Asked Questions
Can I open the vegetarian capsules and mix the powder into water or applesauce?
Yes. The two-piece hypromellose vegetable capsules pull apart smoothly. Free-form L-tryptophan is water-soluble and possesses a mild, faintly sweet taste with zero bitterness. You can stir the loose inner powder directly into cool water, tart cherry juice, or unsweetened applesauce without degrading potency or reducing biological absorption.
Why is L-Tryptophan best taken with a carbohydrate snack rather than protein?
Tryptophan competes with other large neutral amino acids to cross the blood-brain barrier [4]. When you eat protein-dense foods, your bloodstream fills with competing amino acids that crowd out tryptophan at brain transport gates. A small carbohydrate snack prompts a gentle insulin release that draws competing amino acids into muscle tissue, leaving an open pathway for tryptophan to enter the brain and synthesize serotonin [4].
How does free-form L-Tryptophan differ from taking direct 5-HTP supplements?
Direct 5-HTP enters the brain and converts automatically into serotonin without biological rate limits. In contrast, free-form L-tryptophan relies on a rate-limiting cellular enzyme called tryptophan hydroxylase [3, 4]. This checkpoint allows your body to synthesize exactly the amount of serotonin and nighttime melatonin it requires, preventing excessive neurotransmitter spikes and supporting sustained emotional balance.
Can I take NOW L-Tryptophan 500 mg during the daytime for mood support without feeling drowsy?
Yes, provided you adjust your timing. For daytime mood and stress resilience, take 1 capsule (500 mg) in the mid-to-late afternoon between meals. Daylight naturally suppresses the conversion of serotonin into melatonin, allowing the amino acid to support calm focus without triggering drowsiness. However, if you are particularly sensitive to relaxation effects, avoid driving or operating machinery after your initial dose [1, 2].
Is it safe to take L-Tryptophan if I am currently taking prescription antidepressant medications?
No. You must not combine supplemental L-tryptophan with prescription antidepressants, including Selective Serotonin Reuptake Inhibitors (SSRIs) or Monoamine Oxidase Inhibitors (MAOIs), without direct physician supervision. Because both increase synaptic serotonin levels, combining them creates a serious risk of serotonin syndrome, a potentially dangerous neurological condition. Always consult your prescribing doctor before starting any amino acid regimen.
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Click here for L-Tryptophan 500 mg from NOW
Size: 60 Vcaps
S.Retail: $ 21.99
40% OFF
$ 13.19
Product Overview & Quick Specs
Think of L-tryptophan like raw lumber your brain needs to build steady daytime mood and restorative nighttime sleep. NOW® L-Tryptophan 500 mg delivers pharmaceutical-grade, crystalline free-form amino acids (chemical formula: C11H12N2O2) in convenient vegetarian capsules [1, 3]. Each 2-capsule serving provides 1,000 mg of pure L-tryptophan to support healthy serotonin for emotional balance and evening melatonin for sound sleep [1, 2].
Quick Specs Snapshot
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Active Form & Potency: 1,000 mg (1 g) of pure Free-Form L-Tryptophan per 2-capsule serving (500 mg per single veg capsule).
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Primary Target: Central nervous system serotonin synthesis pathways and pineal gland nighttime melatonin conversion [1, 4].
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Supply & Value: 60 vegetarian capsules provide 30 full 2-capsule servings (a full 30-day supply at 1,000 mg, or 60 days at 500 mg daily).
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Purity & Dietary Status: Vegetarian/vegan formulation, non-GMO, allergen-free (no gluten, soy, dairy, or nuts), bottled in 100% PCR recycled resin.
Buyer's Guide & Form Comparison
Why the Free-Form Capsule Structure Matters
Think of dietary protein like a crowded commuter train. In whole foods like poultry or dairy, tryptophan is locked inside dense protein chains alongside competing amino acids. It must compete for intestinal doors and brain transport gates [4]. NOW® utilizes pure Free-Form L-Tryptophan. This unbound molecule enters the bloodstream rapidly without requiring extensive enzymatic breakdown.
Unlike direct 5-HTP supplements that force serotonin creation without restraint, free-form L-tryptophan respects your body's natural rate-limiting enzymes (tryptophan hydroxylase). Your brain converts exactly what it requires without neurotransmitter spikes [3, 4]. Furthermore, discount commodity big box store brands often skip expensive raw material testing, risking industrial contaminants. NOW® subjects every production lot to strict in-house laboratory screening to ensure zero Peak E or microbial impurities.
Is This Formula Right for You?
Best Choice For:
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Restless Sleepers: Adults seeking to fall asleep faster and reduce nighttime waking without morning grogginess [1, 2].
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Flexible Dosing Seekers: Individuals who want the convenience of taking 1 capsule (500 mg) for daytime calm or 2 capsules (1,000 mg) for sleep.
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Daily Stress & Mood Support: Individuals wanting to encourage emotional balance, patience, and positive social interaction [3].
Consider Another Option If:
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Taking Prescription Antidepressants: Anyone taking SSRIs or MAOIs must avoid supplemental L-tryptophan due to serotonin interactions.
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Bulk Powder Preference: Shoppers who prefer stirring unflavored loose powders into large bedtime drinks rather than swallowing capsules.
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Immediate Daytime Energy: Anyone seeking an active morning stimulant, as tryptophan promotes natural relaxation and calm.
Store Guarantee: Every purchase is backed by VitaNet®, LLC's 31-year reputation and unconditional 100% money-back guarantee (even on opened bottles), allowing customers to evaluate digestive tolerance risk-free.
How It Works in the Body
1. Crossing the Blood-Brain Barrier (LAT1 Transport)
Think of the blood-brain barrier like a guarded security turnstile. Amino acids must show a specific biological pass to enter brain tissue. Tryptophan shares this entrance with large neutral amino acids (the LAT1 transport system) [4]. When consumed away from heavy dietary proteins, free-form tryptophan clears the turnstile without competition. It enters brain tissue efficiently to begin neurotransmitter synthesis [4].
2. Synthesizing the Mood Messenger (Serotonin Production)
Think of brain cells like a precision assembly line. Inside neurons, an enzyme tool (tryptophan hydroxylase) converts L-tryptophan into intermediate 5-HTP [4]. A secondary enzyme (aromatic L-amino acid decarboxylase) quickly transforms 5-HTP into active serotonin (5-hydroxytryptamine) [3]. Serotonin acts as the body's primary conductor for emotional poise. It encourages positive mood, patience, and cooperative social interactions [3].
3. Regulating the Sleep Clock (Melatonin Conversion)
Think of your pineal gland like a natural light-sensitive dimmer switch. As night falls and light levels decline, specialized pineal enzymes convert serotonin into melatonin (N-acetyl-5-methoxytryptamine) [1, 2]. Melatonin signals your internal master clock that it is time for sleep. Clinical trials show that supplemental tryptophan significantly reduces sleep onset latency and decreases wakefulness after sleep onset [1, 2].
Daily Timing, Synergy & Realistic Timelines
Best Time to Take & Meal Pairings
Take 1 to 2 veg capsules daily on an empty stomach, or alongside a light carbohydrate snack. Think of carbohydrates like a cellular traffic escort. A small carbohydrate snack prompts a modest insulin release. Insulin pulls competing amino acids into muscle tissue, clearing an open lane for tryptophan to cross into the brain [4]. Avoid taking your capsules with high-protein meals or dairy shakes.
Daily Schedule Strategy
For restful nighttime sleep, swallow 2 capsules (1,000 mg) with 8 ounces of water (H2O) 30 to 60 minutes before bedtime [1, 2]. For daytime mood support, take 1 capsule (500 mg) in the mid-to-late afternoon between lunch and dinner on an empty stomach [3, 4].
Smart Pairings & Separation Rules
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Nutrient Synergies: Pairs well with Vitamin B-6 and Magnesium. These nutrients act as biological cofactors for enzymes that convert amino acids into active neurotransmitters [4].
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2-Hour Spacing Rule: Keep at least a 2-hour window between this supplement and high-protein foods, branched-chain amino acids (BCAAs), or protein shakes to avoid carrier competition [4].
What to Expect Over Time
Days 1–7: Initial cellular uptake. You experience a smoother evening transition into sleep, shorter time spent tossing and turning, and restful nighttime recovery [1, 2].
Weeks 3–4: Tissue saturation and baseline support. Steady precursor availability helps replenish serotonin reserves, supporting balanced daytime mood and consistent sleep architecture [1, 3].
Months 2–3+: Long-term maintenance. Cumulative neurochemical equilibrium promotes steady emotional resilience, positive daily outlook, and dependable circadian rhythm alignment [1, 3].
Physical Feel, Sensory Traits & Clean Ingredients
Pill Format & Ease of Use
NOW® L-Tryptophan 500 mg is encapsulated in standard size "0" two-piece vegetarian capsules. The smooth plant-cellulose shell becomes naturally slick with water, gliding down the throat effortlessly without sticking. For individuals who dislike swallowing pills, the two halves pull apart cleanly, allowing you to stir the mild inner powder directly into water or applesauce.
Natural Aroma, Taste & Color
When swallowed whole, the capsules are odorless and tasteless. If opened, the inner amino acid powder has a neutral scent and a faint, mild sweetness with zero bitter aftertaste. Natural capsule color ranges from off-white to ivory across production lots, reflecting unbleached raw materials with zero synthetic dyes.
Other Ingredients Explained
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Hypromellose (cellulose capsule): A clean, vegetarian capsule shell made from natural plant cellulose that dissolves quickly in stomach fluids.
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Rice Flour: A hypoallergenic, gluten-free natural grain powder used to evenly fill empty space so each capsule delivers the exact 500 mg dose.
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Ascorbyl Palmitate: A fat-soluble form of Vitamin C that acts as a natural antioxidant, protecting the delicate amino acid from oxidation.
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Stearic Acid (vegetable source): A plant-derived fatty acid that lubricates encapsulation machinery so powders flow cleanly without sticking.
