NOW Foods Glycine Pure Powder delivers 100% pure, crystalline free-form glycine (chemical formula: C2H5NO2) to help quiet an overactive mind, encourage deep and restorative sleep, and rebuild healthy collagen tissues throughout your body [1, 2]. Glycine is the smallest and simplest amino acid in human biology, acting as a natural calming messenger that helps your body cool down so you can fall asleep comfortably [3, 4]. Every 3/4 level teaspoon serving supplies a full 3,000 mg of pharmaceutical-grade glycine powder with zero fillers, binders, or capsule shells, giving you a fast-dissolving, naturally sweet way to wake up feeling energized and clear-headed [1, 2].
Quick Specs Snapshot
✓Active Form & Potency: 3,000 mg (3 g) of 100% pure, crystalline Free-Form Glycine per 3/4 level teaspoon serving.
✓Primary Cellular Target: Brain biological clock receptors (NMDA receptors in the suprachiasmatic nucleus), central nervous system relaxation pathways, and structural collagen synthesis [1, 3, 5].
✓Supply & Value Math: 1 lb (454 g) tub provides approximately 151 full 3 g nighttime sleep servings—over 5 full months of nightly support—for just pennies per night.
✓Formulation Purity: 100% pure single-ingredient powder with zero other ingredients. Non-GMO, vegan, vegetarian, and completely free of gluten, soy, dairy, nuts, and sesame.
Buyer’s Guide & Amino Acid Form Comparison
Why Pure Free-Form Powder Beats Pills & Cheap Big Box Brands
In ordinary dietary protein like beef, poultry, or gelatin, amino acids are locked together in long, complicated chains like links on an iron anchor chain. Your digestive system has to expend valuable energy breaking those links apart before absorption can begin. NOW® Glycine Pure Powder provides 100% Free-Form Glycine, meaning every single molecule is already separated and unbound. Because there are no capsule shells to dissolve in stomach acid, this fine crystalline powder absorbs almost instantly when stirred into water or tea, calming your nervous system within minutes without heaviness or bloating [1, 5]. Cheap mass-market brands often cut corners with bulk industrial powders loaded with synthetic anti-caking agents, artificial sweeteners, or heavy metal contaminants. NOW delivers unadulterated, pharmaceutical-grade purity verified by independent laboratory testing.
Ideal For Shoppers Who:
✓Want a clean, non-habit-forming way to fall asleep faster and stay asleep without next-morning grogginess [1, 2].
✓Dislike swallowing pills and prefer stirring a naturally sweet, pleasant powder into water, bedtime tea, or juice [3, 4].
✓Want the maximum value possible, with 151 full 3 g clinical servings in a single economical 1 lb container [5].
Consider Another Option If:
✘You travel frequently and prefer pre-measured capsules rather than measuring loose powder with a spoon (choose NOW Glycine 1000 mg Veg Capsules).
✘You are pregnant, nursing, or shopping for a child under 18 without direct supervision from your healthcare provider.
✘You take prescription antipsychotic medications such as clozapine, which require close physician guidance regarding supplemental glycine intake.
Risk-Free Assurance: Every purchase is backed by VitaNet®, LLC’s unconditional 100% money-back guarantee—even on opened containers, with return shipping covered—so you can experience your personal sleep comfort completely risk-free.
Biochemical Mechanisms & Cellular Pathways
Glycine (written by biochemists as NH2CH2COOH) is the simplest amino acid found in nature, yet it acts like a biological master key across your nervous system, sleep architecture, and cellular repair. Inside your body, glycine works through four vital pathways:
1. Quieting Overactive Nerves and Calming the Brain
Nerve cells in your brain and spine speak to each other using excitatory and inhibitory signals. Excitatory signals act like an accelerator pedal, keeping you alert and thinking rapidly. Glycine acts as your body’s natural brake pedal. In your spinal cord and brainstem, glycine binds to specialized ports called glycine receptors (GlyR) [3, 4]. When glycine docks into these receptors, it opens microscopic gateways that allow negative chloride ions (Cl−) to flow inward. This electrical change calms hyperactive neurons, helping physically tense muscles relax and allowing a racing mind to quiet down before bed [3, 4].
