Recharge your brain under pressure. Source Naturals L-Tyrosine 500 mg delivers a pure, free-form amino acid designed to fuel your brain’s natural motivation chemical—dopamine—and protect mental sharpness during demanding, high-stress situations.
✔ Potency: 500 mg Free-Form TyrosineThink of your brain like a high-performance sports car. When you cruise down an empty highway, the engine hums along using very little fuel. But when you slam on the gas pedal—pushing through back-to-back deadlines, lack of sleep, intense exercise, or emotional stress—your brain rapidly burns through its supply of communication chemicals called neurotransmitters.
These critical chemicals include:
L-Tyrosine is the physical raw material your brain requires to build all three. When stress runs high and your natural stores get drained, mental fatigue, brain fog, and scattered focus set in. Supplementing with Source Naturals L-Tyrosine 500 mg replenishes this reserve tank so your nervous system can keep up with the demands of your day.
Unlike synthetic stimulants that spike your nervous system and leave you jittery, L-Tyrosine is a non-essential amino acid that acts only when demands are high. Decades of peer-reviewed clinical research confirm its effectiveness in several primary areas:
When acute stress strikes, working memory (your ability to hold information in your head while problem-solving) is the first mental faculty to crash. Research published in Frontiers in Behavioral Neuroscience demonstrated that tyrosine supplementation significantly improved working memory updating during taxing cognitive challenges.
Citation: Colzato, L. S., et al. (2013). Working memory reloaded: tyrosine repletes updating in the N-back task. Frontiers in Behavioral Neuroscience, 7, 200.Military and operational studies have tested L-Tyrosine in extreme circumstances. In a landmark study involving cadets undergoing an intense combat training week, researchers found that tyrosine prevented the cognitive task degradation and blood pressure abnormalities commonly caused by heavy physical strain and sleep deprivation.
Citation: Deijen, J. B., et al. (1999). Tyrosine improves cognitive performance and reduces blood pressure in cadets after one week of a combat training course. Brain Research Bulletin, 48(2), 203–209.Beyond brain function, tyrosine attaches to iodine atoms in your thyroid gland to synthesize both thyroxine (T4) and triiodothyronine (T3), the master regulators of your basal metabolic rate. It is also the structural precursor to melanin, the pigment that protects skin and hair from UV damage.
Citation: Fernstrom, J. D. (1990). Aromatic amino acids and monoamine synthesis in the central nervous system: influence of diet. The Journal of Nutritional Biochemistry, 1(10), 508–517.Many supplement shoppers wonder whether they should purchase standard free-form L-Tyrosine or the acetylated version known as NALT. While NALT dissolves faster in water, peer-reviewed pharmacokinetics demonstrate that Free-Form L-Tyrosine (as used in Source Naturals SN0190) is far more bioavailable for brain support:
| Feature | Free-Form L-Tyrosine (Source Naturals) | N-Acetyl L-Tyrosine (NALT) |
|---|---|---|
| Blood-Brain Conversion | Direct & High: Rapidly raises blood tyrosine levels | Poor: Kidneys excrete up to 35% unchanged in urine |
| Scientific Support | Used in >90% of all published human clinical trials | Limited clinical evidence for cognitive enhancement |
| Cost-to-Value Ratio | High yield per 500 mg tablet | Higher manufacturing cost with lower net absorption |
Taking amino acid supplements correctly makes a substantial difference in how much reaches your brain. Follow these science-backed guidelines:
L-Tyrosine competes with other amino acids (like BCAAs found in dairy, meat, and protein shakes) to pass through the blood-brain barrier. Take your tablet 30 to 45 minutes before a meal or at least 2 hours after eating for clean uptake.
Blood levels of L-Tyrosine peak between 60 and 120 minutes post-ingestion. Schedule your dose roughly 1 hour before high-intensity focus sessions, exams, public speaking, or heavy workouts.
Because L-Tyrosine acts as a building block for norepinephrine and adrenaline, taking it after 4:00 PM may promote alertness and interfere with your natural sleep onset. Morning or early afternoon use is ideal.
Because L-Tyrosine influences vital neurotransmitters and hormones, specific individuals must exercise caution or avoid this product entirely:
Combining tyrosine with Monoamine Oxidase Inhibitors (such as phenelzine, tranylcypromine, or selegiline) can prevent the breakdown of tyramine and catecholamines, potentially triggering a dangerous, acute spike in blood pressure (hypertensive crisis).
Tyrosine competes directly with prescription Levodopa for intestinal absorption. Co-administration can reduce the clinical effectiveness of Levodopa therapy for Parkinson's disease. Separate doses by several hours under medical supervision.
Individuals with hyperthyroidism, Graves' disease, melanoma, or those who are pregnant or nursing should consult a physician before using supplemental tyrosine.
VitaNet is committed to 100% label transparency. Below is the verified nutritional panel for Source Naturals L-Tyrosine 500 mg Tablets (SKU: SN0190):
Serving Size: 1 Tablet
Servings Per Container: 100
† Daily Value not established.
Every excipient in this formulation is pharmaceutical grade and serves a designated purpose in tablet integrity:
When taken on an empty stomach with a glass of water, L-Tyrosine is absorbed quickly. Blood concentrations begin rising within 30 minutes and typically peak between 60 to 120 minutes, offering noticeable mental stamina when timed before demanding tasks.
Yes, 1 tablet (500 mg) daily is safe for consistent daily use in healthy adults. However, many users prefer "cycling" L-Tyrosine—taking it on work days, during heavy study weeks, or before stressful events, and taking breaks on weekends—to maintain receptor sensitivity.
Yes. Many nootropic users pair L-Tyrosine with caffeine. While caffeine stimulates the release of catecholamines, L-Tyrosine provides the raw building blocks to replenish them, smoothing out post-caffeine crashes. If you are sensitive to caffeine, begin with half your normal coffee intake.
In clinical studies of healthy adults, standard doses of L-Tyrosine did not raise resting blood pressure. In fact, under extreme acute stress, it helped stabilize blood pressure. However, if you take blood pressure medications or MAO inhibitors, check with your physician before supplementing.
A single 500 mg tablet contains negligible calories (under 2 calories) and will not trigger an insulin spike or disrupt the physiological benefits of fasting. Taking it during a morning fast is popular because absorption is maximized on an empty stomach.
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