Proper Storage & Packaging
Keep the lid tightly closed and store in a cool, dry place after opening. Protect the capsules from excessive heat, light, and humidity. This bottle is manufactured from 100% post-consumer recycled (PCR) resin, protecting light-sensitive amino acids from degradation while reducing virgin plastic waste.
Manufacturer Quality & Lab Testing Standards
Discount big box store brands frequently cut costs by purchasing low-grade amino acids from unverified brokers without in-house quality verification. These budget products risk unlisted fillers, active ingredient degradation, and heavy metal contamination. NOW® protects your health with rigorous testing in private ISO/IEC 17025:2017 accredited analytical facilities:
✓ Peak E & Microbial Purity Clearance
Every single production lot of NOW® L-Tryptophan is analyzed and certified free of Peak E, ethylidene-bis-tryptophan, and other toxic synthetic impurities. Finished lots undergo comprehensive culture tests to confirm the total absence of Salmonella spp., Escherichia coli, and Staphylococcus aureus.
✓ Heavy Metal Detection via ICP-MS
NOW tests every raw material batch using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). This instrument detects elemental contaminants down to parts-per-billion (ppb) levels, ensuring safety thresholds that beat strict California Proposition 65 benchmarks for lead, arsenic, cadmium, and mercury.
✓ Molecular Identity & Potency Verification via HPLC
Using High-Performance Liquid Chromatography (HPLC), NOW chemists verify the unique chemical fingerprint of free-form L-tryptophan. This guarantees that every capsule provides 100% of the declared active potency, free from non-protein nitrogen adulteration, manufactured in NPA 'A-rated' cGMP facilities certified by UL Solutions.
Complete Supplement Facts Panel
Supplement Facts
Serving Size: 2 Veg Capsules
Servings Per Container: 30
| Description |
Amount per Serving |
% Daily Value |
| L-Tryptophan (Free-Form) |
1 g (1,000 mg) |
** |
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** Daily Value not established.
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Other Ingredients: Hypromellose (cellulose capsule), Rice Flour, Ascorbyl Palmitate and Stearic Acid (vegetable source).
Allergen Notice: Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Caution: For adults only. Consult physician if pregnant/nursing, taking medication (especially antidepressants such as SSRIs and MAOIs), or have a medical condition. May cause drowsiness. Do not use with alcoholic beverages or while operating heavy machinery. Keep out of reach of children.
Origin & Packaging: Natural color variation may occur in this product. Made and quality tested in the USA with globally sourced ingredients. Family owned since 1968. Store in a cool, dry place after opening. Vegetarian/Vegan. SKU 0167: This bottle is made from 100% PCR (post-consumer recycled) resin.
Curator's Note & Retail Heritage
Curated and shipped directly by VitaNet®, LLC, established in 1995 with our brick-and-mortar headquarters located at 887 Edison Street Northwest, Hartville, Ohio 44632. Bringing over 31 years of dedicated supplement curation and raw-material verification, we maintain direct distribution partnerships to guarantee genuine, factory-fresh products stored in climate-controlled conditions.
As a Better Business Bureau A+ accredited company, every order includes our unconditional 100% money-back guarantee with return shipping covered, even on opened bottles. For product assistance, contact our Ohio-based customer support team directly at (330) 877-8786.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Scientific References & Clinical Studies
-
Sutanto, C. N., Loh, W. W., & Kim, J. E., "The impact of tryptophan supplementation on sleep quality: a systematic review, meta-analysis, and meta-regression," Nutrition Reviews, 2022. PMID: 33942088.
-
Hartmann, E., "Effects of L-tryptophan on sleepiness and on sleep," Journal of Psychiatric Research, 1982. PMID: 6764927.
-
aan het Rot, M., Moskowitz, D. S., Pinard, G., & Young, S. N., "Social behaviour and mood in everyday life: the effects of tryptophan in quarrelsome individuals," Journal of Psychiatry & Neuroscience, 2006. PMID: 16862243.
-
Fernstrom, J. D., "Role of precursor availability in control of monoamine biosynthesis in brain," Physiological Reviews, 1983. PMID: 6132421.
Frequently Asked Questions
Can I open the vegetarian capsules and mix the powder into water or applesauce?
Yes. The two-piece hypromellose vegetable capsules pull apart smoothly. Free-form L-tryptophan is water-soluble and possesses a mild, faintly sweet taste with zero bitterness. You can stir the loose inner powder directly into cool water, tart cherry juice, or unsweetened applesauce without degrading potency or reducing biological absorption.
Why is L-Tryptophan best taken with a carbohydrate snack rather than protein?
Tryptophan competes with other large neutral amino acids to cross the blood-brain barrier [4]. When you eat protein-dense foods, your bloodstream fills with competing amino acids that crowd out tryptophan at brain transport gates. A small carbohydrate snack prompts a gentle insulin release that draws competing amino acids into muscle tissue, leaving an open pathway for tryptophan to enter the brain and synthesize serotonin [4].
How does free-form L-Tryptophan differ from taking direct 5-HTP supplements?
Direct 5-HTP enters the brain and converts automatically into serotonin without biological rate limits. In contrast, free-form L-tryptophan relies on a rate-limiting cellular enzyme called tryptophan hydroxylase [3, 4]. This checkpoint allows your body to synthesize exactly the amount of serotonin and nighttime melatonin it requires, preventing excessive neurotransmitter spikes and supporting sustained emotional balance.
Can I take NOW L-Tryptophan 500 mg during the daytime for mood support without feeling drowsy?
Yes, provided you adjust your timing. For daytime mood and stress resilience, take 1 capsule (500 mg) in the mid-to-late afternoon between meals. Daylight naturally suppresses the conversion of serotonin into melatonin, allowing the amino acid to support calm focus without triggering drowsiness. However, if you are particularly sensitive to relaxation effects, avoid driving or operating machinery after your initial dose [1, 2].
Is it safe to take L-Tryptophan if I am currently taking prescription antidepressant medications?
No. You must not combine supplemental L-tryptophan with prescription antidepressants, including Selective Serotonin Reuptake Inhibitors (SSRIs) or Monoamine Oxidase Inhibitors (MAOIs), without direct physician supervision. Because both increase synaptic serotonin levels, combining them creates a serious risk of serotonin syndrome, a potentially dangerous neurological condition. Always consult your prescribing doctor before starting any amino acid regimen.
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Click here for L-Tryptophan 500 mg Serene Science Label from SOURCE NATURALS
Size: 60 capsules
S.Retail: $ 18.25
26% OFF
$ 13.50
Elevate Your Mood & Sleep Naturally: Experience the Magic of Source Naturals L-TryptophanA Glimpse into the HistoryL-Tryptophan, an amino acid discovered in the early 20th century, quickly gained attention not just for its nutritional significance but for its profound impact on human metabolism and mental health. Over the decades, it has been meticulously studied for its role as a precursor to serotonin and melatonin, making it a pivotal element in discussions around mood regulation, sleep, and overall psychological well-being. L-Tryptophan in the BodyIn the human body, L-Tryptophan performs the critical function of helping synthesize serotonin and melatonin. This synthesis is essential not only for mood regulation and the initiation of sleep but also for maintaining a harmonious balance between emotional and physical health. For customers keen on nurturing their mental wellness through natural means, Source Naturals L-Tryptophan offers a beacon of hope. By facilitating the production of serotonin and melatonin, it empowers individuals to harness the twin pillars of restful sleep and positive mood, naturally. This pure, high-quality supplement acts as a key to unlocking a more serene, fulfilling life. We understand the importance of mental health in the pursuit of overall well-being, which is why integrating Source Naturals L-Tryptophan into your daily regimen promises a step towards emotional balance and a brighter outlook on life. Additional Related Benefits- Promotes Serenity: By aiding in the synthesis of serotonin, it fosters relaxation and manages stress more effectively.
- Encourages Better Sleep: Contributes to the production of melatonin, ensuring a restful and healthy sleep cycle.
- Supports Positive Mood: Elevates mood levels naturally, helping you face each day with renewed optimism.
- Converts to Niacin: Demonstrates versatility by converting to niacin when required, supporting essential B vitamin levels and metabolic health.
- Exemplifies Purity and Quality: The commitment to rigorous testing guarantees a product of the highest purity and quality standards, ensuring the best for your mental and physical health.
By choosing Serene Science® L-Tryptophan, individuals gain access to a meticulously researched and quality-assured supplement that promises to support relaxation, improve sleep quality, and enhance emotional well-being, setting the foundation for a life lived with positivity and peace. Discover the path to your well-being that science and nature intertwine with Source Naturals L-Tryptophan. This pinnacle of purity and scientific endeavor is not just a supplement; it’s your ally in the pursuit of tranquility and rejuvenation. Take the step today towards a brighter tomorrow by securing your Source Naturals L-Tryptophan—because your peace of mind and body should not just be a goal, but a reality.
| Supplement Facts for Capsule Serving Size: 3 Capsules | | | Amount | %DV | | L-Tryptophan (25 mg naicin equivalents) | 1.5 g | | | | Suggested Use: 1 capsule three times daily, between meals and preferably with fruit juice. To support restful sleep, take an additional 3 capsules before bed. Other Ingredients: gelatin (capsule), magnesium stearate, silica, microcrystalline cellulose, and dibasic calcium phosphate. Warning: If you are pregnant, may become pregnant, breastfeeding, or are taking medications such as SSRIs or MAOIs, consult your health care professional before using this product. Do not use if either tamper-evident seal is broken or missing. Keep out of the reach of children. Store in a cool, dry place. Allergies: Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no preservatives, or artificial color, flavor or fragrance.
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Click here for L-Tryptophan 500mg from Natural Balance
Size: 60 Vegetarian Capsules
S.Retail: $ 37.09
40% OFF
$ 22.25
L-Tryptophan 500mg
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Description:
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New from Natural Balance – L-Tryptophan 500mg. this tryptophan is pure pharmaceutical-grade and manufactured by Ajinomoto. Tryptophan is an essential amino acid that acts as a precursor to serotonin, an important neurotransmitter for proper brain function.