2. Cooling Your Internal Body Clock for Deep Sleep
Your brain houses an internal master biological clock called the suprachiasmatic nucleus (SCN). For your body to slip into deep, restorative slow-wave sleep, your core body temperature must naturally drop by about 1 to 2 degrees Fahrenheit. Glycine binds to NMDA receptors located directly inside this circadian clock [3]. This activates peripheral vasodilation, gently relaxing the tiny blood vessels in your hands and feet so heat can radiate away from your body's core into the surrounding air [3]. This gentle temperature drop signals your brain that it is time to sleep, helping you fall asleep faster without disrupting natural sleep stages or leaving you feeling groggy the next morning [1, 3].
3. Structural Building Block for Collagen and Cartilage
Collagen is the flexible structural mesh that holds your skin, joints, ligaments, tendons, and blood vessels together. When scientists analyze collagen protein chains under a microscope, they find that every third amino acid in the entire molecule is glycine [5]. Because your body can only make limited amounts of glycine internally, providing pure dietary glycine powder ensures your joint cartilage cells (chondrocytes) and skin cells (fibroblasts) have plenty of raw materials to repair daily physical wear and tear [5].
4. Fueling Glutathione: The Body's Master Antioxidant
Every cell in your body defends itself against daily oxidative stress using a protective molecule called glutathione. To synthesize glutathione, your liver combines three amino acids: glutamate, cysteine, and glycine. Biochemical studies confirm that glycine is often the limiting ingredient—meaning if your body runs low on glycine, your cells cannot produce enough glutathione to neutralize harmful free radicals and protect vital organs [5]. Regular supplemental glycine keeps this critical antioxidant defense running at peak capacity [5].
Daily Dosing, Timing & Synergy Protocol
Optimal Timing & Bedtime Intake
For restful nighttime sleep and nervous system relaxation, stir 3/4 level teaspoon (yielding 3,000 mg of pure glycine) into 4 to 8 ounces of water (H2O), chamomile tea, or juice approximately 30 to 60 minutes before bedtime on an empty stomach [1, 2]. Clinical trials show that this 3 g serving size provides the exact concentration required to cross the blood-brain barrier and help your core body temperature cool down in time for sleep [1, 3].
Flexible Daily Routine & Split-Dosing Strategy
Because NOW Glycine comes in pure powder form, you have complete control over your serving size to match your personal goals:
✓For Nighttime Sleep Support: Take 3/4 level teaspoon (3,000 mg) mixed into water or herbal tea 30 to 60 minutes before going to bed on an empty stomach [1, 4].
✓For Joint, Collagen & Daytime Support: Stir 1/4 level teaspoon (approx. 1,000 mg) into morning coffee, afternoon tea, or a smoothie two to three times daily. This provides a steady supply of structural building blocks throughout the day [5].
Smart Synergies & Spacing Rules
✓Beneficial Synergies: Glycine pairs wonderfully with Magnesium (such as Magnesium Bisglycinate or Malate) to deepen muscle relaxation, and with Vitamin C to activate the enzymes that build collagen fibers [5].
✓Spacing Away from High-Protein Meals: Avoid taking your sleep dose alongside heavy whole-food protein meals or thick whey protein shakes. High concentrations of other dietary amino acids compete for the same intestinal absorption doors, which can delay bedtime calming benefits.
Timeline of Expectations
Night 1 – Week 1: Fast bedtime support. Most individuals notice settling into sleep faster, waking up less frequently during the night, and feeling more alert the following morning without any hangover sensation [1, 2, 4].
Weeks 3–4: Consistent restorative sleep supports daytime focus, steady stress resilience, and continuous replenishment of cellular glutathione stores [4, 5].
NOW Foods Glycine Pure Powder is a fine, glistening white crystalline powder. Unlike chalky powders that clump into unappetizing lumps, pure glycine dissolves completely into room temperature or warm liquids with just a brief stir of a spoon. It leaves no gritty sediment at the bottom of your glass, making it one of the most pleasant and effortless nutritional powders to consume daily.
