amino acid

Glycine supplements

Half of the 1,078 glycine supplements in the NIH label database that print an amount list 300 mg or less per serving; the middle half list 100 mg to 846 mg (DSLD version 9.4.0, January 2026). The 52 products whose only supplement ingredient is glycine list a median of 1,000 mg.

How much glycine do supplements contain?

The median product lists 300 mg per serving. One in ten lists 30 mg or less, one in ten 1,650 mg or more. The amount printed most often is 100 mg (124 products).

Which products list the most glycine?

On-market products, per serving, with a plausible amount: the rule leaves out likely entry slips, such as an amount far beyond every other label with no %DV or strength on the label to back it (each product page still shows its own amount, marked).

• Amino 2400 Wild CherryMET-Rx5,557 mg
• Hydrolyzed Protein Collagen Decadent ChocolateBody Kitchen5,250 mg
• Advanced Anti-Aging Formula Effervescent Drink Mix OrangeTimeFighters4,500 mg
• Free Form L-Glycine UnflavoredMuscle Feast4,300 mg
• Anti-Aging 3 Collagen Type I, II & III TropicalDr. Venessa's4,000 mg
• Anti-Aging 3 Collagen Type I, II & III Mixed BerryDr. Venessa's4,000 mg
• SecretagoguePrime4,000 mg
• SecretagogueUltra Prime4,000 mg

Have the amounts changed over the years?

Products whose current label entered DSLD in 2011 list a median of 340 mg; those entered in 2025, 315.3 mg.

In which products and brands?

Brands listing it most: Douglas Laboratories (38), AdvoCare (29), Metabolic Maintenance (28), Metagenics (20), Enzymatic Therapy (19), Integrative Therapeutics (19), Pure Encapsulations (16), Muscle Feast (16), NutraBio (16), Thorne Research (13).

Every product listing glycine

1,715 products, A to Z by name (page 13 of 35), each with the amount its label prints; an amount far outside what other labels print is marked as a possible slip.

• GH MaleNatures Plus · off the market110 mg
• Gh MaleNaturesPlus110 mg
• GH Pituitary Support Night FormulaLife Extension1,000 mg
• GH Stack Grape FlavorUniversal1,100 mg
• GH-Boost Tea-Berry BlastNugenix100 mg
• gHP SportSomaLife International500 mg
• GHR EssentialsSwanson Condition Specific Formulas · off the market230 mg
• GHR FormulaSwanson230 mg
• GHT MaleNature's Plus · off the marketin a blend
• GHT MaleNaturesPlusin a blend
• GhtxMM Sports Nutritionin a blend
• GI SustainMetagenics100 mg
• Glow Collagen Peptides Natural FlavourBody Attack2,400 mg
• Gluca-Balance 710 mgMontiffin a blend
• GlutaPlex GlutamineProfessional Botanicalsin a blend
• Glutathione 250 mgProCaps · off the market50 mg
• Glutathione 250 mgProCaps Laboratories100 mg
• Glutathione BoosterCarlson50 mg
• Glutathione PrecursorsGenestra Brands100 mg
• Glutathione SymmetryReturn Healthy200 mg
• GLY ForteGenestra Brands15 mg
• GlycineProtocol For Life Balance1,000 mg
• GlycineThorne Research · off the market1,000 mg
• GlycineMetabolic Maintenance500 mg
• GlycineSource Naturals1,000 mg
• GlycineCarlson · off the market2,000 mg
• GlycinePure Encapsulations1,500 mg
• GlycineNOW3,000 mg
• GlycineEarthborn Elements1,290 mg
• GlycineNutraBio1,000 mg
• GlycineBulkSupplements.com3,000 mg
• GlycineSuperSmart2,500 mg
• GlycineThorne1,000 mg
• Glycine & NACDoNotAge.org600 mg
• Glycine (Free Form)Herbadiet1,000 mg
• Glycine (Free Form) PowderHerbadiet1,000 mg
• Glycine + Taurine & L-Proline UnflavoredPure Power4,000 mg
• Glycine 1,000 mgLuckyVitamin3,000 mg
• Glycine 100 mgBest Naturals1,000 mg
• Glycine 1000 mgDouble Wood Supplements1,000 mg
• Glycine 1000 mgNOW3,000 mg
• Glycine 1000 mgLife Extension1,000 mg
• Glycine 250 mgKirkman250 mg
• Glycine 3000 mgPuritan's Pride3,000 mg
• Glycine 3000 mg CapsulesBulkSupplements.com3,000 mg
• Glycine 500 mgPureFormulas · off the market500 mg
• Glycine 500 mgSolgar500 mg
• Glycine 500 mgCountry Life500 mg
• Glycine 500 mgDouglas Laboratories500 mg
• Glycine 500 mgAN Amazing Nutrition Amazing Formulas500 mg

Where next?

• Check an amount of glycine
• Labels above the upper limit
• All ingredients