This product contains TryptoPure tryptophan, from Ajinomoto, a world leader in amino acid development. TryptoPure conforms to the rigorous standards of both the United States and European Pharmacopoeias.
L-Tryptophan 500mg is back, look to Natural Balance for quality you can trust.
Each vegetarian capsule contains 500mg of TryptoPure (l-Tryptophan).
Other ingredients: Vegetable Cellulose Capsule, Magnesium Stearate and silica.
TryptoPure is a trademark of Ajinomoto Company Inc. USA.
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35662
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60ct 500mg
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Click here for L-Tryptophan 500mg from CALIFORNIA NATURAL VITAMINS
Size: 30 capsules
S.Retail: $ 16.29
31% OFF
$ 11.24
CALIFORNIA NATURAL VITAMINS L-Tryptophan 500 MG
Product Description
California Natural Vitamins L-Tryptophan has an important role in promoting relaxation, restful sleep and positive mood. L-tryptophan is an essential amino acid and hence cannot be synthesized by the body, but must be obtained from food or supplements.
Supplement Facts
Serving Size 1 Capsule
Amount Per Serving %Daily Value
L-Tryptophan 500 mg *
*Daily Value not established.
Other Ingredients
Cellulose, magnesium stearate (vegetable source) and silicon dioxide. Vegetarian capsule consists of hydroxypropylmethylcellulose.
Suggested Use
Take 1 capsule on an empty stomach 30 minutes before sleep with water or fruit juice, or as directed by your qualified healthcare consultant.
Warnings
Do not take this product if you are on any medications, especially antidepressants, or if you are pregnant or breastfeeding, consult your qualified healthcare professional. Do not take this product if you are taking any SSRI's (selective serotonin reuptake inhibitors). Keep out of the reach of children. |
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Click here for L-Tryptophan 500mg from ANABOL NATURALS
Size: 25 capsule
S.Retail: $ 11.95
19.95% OFF
$ 9.57
| L-Tryptophan 500mg - 25 Capsules by Anabol Naturals
Anabol Naturals’ Pharmaceutical Grade L-Tryptophan CMS provides the absolute purest quality free form L-Tryptophan, used worldwide by medical and holistic practitioners. Excessive degradation of L-Tryptophan from food sources by the body in the digestive process or by aging can preclude adequate production of serotonin in the brain. This in turn can result in poor sleep quality, stress, emotionalism (mood swings), weight gain and a loss of the feeling of well being. L-Tryptophan is a precursor to serotonin and is powerfully effective. |
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Click here for L-Tryptophan 500mg from Doctors Best
Size: 90 vCaps
S.Retail: $ 29.99
10% OFF
$ 26.99
| Supplement Facts:
Serving Size 1 Capsule Servings per container 90 servings
Ajinomoto L-Tryptophan ............ 500mg
Other Ingredients: Vegetable Capsules, Cellulose, Magnesium Stearate (vegetable source), Silicon dioxide.
Suggested Use: Take 1 or 2 Capsules daily, or as directed by a health practitioner. For optimum absorption, take separately from protein-containing foods and dietary supplements containing protein or amino acids.
Suitable for vegetarians
Best L-Tryptophan products contain Ajinomoto TryptoPure™. Tryptophan is an essential amino acid readily converted by the body to the neurotransmitter serotonin. Able to cross the blood-brain barrier, L-tryptophan is altered by enzymes to first form the intermediate amino acid 5-HTP and then serotonin. It is also the metabolic precursor to melatonin and to the B vitamin niacin. Supplementing the diet with pure L-tryptophan like TryptoPure™, found in Doctor’s Best L-Tryptophan products, can improve sleep and enhance mood, and may also be beneficial in reducing carbohydrate cravings. *
What is Ajinomoto TryptoPure™?
TryptoPure™ is pure, pharmaceutical-grade L-tryptophan produced by the world's leading maker of amino acids—Ajinomoto. The global leader in the research, production, and sales of amino acids, Ajinomoto was one of the first to make pharmaceutical-grade amino acids; they literally invented the process.
Ajinomoto TryptoPure™ is considered the purest, most trusted L-tryptophan available. It is manufactured via fermentation strictly from vegetable sources, not animal, and it is between 99% and 100% pure. The level of impurities in tryptophan from other makers can be much higher.
In fact, from 1989 to 2006 the FDA was so concerned about the quality of tryptophan coming into the U.S., that it instituted an import ban with one exception: Ajinomoto's TryptoPure™. In 1989, the importation of L-tryptophan was banned in the United States after cases of an autoimmune illness called eosinophilia-myalgia syndrome were traced to an improperly prepared batch of tryptophan. The FDA limited L-tryptophan availability to prescription drugs, infant formulas, and enteral feeding products. Because the FDA recognized the unsurpassed quality Ajinomoto’s TryptoPure™, it was excepted from the ban, but its use was limited to those few products. Today, it is available over-the-counter in Doctor’s Best L-Tryptophan products.
Promotes Normal, Healthy Restful Sleep*
Adequate sleep is a necessity for maintaining proper health. Sleeping well enhances our ability to function during the day. The body requires sleep as downtime to regenerate and repair essential bodily functions and allow us to feel refreshed. L-Tryptophan is a potent nutrient that has been found to enhance restful, peaceful sleep via a number of mechanisms. L-tryptophan is best known for its ability to decrease the amount of time it takes to fall asleep (George et al. 1989; Hartmann 1982). It has also been shown in studies to enhance total sleep time, decrease intermittent wakening, and decrease early morning wakefulness (Schneider-Helmert 1981; Wyatt et al. 1970), allowing the body to feel rejuvenated.
The clinical efficacy of L-tryptophan is due to its ability to support normal production of serotonin in the brain (Demisch et al. 1987b; Hartmann 1982) (Demisch et al. 1987a). Serotonin has been implicated in the regulation of sleep, mood, appetite, and temperature, among other roles that it plays in the body (Birdsall 1998). In a review article summarizing findings from over fifty studies conducted between 1970 and 1985, researchers concluded that L-tryptophan enhances overall sleep quality and also effectively provides a remedy for occasional sleeplessness. * It does this without dangerous side effects and without any feelings of next-day drowsiness. (Leiberman 1985)(Schneider-helmert 1986).
Enhances Mood and Sensations of Well-being*
Clinical studies show that L-tryptophan supplementation can positively affect mood and emotional well-being. A randomized, double blind, placebo-controlled trial of 115 individuals found that the administration of L-tryptophan was significantly more effective than placebo for enhancing mood and affect (Thomson J et al. 1982). The subjects took 1 gram of L-tryptophan or an identical placebo capsule three times per day for 12 weeks. Mood and affect were assessed using a standardized, clinically recognized rating scale. Scores in the group supplementing with L-tryptophan were significantly better than placebo at the end of the trial period, indicating L-tryptophan’s success at supporting healthy mood.
Further studies suggest that in healthy individuals, L-tryptophan has positive effects on mood, behavior, and emotional processing. For example, in a recent study of healthy females with normal moods and no history of depression, L-tryptophan supplementation alters the processing and perception of emotional stimuli towards a more positive bias. Supplementation with one gram three times per day caused an increase in happy facial expressions, a decrease in negative and disgusted facial expressions, and a decrease in the attention paid to negative words (Murphy et al. 2006). A second study conducted in 2006 with a double blind crossover design indicated that the same dose of L-tryptophan (1 gram three times per day) significantly decreased quarrelsome and aggressive behaviors while enhancing agreeable behaviors in everyday social interactions. In this study, participants reported more positive and less negative emotions and rated their interactions as more pleasant (aan het Rot et al. 2006).
A number of other studies point to the ability of L-tryptophan supplementation to balance mood. A study published in 1990 suggested that individuals with seasonal variations in mood responded well to supplementation with L-tryptophan (McGrath et al. 1990). Furthermore, compared to standard light therapy, the mood enhancement associated with L-tryptophan supplementation lasts longer after discontinuation than the effects seen after stopping light therapy (Ghadirian et al. 1998).
An additional double blind placebo-controlled study found that two grams of L-tryptophan administered three times a day, from the day of ovulation to the third day of menstruation (the luteal phase) in healthy women, significantly relieved the most prominent mood symptoms associated with PMS. After three months of use, women taking L-tryptophan experienced statistically significant control of extreme mood swings, sadness, irritability, and tension. It also improved their perceived quality of life (Steinberg et al. 1999).
Decreased Carbohydrate Cravings to Support Weight Management Efforts*
L-tryptophan may play a supportive role in helping individuals who are currently involved in weight management programs and diets by helping to reduce carbohydrate cravings. During dieting, serotonin levels drop dramatically. Serotonin plays a role in controlling appetite, and eating carbohydrate-rich foods increases serotonin levels in the brain. This may explain carbohydrate cravings and resultant binge eating in some dieters. While no human trials have examined L-tryptophan supplementation directly, a number of clinical trials have used supplemental 5-HTP, the amino acid produced in the body from L-tryptophan. Results of these trials have shown decreases in overall food intake and a subsequent reduction in weight in individuals taking 5-HTP. (Birdsall, 1998). The majority (75%) of the decreased food intake was from carbohydrates, suggesting decreased cravings for carbohydrates in individuals on 5-HTP (Cangiano et al. 1991). It is likely that L-tryptophan supplementation would have similar effects.
Safety
Suggested Adult Use: Take 1 or 2 capsules daily. For optimum absorption, take separately from protein-containing foods and dietary supplements containing protein or amino acids.
Uncontaminated L-tryptophan has a thirty-year history of safety and absence of adverse effects at levels commonly consumed by humans. When administered in abnormally high dosages of 7 grams (for a 150 pound human) per day, potential side effects include gastric irritation, vomiting, and head twitching (2006). Use during pregnancy or lactation has not been studied as of yet and is, therefore, not recommended. L-tryptophan should not be used by individuals taking antidepressant drugs without close medical supervision.