Natural Aroma & Sweet Taste Profile
Glycine takes its name directly from the ancient Greek word glykys, meaning “sweet.” Pure free-form glycine has an entirely natural, pleasant sweetness (about 70% as sweet as table sugar) with absolutely zero bitter chemical aftertaste. Because it is completely odorless and naturally sweet, many people enjoy using it as a healthy, zero-sugar sweetener in evening chamomile tea or warm almond milk. Because NOW Foods never uses artificial whiteners or synthetic processing aids, subtle natural color variations may occur between batches.
Other Ingredients Demystified: Literally None!
Take a look at the “Other Ingredients” line on the supplement facts panel: it lists None. This formula is 100% pure, crystalline free-form glycine. There are:
✓No capsule shells or gelatins (100% vegan-friendly).
✓No flow agents or lubricants like magnesium stearate or stearic acid.
✓No anti-caking silica or chemical preservatives.
✓No artificial sweeteners, flavors, or synthetic colors.
Packaging & Storage Guidelines
This product is packaged and sold by weight, not volume, in a sturdy recyclable tub. Keep the lid tightly screwed shut and store your container in a cool, dry place after opening, such as a pantry shelf or kitchen cupboard. Avoid damp environments like bathroom cabinets to protect the crystalline powder from ambient humidity.
NOW Foods In-House Laboratory Testing & Strict Contaminant Standards
Do not gamble your wellness on generic big box store brands. Many low-cost supplements sold in mass-market retail chains or third-party online marketplaces are produced by anonymous contract factories overseas that skip critical safety screening. Independent testing repeatedly uncovers that discount amino acid powders can contain hidden heavy metals, synthetic adulterants, or diluted potency. NOW Foods operates one of the most advanced private analytical testing complexes in the natural products industry to guarantee total purity:
✓ISO/IEC 17025:2017 Accredited Analytical Laboratories: NOW maintains over 40,000 square feet of state-of-the-art laboratory testing facilities in Bloomingdale, Illinois and Sparks, Nevada, staffed by over 150 full-time chemists, microbiologists, and biochemists who perform more than 16,000 to 31,000 individual safety tests each month.
✓ICP-MS Heavy Metal Testing (Parts-Per-Billion Precision): Using Inductively Coupled Plasma Mass Spectrometry, every single production lot is screened down to parts per billion for Lead (Pb), Arsenic (As), Cadmium (Cd), and Mercury (Hg), ensuring safety levels strictly beat California Proposition 65 limits (<0.5 mcg/day lead) and USP benchmarks.
✓HPLC Molecular Identity & Potency Verification: High-Performance Liquid Chromatography chemically verifies that every batch contains 100% pure crystalline free-form glycine, guaranteeing zero synthetic dilution or undeclared fillers.
✓GC-MS/MS Pesticide & Solvent Screening: Gas Chromatography-Tandem Mass Spectrometry screens raw materials for over 400 agricultural pesticides, fungicides, environmental chemicals, and volatile organic solvent residues.
✓Microbiological Safety Screening & Certified cGMP: In-house microbiologists run comprehensive culture and molecular tests to confirm complete freedom from pathogens such as Salmonella, Escherichia coli, and Staphylococcus aureus, manufactured in NPA “A-rated” facilities audited by UL Solutions.
Supplement Facts & Retailer Verification
Supplement Facts
Serving Size: 3/4 Level Teaspoon (approx. 3 g)
Servings Per Container: about 151
Description
Amount per Serving
% Daily Value
Glycine (Free-Form)
3 g (3,000 mg)
†
† Daily Value not established. Other Ingredients: None. Allergen Purity: 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, or have a medical condition. Keep out of reach of children. Manufacturing & Heritage: Natural color variation may occur in this product. This product is sold by weight not volume. Packaged and quality tested in the USA. Store in a cool, dry place after opening. Family owned since 1968.