Does Not Contain: milk, egg, wheat, corn, sugar, sweeteners, starch, salt, or preservatives.
Scientific References
1. 2006. L-Tryptophan. Monograph. Altern Med Rev 11: 52-6.
2. aan het Rot, M., Moskowitz, D. S., Pinard, G. and Young, S. N. 2006. Social behaviour and mood in everyday life: the effects of tryptophan in quarrelsome individuals. J Psychiatry Neurosci 31: 253-62.
3. Birdsall, T. C. 1998. 5-Hydroxytryptophan: a clinically-effective serotonin precursor. Alternative Medicine Review 3: 271-280.
4. Cangiano, C., Ceci, F., Cairella, M., Cascino, A., Del Ben, M., Laviano, A., Muscaritoli, M. and Rossi-Fanelli, F. 1991. Effects of 5-hydroxytryptophan on eating behavior and adherence to dietary prescriptions in obese adult subjects. Adv Exp Biol Med 294 ("Kynurenine and Serotonin Pathways"): 591-593.
5. Demisch, K., Bauer, J. and Georgi, K. 1987a. Treatment of severe chronic insomnia with L-tryptophan and varying sleeping times. Pharmacopsychiatry 20: 245-248.
6. Demisch, K., Bauer, J., Georgi, K. and Demisch, L. 1987b. Treatment of severe chronic insomnia with L-tryptophan: results of a double-blind cross-over study. Pharmacopsychiatry 20: 242-244.
7. George, C. F., Millar, T. W., Hanly, P. J. and Kryger, M. H. 1989. The effect of L-tryptophan on daytime sleep latency in normals: correlation with blood levels. Sleep 12: 345-53.
8. Ghadirian, A. M., Murphy, B. E. and Gendron, M. J. 1998. Efficacy of light versus tryptophan therapy in seasonal affective disorder. J Affect Disord 50: 23-7.
9. Hartmann, E. 1982. Effects of L-tryptophan on sleepiness and on sleep. J Psychiatr Res 17: 107-13.
10. McGrath, R. E., Buckwald, B. and Resnick, E. V. 1990. The effect of L-tryptophan on seasonal affective disorder. J Clin Psychiatry 51: 162-3.
11. Murphy, S. E., Longhitano, C., Ayres, R. E., Cowen, P. J. and Harmer, C. J. 2006. Tryptophan supplementation induces a positive bias in the processing of emotional material in healthy female volunteers. Psychopharmacology (Berl) 187: 121-30.
12. Schneider-Helmert, D. 1981. Interval therapy with L-tryptophan in severe chronic insomniacs. A predictive laboratory study. International Pharmacopsychiatry 16: 162-173.
13. Steinberg, S., Annable, L., Young, S. N. and Liyanage, N. 1999. A placebo-controlled clinical trial of L-tryptophan in premenstrual dysphoria. Biol Psychiatry 45: 313-20.
14. Wyatt, R. J., Engelman, K., Kupfer, D. J., Fram, D. H., Sjoerdsma, A. and Snyder, F. 1970. Effects of L-tryptophan (a natural sedative) on human sleep. Lancet 2: 842-846. |
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Unlock Restful Nights: How Source Naturals L-Tryptophan Fosters Deep, Healing SleepThe History of L-TryptophanL-Tryptophan, an essential amino acid, has played a pivotal role in nutritional science and wellness for decades. Unlike non-essential amino acids, the human body cannot synthesize L-Tryptophan internally; it must be obtained through diet or supplementation. Historically, its importance was underscored in the mid-20th century, as researchers began to uncover its critical role in the synthesis of key neurotransmitters, including serotonin and melatonin. Its impact on mood regulation, sleep cycles, and general well-being has since made L-Tryptophan a focal point of both scientific study and holistic health approaches. What L-Tryptophan Does in the BodyIn the human body, L-Tryptophan serves as a precursor to serotonin, a neurotransmitter that plays a crucial role in mood regulation, and melatonin, which governs sleep-wake cycles. By supporting the synthesis of these hormones, L-Tryptophan aids in promoting relaxation, enhancing overall mood, and fostering restful sleep. For customers in pursuit of natural ways to support mood, relaxation, and sleep, Source Naturals L-Tryptophan presents a compelling solution. This essential amino acid not only contributes to the synthesis of mood-regulating hormones but also offers a base for the body's production of melatonin, facilitating a natural sleep cycle. Given its purity and consistent quality testing, Source Naturals L-Tryptophan stands out as a trustworthy choice for individuals aiming to enhance their well-being through natural, nutritional means. Additional Related Benefits- Promotes Positive Mood: By aiding serotonin production, L-Tryptophan can help elevate your mood, providing a sense of calm and well-being.
- Supports Restful Sleep: It plays a critical role in the production of melatonin, the hormone responsible for regulating sleep patterns, thereby assisting in achieving restful sleep.
- Strengthens Immune System: L-Tryptophan is involved in the synthesis of kynurenines, which regulate immune function, bolstering the body's ability to fight off illnesses.
- Aids in Digestive Health: It can convert to niacin in the body, essential for a healthy digestive system and the metabolism of food.
- Enhances Circulation and Nervous System Health: The conversion to niacin also supports circulation and maintains a healthy nervous system, contributing to overall physiological well-being.
L-Tryptophan in Supporting Mood, Relaxation, and SleepL-Tryptophan stands as a critical building block for the body's synthesis of serotonin and melatonin, two hormones that are integral to mood regulation, relaxation, and sleep. Its unique ability to cross the blood-brain barrier allows it to effectively influence neurotransmitter activity, thereby supporting a balanced emotional state and promoting healthy sleep patterns. Unlock the key to enhanced well-being with Source Naturals L-Tryptophan. Whether you're seeking to elevate your mood, find tranquility in your day, or enjoy restorative sleep, L-Tryptophan serves as your gateway to a balanced and enriched life. Don't miss out on the opportunity to transform your health—take the first step towards a more serene and joyful existence by trying L-Tryptophan today. Act now to begin your journey toward optimal wellness.
| Supplement Facts for Tablet Serving Size: 3 Tablets | | | Amount | %DV | | Calcium (as dibasic calcium phosphate) | 48 mg | 4% | | L-Tryptophan (25 mg niacin equivalents) | 1.5 g | | | | Suggested Use: 1 tablet three times daily, between meals and preferably with fruit juice. To support restful sleep, take 3 tablets before bed. Other Ingredients: dibasic calcium phosphate, stearic acid, modified cellulose gum, and silica. Warning: If you are pregnant, may become pregnant, breastfeeding, may become pregnant, or are taking medications such as SSRIs or MAOIs, consult your health care professional before using this product. Do not use if either tamper resistant seal is broken or missing. Keep out of the reach of children. Store in a cool, dry place. Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. Keep this product out of the reach of children. In case of accidental overdose, call a doctor or poison control center immediately. Allergies: Suitable for vegetarians and contains no yeast, dairy, egg, gluten, soy or wheat. Contains no preservatives, or artificial color, flavor or fragrance.
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Source Naturals L-Tryptophan: Your Natural Ally in Mood, Sleep, and WellnessThe History of L-TryptophanL-Tryptophan's significance in nutritional science and holistic wellness emerged in earnest during the mid-20th century. Recognized as an essential amino acid, it spotlighted the intricate relationship between diet, neurotransmitter synthesis, and overall health. Pioneering studies underscored its role in producing serotonin and melatonin, hormones crucial for mood and sleep, propelling L-Tryptophan to prominence in discussions about natural health solutions. What L-Tryptophan Does in the BodyIn the human body, L-Tryptophan acts as a fundamental precursor to serotonin and melatonin, neurotransmitters vital for mood stabilization and sleep regulation. Its capacity to positively influence these areas marks it as an essential component of emotional well-being and circadian rhythm management. For customers venturing into the realm of natural supplements to enhance mood, relaxation, and sleep, Source Naturals L-Tryptophan represents a beacon of hope. Its scientifically backed role in the synthesis of serotonin and melatonin offers a trusted, natural pathway to improved mental and emotional health. With its excellent purity and assured quality, Source Naturals L-Tryptophan stands as the preferred choice for individuals committed to nurturing their well-being holistically. Encouraging a deeper, more restorative sleep and fostering a balanced mood, this supplement is a versatile ally against the challenges of stress and restlessness. Exploring the benefits of L-Tryptophan could very well be the turning point toward a more tranquil and fulfilling life. Additional Related Benefits- Fosters Emotional Well-Being: By enhancing serotonin production, it contributes significantly to elevating mood and instilling a sense of calm.
- Ensures Quality Slumber: Critical in melatonin synthesis, it helps regulate sleep patterns for restorative rest.
- Bolsters Immune Function: Acting as a precursor to kynurenines, it plays a strategic role in regulating immune response.
- Supports Digestive Health: Its conversion to niacin is pivotal for maintaining a healthy digestive system, food metabolism, and digestive acid production.
- Promotes Nervous System and Circulatory Health: Niacin also aids in maintaining healthy circulation and nerve function, encapsulating L-Tryptophan's multifaceted benefits to physical and mental health.
L-Tryptophan: A Key Ingredient for Mood, Relaxation, and SleepL-Tryptophan is a vital precursor to essential neurotransmitters serotonin and melatonin, playing a significant role in mood regulation, relaxation, and sleep cycle management. Its unique ability to cross the blood-brain barrier distinguishes it as a potent natural supplement for enhancing emotional well-being and ensuring restful nights. By providing the foundational support for neurotransmitter synthesis, L-Tryptophan lays the groundwork for a serene and balanced life. Unlock the full potential of your emotional and physical well-being with Source Naturals L-Tryptophan. Bring harmony to your mind and body, experience the tranquility of enhanced mood and welcoming restful sleep into your nightly routine. Take action today to elevate your quality of life. Order now and join the multitude of satisfied individuals who have transformed their lives with L-Tryptophan. Begin your journey to optimal wellness and live each day to its fullest.
| Supplement Facts for Tablet Serving Size: 3 Tablets | | | Amount | %DV | | Calcium (as dibasic calcium phosphate) | 48 mg | 4% | | L-Tryptophan (25 mg niacin equivalents) | 1.5 g | | | | Suggested Use: 1 tablet three times daily, between meals and preferably with fruit juice. To support restful sleep, take 3 tablets before bed. Other Ingredients: dibasic calcium phosphate, stearic acid, modified cellulose gum, and silica. Warning: If you are pregnant, may become pregnant, breastfeeding, may become pregnant, or are taking medications such as SSRIs or MAOIs, consult your health care professional before using this product. Do not use if either tamper resistant seal is broken or missing. Keep out of the reach of children. Store in a cool, dry place. Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. Keep this product out of the reach of children. In case of accidental overdose, call a doctor or poison control center immediately. Allergies: Suitable for vegetarians and contains no yeast, dairy, egg, gluten, soy or wheat. Contains no preservatives, or artificial color, flavor or fragrance.
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Source Naturals L-Tryptophan 500mg: Your Pathway to Peaceful Nights and Joyful DaysThe History of L-TryptophanDiscovered in the late 19th century, L-Tryptophan’s significant contributions to mental health and sleep regulation were not fully appreciated until the 20th century. Its role as a critical precursor to serotonin and melatonin highlighted its importance in mood regulation, stress response, and sleep/wake cycles, shifting it into the spotlight for natural wellness remedies. What L-Tryptophan Does in the BodyIn the human body, L-Tryptophan serves as a crucial building block for the production of serotonin and melatonin, neurotransmitters that regulate mood and sleep. Its ability to influence these key factors makes L-Tryptophan essential for maintaining emotional balance, stress management, and healthy sleep patterns. For individuals seeking a natural solution to enhance mood, relaxation, and sleep, Source Naturals L-Tryptophan 500mg offers a scientifically supported option. This supplement provides an effective way to naturally increase serotonin and melatonin levels, facilitating a calm, content state of mind and encouraging restful sleep. Adopting L-Tryptophan into one's wellness regimen promises to elevate one's overall quality of life, helping to manage daily stressors with more resilience and enjoy the profound benefits of improved mental and emotional well-being. Additional Related Benefits of L-Tryptophan- Optimizes Emotional Equilibrium: Facilitates an uplifted, stable mood by encouraging serotonin production.
- Promotes Quality Sleep: Assists in the synthesis of melatonin, contributing to regular, restorative sleep cycles.
- Enhances Immune Functionality: By serving as a precursor for kynurenines, it supports effective immune regulation.
- Improves Digestive Health: The conversion to niacin ensures a robust digestive system and optimizes food metabolism.
- Boosts Circulatory and Nervous System Health: Niacin from L-Tryptophan aids in sustaining healthy circulation and nerve function, underlining its comprehensive benefits.
L-Tryptophan: A pivotal amino acid, L-Tryptophan is the keystone in the production of serotonin and melatonin, the neurotransmitters that are fundamental to elevating mood, promoting relaxation, and ensuring restful sleep. It stands as a natural, effective means to support emotional balance and a healthy sleep cycle, making it an indispensable supplement for those aiming to enhance their mental wellness and relaxation. Are you ready to turn the page and start a new chapter of unparalleled peace and restful nights? Source Naturals L-Tryptophan 500mg is your key to unlocking a more relaxed, joyous life. It's time to experience the profound impact of improved mood and sleep on your overall well-being. Don't wait another night tossing and turning. Act now and bring the serenity and restful sleep you deserve into your life with Source Naturals L-Tryptophan 500mg. Order yours today!
| Supplement Facts for Tablet Serving Size: 3 Tablets | | | Amount | %DV | | Calcium (as dibasic calcium phosphate) | 48 mg | 4% | | L-Tryptophan (25 mg niacin equivalents) | 1.5 g | | | | Suggested Use: 1 tablet three times daily, between meals and preferably with fruit juice. To support restful sleep, take 3 tablets before bed. Other Ingredients: dibasic calcium phosphate, stearic acid, modified cellulose gum, and silica. Warning: If you are pregnant, may become pregnant, breastfeeding, may become pregnant, or are taking medications such as SSRIs or MAOIs, consult your health care professional before using this product. Do not use if either tamper resistant seal is broken or missing. Keep out of the reach of children. Store in a cool, dry place. Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. Keep this product out of the reach of children. In case of accidental overdose, call a doctor or poison control center immediately. Allergies: Suitable for vegetarians and contains no yeast, dairy, egg, gluten, soy or wheat. Contains no preservatives, or artificial color, flavor or fragrance.
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Click here for L-Tryptophan 500mg from SOURCE NATURALS
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From Restlessness to Relaxation: Discover Source Naturals L-Tryptophan’s Natural PowerThe History of L-TryptophanL-Tryptophan is an essential amino acid discovered in the early 20th century, recognized for its pivotal role in human nutrition and wellness. Essential to the human diet, it has long been studied for its ability to enhance mood, support relaxation, and promote healthy sleep patterns. Over the years, L-Tryptophan has gained prominence in the realm of dietary supplements, heralded for its natural efficacy in boosting serotonin and melatonin levels in the brain, thus influencing emotional well-being and sleep. What L-Tryptophan Does in the Body?In the human body, L-Tryptophan serves as a key precursor to serotonin and melatonin, crucial hormones for mood regulation and sleep. This relationship helps articulate why L-Tryptophan supplementation can be an effective approach to improving relaxation, uplifting mood, and fostering better sleep quality. For those seeking natural solutions to support mood, relaxation, and sleep, Source Naturals L-Tryptophan 500mg presents an ideal solution. Through its pivotal role in serotonin and melatonin synthesis, L-Tryptophan emphasizes a holistic approach to well-being. Imagine seamlessly transitioning into a state of relaxation after a long day, or gently drifting into restful sleep, and waking up feeling rejuvenated. This is the tranquil experience L-Tryptophan aims to offer, making it a fitting companion for anyone looking to enhance their mental, emotional, and sleep health naturally. Additional Related Benefits- Promotes Positive Mood: By supporting serotonin production, it aids in uplifting spirits and stabilizing mood.
- Facilitates Restful Sleep: Enhances overall sleep quality by contributing to healthy melatonin levels.
- Supports Immune Function: Its role in the synthesis of kynurenines helps regulate the body’s immune response.
- Converts to Niacin: Supports healthy circulation, nervous system, metabolism, and digestive health.
- High-Quality Assurance: Source Naturals L-Tryptophan is acclaimed for its purity and undergoes rigorous testing to meet superior quality standards.
L-Tryptophan is more than just an amino acid; it's your gateway to improved wellness. Acting as a crucial building block for serotonin and melatonin, L-Tryptophan directly influences your mood, relaxation levels, and sleep quality. Its natural capacity to elevate serotonin production not only uplifts your spirits but also promotes a calmness that is essential for a restful night's sleep. With Source Naturals L-Tryptophan 500mg, you're not just purchasing a supplement; you're investing in your mental and emotional well-being. Ready to transform your sleep and elevate your mood naturally? Take the first step towards a more tranquil, joyful life with Source Naturals L-Tryptophan 500mg. Don't just dream of better nights and brighter days; make them a reality. Click 'Add to Cart' to purchase your pathway to peace and positivity.
| Supplement Facts for Capsule Serving Size: 3 Capsules | | | Amount | %DV | | L-Tryptophan (25 mg naicin equivalents) | 1.5 g | | | | Suggested Use: 1 capsule three times daily, between meals and preferably with fruit juice. To support restful sleep, take an additional 3 capsules before bed. Other Ingredients: gelatin (capsule), magnesium stearate, silica, microcrystalline cellulose, and dibasic calcium phosphate. Warning: If you are pregnant, may become pregnant, breastfeeding, or are taking medications such as SSRIs or MAOIs consult your health care professional before using this product. Do not use if either tamper-evident seal is broken or missing. Keep out of the reach of children. Store in a cool, dry place. Allergies: Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no preservatives, or artificial color, flavor or fragrance.
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Size: 90 Capsules
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Transform Your Nights & Days: L-Tryptophan for Ultimate Relaxation and Well-BeingThe History of L-TryptophanL-Tryptophan has a storied past, tracing back to its early discovery as an essential amino acid crucial for human health. Its significance was further illuminated when scientists revealed its vital role in the synthesis of serotonin and melatonin, two hormones pivotal to regulating mood and sleep. This discovery underscored L-Tryptophan's potential as a natural aid for emotional balance and sleep quality, positioning it as a key ingredient in the pursuit of holistic wellness. What Does L-Tryptophan Do in the Body?In the human body, L-Tryptophan acts as a precursor to serotonin, a neurotransmitter that regulates mood, and melatonin, which controls sleep cycles. This essential amino acid thus plays a critical role in promoting emotional well-being and restful sleep, making it an invaluable resource for those seeking natural ways to foster balance and relaxation. Imagine a natural solution that gently ushers you into a state of relaxation, soothes your mind, and cradles you into deep, restorative sleep night after night. Source Naturals L-Tryptophan 500mg is that solution. Crafted from the finest ingredients, it stands as a beacon of hope for those seeking to enhance their mood, find serenity amidst the daily bustle, and enjoy the profound benefits of quality sleep. This powerful supplement not only supports your emotional and physical well-being but also aligns with the rhythms of your body to promote a balanced, joyful life. Don't just dream of better rest and happier days; make them your reality with L-Tryptophan 500mg. Additional Related Benefits- Promotes Relaxation and Positive Mood: Enhances serotonin production, easing stress and uplifting spirits.
- Encourages Deep, Restorative Sleep: Supports melatonin synthesis for improved sleep quality.
- Supports Immune Function: Acts as a precursor for kynurenines, key in regulating immunity.
- Aids in Circulatory and Nervous System Health: Converts to niacin, improving blood flow and supporting nervous system functions.
- Enhances Digestive Wellness: Niacin aids in producing digestive acids for improved gut health.