Curator’s Quality Note & Store Heritage
Manufactured by NOW Foods in an audited, cGMP-certified facility. Hand-selected, biochemically vetted, and shipped directly by VitaNet®, LLC. Founded in 1995 with our physical storefront located at 887 Edison Street Northwest in Hartville, Ohio 44632, VitaNet brings over 31 years of trusted supplement curation, customer care, and human biochemistry experience directly to your wellness routine.
As a Better Business Bureau A+ accredited merchant, we partner directly with authorized manufacturers to guarantee factory-fresh, authentic inventory stored in temperature-controlled warehouses. Every single order is backed by our unconditional 100% money-back guarantee: if you are unsatisfied for any reason, we will refund your purchase and pay for return shipping, even on opened containers! Have questions? Call our friendly 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.
Frequently Asked Questions
Why does pure glycine powder taste naturally sweet if it contains zero sugar?
Glycine gets its name directly from the ancient Greek word glykys, which translates to “sweet.” Even though glycine is an amino acid and not a carbohydrate or sugar, its molecular structure fits directly into the sweet taste receptor cells on your tongue. It provides an enjoyable, mild sweetness without raising blood glucose levels, making it a delicious, sugar-free addition to nighttime drinks.
How quickly does glycine powder absorb compared to capsules or pills?
Because NOW Glycine Pure Powder is 100% free-form and already dissolved in liquid when you drink it, it begins passing through your stomach into your bloodstream within 15 to 30 minutes [1, 5]. Capsules and hard-pressed tablets require extra time for stomach acid to break down the outer shell or binders before the active amino acid can be absorbed.
Can I stir NOW Glycine Powder into warm tea or hot bedtime drinks?
Yes. Glycine is thermally stable and dissolves smoothly into warm water, chamomile tea, or warm almond milk. While it easily tolerates normal drink temperatures, you should avoid mixing it into violently boiling water on the stovetop, as extreme sustained boiling heat can eventually degrade amino acid bonds.
Will taking 3 grams of glycine powder break an intermittent fast?
No. Pure free-form glycine contains zero carbohydrates, zero fat, and negligible caloric impact. Taking your nightly 3/4 level teaspoon in plain water during an evening fasting window will not trigger a meaningful insulin spike or interrupt metabolic ketosis, keeping your fast fully intact.
How does NOW Foods verify this bulk powder is free of heavy metals and contaminants?
NOW Foods tests every batch in their ISO/IEC 17025 accredited analytical laboratories. Using Inductively Coupled Plasma Mass Spectrometry (ICP-MS), technicians analyze raw materials down to parts per billion (ppb) for lead, arsenic, cadmium, and mercury, ensuring levels easily beat California Proposition 65 and USP standards. In addition, High-Performance Liquid Chromatography (HPLC) verifies 100% active glycine purity, while bio-assays confirm complete freedom from pathogens like Salmonella and E. coli.
Scientific References
Yamadera, W., Inagawa, K., Chiba, S., Bannai, M., Takahashi, M., & Nakayama, K. (2007). Glycine ingestion improves subjective sleep quality in human volunteers, correlating with polysomnographic changes. Sleep and Biological Rhythms, 5(2), 126–131.
Inagawa, K., Hiraoka, T., Kohda, T., Yamadera, W., & Takahashi, M. (2006). Subjective effects of glycine ingestion before bedtime on sleep quality. Sleep and Biological Rhythms, 4(1), 75–77.
Kawai, N., Sakai, N., Okuro, M., Karakawa, S., Tsuneyoshi, Y., Kawasaki, N., Takeda, T., Bannai, M., & Nishino, S. (2015). The sleep-promoting and hypothermic effects of glycine are mediated by NMDA receptors in the suprachiasmatic nucleus. Neuropsychopharmacology, 40(6), 1405–1416.
Bannai, M., & Kawai, N. (2012). New therapeutic strategy for amino acid medicine: Glycine improves the quality of sleep. Journal of Pharmacological Sciences, 118(2), 145–148.
McCarty, M. F., O'Keefe, J. H., & DiNicolantonio, J. J. (2018). Dietary glycine is rate-limiting for synthesis of glutathione and of collagen: May have broad potential for the prevention of health problems. Ochsner Journal, 18(1), 81–87.