- Exceptional Quality and Purity: Rigorously tested to meet the highest standards, ensuring you receive the best nature has to offer.
Unveiling the Magic of L-TryptophanL-Tryptophan is not just any amino acid; it's a key to unlocking a balanced and joyful life. By serving as a precursor to serotonin, it enhances your mood, making the stresses of daily life feel like distant memories. Its critical role in synthesizing melatonin ensures that every night can be filled with restful, deep sleep, allowing you to wake up refreshed and full of vitality. It's the gentle nudge your body needs to find its natural rhythm of relaxation and rejuvenation. Your Path to a Better Tomorrow Begins Today!Say goodbye to the tossing and turning of sleepless nights and the gray clouds of uninvited stress. Source Naturals L-Tryptophan 500mg is your golden ticket to a life filled with serene days and tranquil nights. Imagine easing into each day with a rejuvenated spirit and closing each night with a peaceful descent into dreamland. This isn't just a supplement; it's a lifestyle change — a promise of well-being you make to yourself. With Source Naturals L-Tryptophan 500mg, you're not just purchasing a bottle of pills; you're stepping closer to the balanced, fulfilled life you deserve. Why wait for a brighter tomorrow when you can begin today? Take action now, add L-Tryptophan 500mg to your cart, and turn the page to the next chapter of your life. A world of serene relaxation, uplifting moods, and blissful nights awaits.
| Supplement Facts for Capsule Serving Size: 3 Capsules | | | Amount | %DV | | L-Tryptophan (25 mg naicin equivalents) | 1.5 g | | | | Suggested Use: 1 capsule three times daily, between meals and preferably with fruit juice. To support restful sleep, take an additional 3 capsules before bed. Other Ingredients: gelatin (capsule), magnesium stearate, silica, microcrystalline cellulose, and dibasic calcium phosphate. Warning: If you are pregnant, may become pregnant, breastfeeding, or are taking medications such as SSRIs or MAOIs consult your health care professional before using this product. Do not use if either tamper-evident seal is broken or missing. Keep out of the reach of children. Store in a cool, dry place. Allergies: Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no preservatives, or artificial color, flavor or fragrance.
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Click here for L-Tryptophan 500mg from SOURCE NATURALS
Size: 60 caps
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Verified Purity • Item #SN1984 • UPC 021078019848
Source Naturals L-Tryptophan 500mg (60 Capsules)
Reclaim calm days and restful nights with pure Source Naturals L-Tryptophan 500mg. This essential amino acid serves as your body’s natural building block for serotonin—the brain chemical responsible for a sunny mood—and melatonin, the master hormone that tells your body when it is time to sleep deeply.
Medical & Dietary Review: Formulated according to strict cGMP pharmaceutical standards. L-Tryptophan is an essential nutrient that the human body cannot produce on its own; it must be obtained through balanced nutrition or targeted supplementation.
✓
Natural Sleep Aid: Encourages sleep latency reduction without morning grogginess.
✓
Balanced Mood: Serves as the immediate biological precursor to serotonin.
✓
Cellular Energy: Converts safely into niacin (Vitamin B3) and vital kynurenines.
✓
Rigorous Testing: Laboratory verified for absolute purity and safety.
How L-Tryptophan 500mg Works in the Body: The Layman’s Guide
Think of amino acids as individual LEGO bricks. When you eat proteins like eggs, poultry, or legumes, your body breaks them down into amino acids to build tissues, enzymes, and neurochemicals. L-Tryptophan is unique: it is the rarest amino acid in the typical Western diet, yet it controls two of your most important neurological switches: your mood and your sleep-wake cycle.
The 3-Step Serotonin & Melatonin Cascade
- Absorption & Brain Entry: Once ingested, L-Tryptophan travels through the bloodstream and passes through the blood-brain barrier.
- Serotonin Synthesis: Inside brain cells, an enzyme called tryptophan hydroxylase converts L-Tryptophan first into 5-HTP, which is then swiftly transformed into serotonin. Serotonin is your body's "feel-good" messenger that regulates contentment, tranquility, and emotional resilience.
- Melatonin Conversion at Sunset: As twilight arrives and ambient light fades, your brain's pineal gland takes that very same serotonin and converts it into melatonin—the hormone that signals to every cell in your body that it is time for deep, restorative slumber.
Beyond brain chemistry, approximately 95% of your body's L-Tryptophan operates along the kynurenine pathway. This pathway synthesizes nicotinamide adenine dinucleotide (NAD+) and niacin (Vitamin B3), providing mitochondrial energy for cellular repair and supporting a balanced immune response.
The Fruit Juice Secret: Mastering Blood-Brain Barrier Transport
If you look at the label of Source Naturals L-Tryptophan 500mg, you will notice a specific instruction: "take between meals and preferably with fruit juice." Why fruit juice?
To get from your bloodstream into your brain, nutrients must pass through a biological checkpoint called the blood-brain barrier. Amino acids enter this checkpoint using a single carrier vehicle known as the LAT1 transporter. Think of the LAT1 transporter like an express bus with limited seats.
The "Bus Seat" Analogy
L-Tryptophan is a relatively small and fragile amino acid. When you eat a heavy protein meal (like a steak), huge amounts of competing Large Neutral Amino Acids (leucine, isoleucine, and valine) crowd the bus stop and take all the seats. As a result, very little tryptophan reaches the brain.
When you take L-Tryptophan with a small glass of fruit juice (simple carbohydrates), your body releases a moderate, gentle pulse of insulin. Insulin acts like a shuttle conductor: it pulls the competing branched-chain amino acids out of the bloodstream and tucks them away into your muscle cells. This leaves the highway completely clear for L-Tryptophan to cross the blood-brain barrier smoothly and begin manufacturing serotonin and melatonin.
Scientific Reference: Fernstrom, J. D., & Wurtman, R. J. (1971). Brain serotonin content: physiological dependence on plasma tryptophan levels. Science, 173(3992), 149-152. PMID: 5581909.
What the Clinical Science Demonstrates: Peer-Reviewed Efficacy
Unlike synthetic sleep sedatives that force the central nervous system into unnatural slumber, nutritional supplementation with L-Tryptophan works harmoniously with your natural circadian rhythm. Decades of clinical sleep research have validated its therapeutic benefits:
1. Faster Sleep Onset Without Distorting Sleep Architecture
In landmark double-blind clinical trials, dosages between 500mg and 1,500mg of L-Tryptophan significantly reduced sleep latency (the time it takes to fall asleep) in individuals experiencing mild sleep disturbances. Crucially, polysomnography (brain wave monitoring) confirmed that L-Tryptophan does not suppress REM sleep or deep delta-wave sleep, allowing patients to wake feeling clear-headed rather than intoxicated.
Citation: Hartmann, E., & Spinweber, C. L. (1979). Sleep induced by L-tryptophan. Effect of dosages within the normal dietary intake. J Nerv Ment Dis, 167(8), 497-499. PMID: 469515.
2. Long-Term Sleep Quality & No Morning Hangover
Studies evaluating chronic sleep-onset difficulties revealed that continuous nightly administration produced steady, late-appearing reductions in sleep latency. Subjects maintained sharp daytime psychomotor performance and normal daytime arousal thresholds, avoiding the cognitive blunting often associated with pharmaceutical hypnotics.
Citation: Spinweber, C. L. (1986). L-tryptophan administered to chronic sleep-onset insomniacs: late-appearing reduction of sleep latency. Psychopharmacology (Berl), 90(2), 151-155. PMID: 3097693.
3. Emotional Equilibrium and Stress Regulation
Research published in neurobiology journals indicates that maintaining optimal dietary tryptophan availability directly correlates with social cooperativeness, positive mood perception, and reduced irritability under stress.
Citation: Young, S. N. (2007). How to increase serotonin in the human brain without drugs. Journal of Psychiatry & Neuroscience, 32(6), 394–399. PMID: 18043762.
L-Tryptophan vs. 5-HTP: Which Should You Take?
Many shoppers ask whether they should purchase L-Tryptophan 500mg or 5-HTP (5-Hydroxytryptophan). While both molecules belong to the same biological pathway, they function differently in your body:
| Attribute |
L-Tryptophan 500mg |
5-HTP |
| Metabolic Control |
Regulated: Your brain converts only what it requires via rate-limited enzymes. |
Unregulated: Bypasses the rate-limiting enzyme; converts directly to serotonin. |
| Peripheral Effects |
Minimal peripheral spillover; gentle on digestion. |
Can convert to serotonin in the gut, occasionally causing nausea or cramping. |
| Versatility |
Builds serotonin, melatonin, niacin (B3), NAD+, and vital structural proteins. |
Dedicated exclusively to serotonin and melatonin production. |
| Ideal Use Profile |
Long-term nightly sleep support, steady daytime emotional balance, and comprehensive wellness. |
Short-term, rapid mood elevation and acute appetite moderation. |
The Expert Takeaway: If you prefer a gentle, physiologically controlled supplement that your brain can regulate without flooding your peripheral nervous system, L-Tryptophan 500mg provides the most balanced and sustainable approach.
Complete Supplement Facts & Ingredient Transparency
Source Naturals utilizes pharmaceutical-grade, pure crystalline L-Tryptophan, rigorously tested using high-performance liquid chromatography (HPLC) to guarantee zero contaminants.
Supplement Facts
Serving Size: 3 Capsules
Servings Per Container: 20 (60 Capsules Total)
| Amount Per Serving |
% Daily Value |
| L-Tryptophan (yielding 25 mg niacin equivalents) |
1.5 g (1,500 mg)† |
| † Daily Value (DV) not established. (Provides 500mg pure L-Tryptophan per individual capsule). |
Other Ingredients:
Gelatin (capsule), magnesium stearate, silica, microcrystalline cellulose, and dibasic calcium phosphate.
Allergen Information & Purity Guarantees:
Contains No: Yeast, dairy, egg, gluten, soy, or wheat.
Free From: Artificial colors, artificial flavors, added fragrances, or chemical preservatives.
How to Take Source Naturals L-Tryptophan 500mg: Expert Protocols
Timing and food pairings determine how your body utilizes L-Tryptophan. Follow these clinical protocols based on your personal wellness targets:
For Deep & Restful Sleep
- Dose: Take 2 to 3 capsules (1,000mg – 1,500mg).
- Timing: 45 to 60 minutes before your planned bedtime.
- Best Practice: Take with 4–6 oz of tart cherry juice, apple juice, or a light carb snack (like half a banana).
- Avoid: Do not pair with high-protein late-night snacks (like beef jerky or protein shakes) to avoid transporter competition.
For Daily Mood & Stress Balance
- Dose: Take 1 capsule (500mg) up to three times daily.
- Timing: Between meals (at least 45 minutes before eating or 2 hours after a meal).
- Best Practice: Consume with a small glass of diluted fruit juice or water.
- Synergy: Pair with active B-complex vitamins (especially B6) to optimize enzymatic serotonin conversion.
Critical Safety Guidelines, Medication Warnings & Quality History
Your health and safety are paramount. Because L-Tryptophan directly modulates your body's serotonin pathways, it is essential to observe the following medical precautions:
Important Drug Interaction Warning: Serotonin Syndrome
Do NOT take L-Tryptophan without supervising physician approval if you are currently taking prescription medications that increase serotonin levels, including:
- Selective Serotonin Reuptake Inhibitors (SSRIs: Prozac, Zoloft, Lexapro, Celexa)
- Serotonin-Norepinephrine Reuptake Inhibitors (SNRIs: Effexor, Cymbalta)
- Monoamine Oxidase Inhibitors (MAOIs: Nardil, Parnate)
- Tricyclic Antidepressants, Triptan migraine medications, or St. John’s Wort
Combining supplemental L-Tryptophan with these medications can lead to Serotonin Syndrome—a potentially dangerous elevation of central serotonin characterized by rapid heart rate, tremors, agitation, high fever, and muscle rigidity.
Pregnancy & Nursing: If you are pregnant, planning to become pregnant, or nursing, consult your healthcare practitioner prior to use.
The Truth About 1989 & Modern Quality Standards: Decades ago in 1989, an outbreak of Eosinophilia-Myalgia Syndrome (EMS) occurred in the United States. Extensive investigations by the U.S. FDA and CDC confirmed that the illness was caused not by L-Tryptophan itself, but by a contaminated batch produced by a single foreign chemical manufacturer with compromised filtration systems. Today, the FDA enforces strict microbiological and chemical purity specifications. Source Naturals subjects every production lot of L-Tryptophan to comprehensive testing to ensure complete freedom from contaminants.
Storage & Tamper Evident Packaging: Do not use if either tamper-evident seal is broken or missing. Store tightly sealed in a cool, dry place away from direct sunlight. Keep safely out of reach of children.
Frequently Asked Questions (FAQ)
How quickly does Source Naturals L-Tryptophan 500mg start working?
When taken on an empty stomach with fruit juice or light carbohydrates, peak bloodstream absorption occurs within 45 to 90 minutes. For sleep support, most individuals notice natural relaxation within an hour of taking 2 to 3 capsules. For general mood regulation, consistent daily use over 1 to 2 weeks provides the most noticeable and stable emotional support.
Will L-Tryptophan make me feel drowsy or sluggish during the day?
No, when taken at the recommended daytime dosage of 1 capsule (500mg) between meals, L-Tryptophan does not induce daytime sedation. Melatonin synthesis primarily occurs in dim or dark environments; during the daytime, your brain preferentially converts L-Tryptophan into serotonin to promote mental focus, emotional calm, and a positive outlook.
Why is L-Tryptophan preferred over synthetic sleeping pills?
Pharmaceutical sedatives often work by artificially forcing GABA receptors, which can alter your natural brain wave patterns and suppress crucial REM sleep. Clinical trials show that L-Tryptophan gently shortens the time it takes to fall asleep while keeping natural sleep stages intact, preventing sleep dependency, tolerance buildup, and morning "fog."
Can I take L-Tryptophan with my morning coffee or protein shake?
It is best not to. A high-protein shake contains large amounts of competing branched-chain amino acids (BCAAs) that block L-Tryptophan from crossing into your brain. For maximum benefits, take your capsule at least 45 minutes before or 2 hours after high-protein meals, preferably with water or fruit juice.
Is Source Naturals L-Tryptophan 500mg suitable for vegetarians?
This specific SKU (SN1984) uses gelatin capsules, which are animal-derived. If you adhere to a strict vegetarian or vegan lifestyle, Source Naturals offers vegetarian tablets and veggie capsules across their Serene Science® line.
Can I take L-Tryptophan alongside Melatonin?
Yes, many individuals combine a low dose of direct melatonin with L-Tryptophan. Melatonin provides immediate signaling to help you fall asleep, while L-Tryptophan gives your brain the internal reservoir required to produce its own sustained melatonin throughout the night, preventing middle-of-the-night awakenings. Always consult your doctor before combining supplements.
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Click here for L-Tryptophan 500mg from SOURCE NATURALS
Size: 120 caps
S.Retail: $ 32.50
26% OFF
$ 24.05
Clinical Grade • Item SKU: SN1985 • UPC: 021078019855
Source Naturals® L-Tryptophan 500 mg (120 Capsules)
Pharmaceutical-Grade Serotonin & Melatonin Precursor for Deep Sleep Latency and Daytime Mood Equilibrium
Falling asleep promptly and waking up refreshed shouldn’t feel like an uphill battle. Source Naturals® L-Tryptophan 500 mg delivers pure, bioavailable L-tryptophan—an essential amino acid that serves as your body’s primary raw material for manufacturing serotonin (your mood and emotional calm chemical) and melatonin (your internal sleep-wake regulator).
Because human physiology cannot produce L-tryptophan on its own, it must come entirely from dietary sources or high-potency nutritional supplementation. When everyday stress, irregular schedules, or nutritional gaps deplete your body’s tryptophan reserves, sleep architecture fractures and daytime resilience drops. Source Naturals provides a meticulously verified, hypoallergenic 500 mg dosage formulated for maximum central nervous system absorption.
✓ Shortens Sleep Latency
Helps your mind wind down so you drift to sleep faster naturally.
✓ Built-In Metabolic Safety
Regulated by natural brain enzymes to prevent serotonin spikes.
✓ No Morning Hangover
Maintains normal REM and deep restorative slow-wave cycles.
How L-Tryptophan Works in Plain English: Your Brain's Night-Shift Relay
To appreciate why Source Naturals L-Tryptophan 500mg stands apart from synthetic sleep sedatives, think of your brain's natural relaxation process as a precise, four-stage nighttime relay team:
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Stage 1: Crossing the Blood-Brain Barrier (The Entry Pass): Free-form L-tryptophan is transported across your blood-brain barrier via specialized LAT-1 carriers.
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Stage 2: Safe Enzymatic Conversion (The Built-In Speed Governor): Once inside the brain, an enzyme named tryptophan hydroxylase (TPH) converts tryptophan into 5-HTP (5-Hydroxytryptophan). Because this enzyme has a natural processing ceiling, your brain controls the exact rate of conversion, preventing erratic spikes.
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Stage 3: Serotonin Synthesis (The Emotional Balance Signal): 5-HTP is converted into serotonin with the assistance of vitamin B-6. Serotonin soothes irritability, eases persistent nervous tension, and establishes feelings of contentment.
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Stage 4: Melatonin Secretion (The Sleep Initiation Switch): As evening darkness settles, the pineal gland naturally transforms serotonin into melatonin, signaling every biological clock in your body that it is time for deep, restorative rest.
The Dual Niacin Bonus: Aside from synthesizing sleep and mood neurotransmitters, approximately 60 mg of dietary tryptophan can naturally synthesize 1 mg of Niacin (Vitamin B3) via the kynurenine pathway. A full 3-capsule serving of Source Naturals L-Tryptophan provides the biological equivalent of 25 mg of Niacin, contributing to cellular mitochondrial energy (NAD+) and central nervous system repair.
The "Tollbooth" Highway: Why Fruit Juice Maximizes Absorption
You may notice that the label directions on your bottle of Source Naturals L-Tryptophan specifically suggest taking your capsules “between meals and preferably with fruit juice.” This is grounded in Nobel Prize-caliber amino acid transport kinetics discovered by researchers at MIT.
Understanding LAT-1 Competitive Transport
Picture the protective blood-brain barrier as a busy suspension bridge with only one open tollbooth (the Large Neutral Amino Acid Transporter, or LAT-1). L-tryptophan must wait in line alongside competing branched-chain amino acids (BCAAs like leucine, isoleucine, and valine) found in everyday dietary proteins.
When you swallow your 500 mg capsules on an empty stomach with a small glass of fruit juice (or another light carbohydrate), your body secretes a tiny, natural pulse of insulin. Insulin acts like a traffic director: it directs competing BCAAs out of the bloodstream and into your skeletal muscles. This completely clears the tollbooth lane, allowing L-tryptophan to cross smoothly into the brain for conversion into calming serotonin and nighttime melatonin.
Scientific Reference: Fernstrom JD, Wurtman RJ. “Brain serotonin content: physiological regulation by plasma neutral amino acids.” Science. 1972;178(4059):414-416. [PMID: 5077329].
Clinically Validated Benefits: Evidence Backed by Human Trials
Unlike synthetic prescription hypnotics or over-the-counter antihistamines that forcefully sedate your central nervous system, L-tryptophan works harmoniously with your biological circadian rhythms. Clinical literature highlights three distinct areas of improvement:
1. Reduced Sleep Onset Latency and Wakefulness After Sleep Onset (WASO)
Sleep onset latency is clinical terminology for how many minutes you lie awake in bed staring at the ceiling before sleep begins. In a comprehensive systematic review and meta-analysis published in Nutrition Reviews (Sutanto et al., 2022), researchers analyzed clinical trials and revealed that oral L-tryptophan supplementation at doses of 1 gram and above significantly reduced wakefulness after sleep onset (WASO) and expedited sleep latency without depressing normal respiratory reflexes or causing next-day motor impairment.
2. Preserved Sleep Architecture (Deep Delta & REM Harmony)
Traditional sleeping pills often suppress REM (dream state) or Stage IV slow-wave delta sleep, leaving you feeling mentally foggy and physically unrefreshed the following morning. Double-blind trials demonstrated that supplemental L-tryptophan supports total restorative sleep stages while maintaining your natural, healthy sleep architecture.
3. Daytime Mood Resilience, Emotional Calm & Satiety Regulation
Clinical trials examining mood and affective disorders show that replenishing depleted plasma tryptophan levels improves emotional processing, increases patience, and dampens cortisol-driven stress reactions. Furthermore, because serotonin in the hypothalamus regulates satiety signaling, healthy tryptophan levels help curb evening emotional eating and obsessive carbohydrate cravings.
Head-to-Head Comparison: L-Tryptophan vs. 5-HTP vs. Melatonin
Many shoppers ask: “Should I take L-Tryptophan, 5-HTP, or standard Melatonin?” While all three touch the same neurochemical pathway, their mechanisms of action, site of conversion, and safety buffers differ significantly:
| Key Attribute |
Source Naturals L-Tryptophan 500mg |
5-HTP (5-Hydroxytryptophan) |
Direct Melatonin Supplements |
| Biological Mechanism |
Essential amino acid precursor to serotonin, melatonin, and niacin |
Intermediate metabolite that converts directly into serotonin |
Exogenous hormone supplying direct sleep-wake signals |
| Conversion Safety Buffer |
✓ High (Rate-limited by TPH enzyme) |
Low (Bypasses natural rate-limiting step) |
None (Direct hormonal intake) |
| Site of Conversion |
Centrally in brain tissue across the BBB |
Liver, gut, and brain (elevates peripheral serotonin) |
Receptor-level binding throughout body |
| Daytime Mood Support |
✓ Yes (Balanced daytime serotonergic tone) |
Yes (Can trigger mild GI upset) |
No (May trigger daytime drowsiness if taken by day) |
| Risk of Receptor Tolerance |
✓ Minimal (Gentle biological replenishment) |
Moderate with prolonged high dosages |
Moderate (Pineal receptor down-regulation risk) |
The Takeaway: While melatonin offers a quick fix for jet lag, and 5-HTP floods receptors quickly, Source Naturals L-Tryptophan 500mg provides the safest, most biologically regulated method for supporting sustained sleep quality and emotional well-being without overwhelming your hormonal feedback loops.
Complete Ingredient Listing & Supplement Facts
Full transparency is vital when selecting high-potency nutritional supplements. Below is the verified label breakdown for Source Naturals® L-Tryptophan 500 mg, 120 Capsules (SKU: SN1985):
Supplement Facts
Serving Size: 3 Capsules (500 mg per capsule)
Servings Per Container: 40
| Amount Per Serving |
% Daily Value |
| Iron (naturally occurring) 575 mcg |
3% |
L-Tryptophan
(Yields 25 mg Niacin equivalents)
|
1.5 g (1,500 mg)†
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† Daily Value (DV) not established.
Excipients & Inactive Ingredients:
Gelatin (capsule shell), dibasic calcium phosphate, microcrystalline cellulose, colloidal silica, and magnesium stearate.
Allergen & Purity Declarations:
Contains No: Yeast, dairy, egg, gluten, soy, or wheat. Contains absolutely no sugar, starch, salt, preservatives, artificial colors, artificial flavors, or fragrances.
The Gold Standard of Purity: The Truth About Tryptophan Safety
Informed consumers occasionally ask about the safety history of L-tryptophan supplements. In 1989, an outbreak known as Eosinophilia-Myalgia Syndrome (EMS) was linked to tryptophan products. Extensive scientific investigations conducted by the U.S. Food and Drug Administration (FDA), the Centers for Disease Control and Prevention (CDC), and the Mayo Clinic proved that the outbreak was not caused by L-tryptophan itself.
The Real Cause: A Single Contaminated Manufacturing Batch
The 1989 outbreak was caused by an overseas manufacturer (Showa Denko K.K.) that modified its bacterial fermentation filtration process, inadvertently introducing chemical contaminants (most notably 1,1′-ethylidenebis[L-tryptophan], or Peak E). Once the FDA implemented strict purity standards, pure pharmaceutical-grade L-tryptophan was fully re-authorized for commercial sale.
Today, Source Naturals® tests every raw material batch at its state-of-the-art Scotts Valley, California manufacturing plant. Using advanced High-Performance Liquid Chromatography (HPLC), each lot is rigorously verified to ensure 99%+ purity, complete freedom from synthetic contaminants, and full compliance with current Good Manufacturing Practices (cGMP).
Suggested Usage, Timing & Precision Protocols
To achieve optimal results based on your individual health objectives, follow these clinical guidelines:
For Restful Nighttime Sleep Support:
Take 3 capsules (1,500 mg) approximately 30 to 60 minutes before bedtime.
Pro-Tip: Consume with 4 to 6 ounces of tart cherry juice, diluted apple juice, or water with a light carbohydrate cracker to optimize blood-brain barrier transport.
For Daytime Emotional Calm & Craving Control:
Take 1 capsule (500 mg) three times daily, taken strictly between meals on an empty stomach.
Pro-Tip: Spacing doses throughout the day helps maintain stable plasma serotonin precursors without causing daytime sleepiness.
Important Medical Precautions & Drug Interactions
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Do not take with prescription antidepressants: Do not combine L-tryptophan with Selective Serotonin Reuptake Inhibitors (SSRIs such as fluoxetine, sertraline), SNRIs, Monoamine Oxidase Inhibitors (MAOIs), or migraine triptans, as doing so may cause an excess buildup of serotonin (Serotonin Syndrome).
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Pregnancy & Nursing: If you are pregnant, planning to become pregnant, or breastfeeding, consult your personal physician before using this product.
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Operating Machinery: Because bedtime dosages may induce drowsiness, do not drive or operate heavy machinery immediately following consumption.
Frequently Asked Questions (FAQ)
How long does it take for Source Naturals L-Tryptophan 500mg to work?
When taken on an empty stomach with a small amount of carbohydrate or juice, peak plasma levels of L-tryptophan are typically reached within 60 to 90 minutes. For sleep support, most individuals experience gentle drowsiness within 45 to 60 minutes. For mood and emotional balance, cumulative benefits generally build over 7 to 14 days of consistent, divided daily dosing.
Will L-tryptophan make me groggy or tired the next morning?
No. Unlike synthetic sleep medications or sedating antihistamines, L-tryptophan is converted via natural metabolic pathways and does not distort slow-wave or REM sleep architecture. Clinical trials show that doses of 1,000 mg to 1,500 mg do not induce morning cognitive impairment or residual psychomotor grogginess.
Why is L-tryptophan preferred over 5-HTP for many people?
L-tryptophan enters the central nervous system before converting to serotonin through an enzyme called tryptophan hydroxylase (TPH). Because TPH operates with a natural biological ceiling, your body produces only the exact amount of serotonin it requires. In contrast, 5-HTP converts into serotonin quickly in peripheral organs like the gut and liver, which can lead to nausea or gastrointestinal sensitivity.
Why should I take L-tryptophan on an empty stomach?
Dietary protein sources (such as chicken, eggs, and dairy) contain competing Large Neutral Amino Acids (BCAAs) that crowd the blood-brain barrier transport carrier (LAT-1). Taking L-tryptophan on an empty stomach with a sip of fruit juice prevents this competition and allows tryptophan to cross directly into your brain.
Can I take Source Naturals L-Tryptophan if I am currently taking an antidepressant?
No. You should not combine L-tryptophan supplements with prescription SSRIs (such as Prozac, Zoloft, or Lexapro), SNRIs, MAOIs, or triptan medications without explicit physician supervision. Combining supplemental serotonin precursors with medications that inhibit serotonin reuptake carries a risk of Serotonin Syndrome.
How many capsules are in bottle SKU SN1985, and how long does it last?
Each bottle of SKU SN1985 contains 120 capsules (500 mg each). When used for sleep support at the clinical 3-capsule bedtime dose (1,500 mg), one bottle provides a full 40-night supply. If taken for daytime mood support at 1 capsule three times daily, one bottle also lasts 40 days.
Scientific References & Authoritative Clinical Sources
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Sutanto CN, Loh WW, Kim JE. “The impact of tryptophan supplementation on sleep quality: a systematic review, meta-analysis, and meta-regression.” Nutrition Reviews. 2022;80(2):306-316. doi:10.1093/nutrit/nuab027. [PMID: 33942088].
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Fernstrom JD, Wurtman RJ. “Brain serotonin content: physiological regulation by plasma neutral amino acids.” Science. 1972;178(4059):414-416. doi:10.1126/science.178.4059.414. [PMID: 5077329].
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Hartmann E. “Effects of L-tryptophan on sleepiness and on sleep.” Journal of Psychiatric Research. 1982-1983;17(2):107-113. doi:10.1016/0022-3956(82)90012-7. [PMID: 6764931].
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Silber BY, Schmitt JA. “Effects of tryptophan on human brain serotonin and cognition: a review.” Neuroscience & Biobehavioral Reviews. 2010;34(3):387-407. doi:10.1016/j.neubiorev.2009.08.005. [PMID: 19683017].
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Richard DM, Dawes MA, Mathias CW, Acheson A, Hill-Kapturczak N, Dougherty DM. “L-Tryptophan: Basic Metabolic Functions, Behavioral Research and Clinical Applications.” International Journal of Tryptophan Research. 2009;2:45-60. doi:10.4137/ijtr.s2129. [PMID: 20651948].
FDA Disclaimer: *These statements have not been evaluated by the Food and Drug Administration. This dietary supplement product is not intended to diagnose, treat, cure, or prevent any disease. Always seek the advice of your qualified physician or healthcare provider before beginning any new nutritional regimen.
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