amino acid
Cysteine supplements
Half of the 516 cysteine supplements in the NIH label database that print an amount list 85 mg or less per serving; the middle half list 30 mg to 200 mg (DSLD version 9.4.0, January 2026). The 21 products whose only supplement ingredient is cysteine list a median of 500 mg.
- Products listing it
- 753516 print an amount; 236 list it inside a blend without an amount
- Median per serving
- 85 mgmiddle half 30 mg to 200 mg
How much cysteine do supplements contain?
The median product lists 85 mg per serving. One in ten lists 8 mg or less, one in ten 468 mg or more. The amount printed most often is 50 mg (73 products).
Products by amount of cysteine per serving
516 products, log scale; extreme 0.2% at each end left out of the drawing.
| Amount per serving | Products | For example |
|---|---|---|
| 50 mg | 73 | LifeEssence (Pure Essence Labs); Men's Multiple (Radiance Select); Maximum Anti-Oxidant Formula (Radiance) |
| 100 mg | 66 | Nails (Viva Vitamins); Great Hair (Vitabase); Super Antioxidant Formula (Vitabase) |
| 200 mg | 33 | Ultra-Guard Low Allergenicity Antioxidant (Douglas Laboratories); Hair, Skin, & Nail essentials (Healthy Choice Naturals); Basic Scavengers (Metabolic Maintenance) |
| 500 mg | 23 | L-Cysteine 500 mg (Douglas Laboratories); L-Cysteine 500 mg (Vitamin World); Metabolic Matrix (Energetix) |
| 150 mg | 22 | Recon (MusclePharm); Redox (Douglas Laboratories); Dextox In Guard Tabsules (Perque) |
| 10 mg | 21 | 30 Day Beauty Regimen (Bronson); Amino Acids Formula (Martin Avenue Pharmacy); Oxy-5000 Forte (AB American Biologics) |
| 5 mg | 14 | NSAID Support (The Professional Series); NSAID Rx Depletion (Martin Avenue Pharmacy); Bromelain Plus CLA (Biotics Research Corporation) |
| 25 mg | 13 | Curcumax (Integrative Therapeutics); Growth Vitamins Vanilla Flavored (The Beard Club); Essential Vitamins, Minerals & Antioxidants (Williams Nutrition) |
| 30 mg | 13 | Max-Amino Caps with Vitamin B6 (Country Life); UltraClear Vanilla Flavor (Metagenics); VitalShake (VitalBulk) |
| 250 mg | 10 | Premium Soy Protein Isolate Powder Chocolate (Vitamin World); Added Protection III (Douglas Laboratories); Added Protection III (Without Copper And Iron) (Douglas Laboratories) |
Source: Supplement Facts rows of every product's current label, NIH ODS Dietary Supplement Label Database version 9.4.0; amounts in one measure (weight).
Which products list the most cysteine?
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).
- 100% Whey Protein ApfelstrudelBody Attack Sports Nutrition2,390 mg
- Cysteine 500 mgDr. Clark Research Association Dr. Clark Zentrum1,500 mg
- CysRepleteCHK Nutrition1,500 mg
- 100% Pure L-CysteineNutraBio1,000 mg
- Healthy Hair FormulaVitamin World1,000 mg
- Healthy Hair FormulaPuritan's Pride Premium1,000 mg
- L-Cysteine PowderSource Naturals900 mg
- Winter WellnessLife Extension700 mg
Have the amounts changed over the years?
Products whose current label entered DSLD in 2011 list a median of 50 mg; those entered in 2025, 80 mg.
| Year | Products | Median per serving |
|---|---|---|
| 2011 | 21 | 50 mg |
| 2012 | 48 | 150 mg |
| 2013 | 84 | 50 mg |
| 2014 | 26 | 195 mg |
| 2017 | 23 | 100 mg |
| 2019 | 23 | 60 mg |
| 2020 | 50 | 92.5 mg |
| 2021 | 30 | 100 mg |
| 2022 | 32 | 67.5 mg |
| 2023 | 39 | 50 mg |
| 2024 | 60 | 50 mg |
| 2025 | 38 | 80 mg |
Source: DSLD label entry dates and amounts, current labels.
In which products and brands?
Products listing cysteine by DSLD product type
Brands listing it most: Douglas Laboratories (33), Nature's Plus (22), Metagenics (13), Nutri-West (11), Vitamin World (11), DaVinci Laboratories Of Vermont (11), NaturesPlus (11), Metabolic Nutrition (10), Integrative Therapeutics (8), Natural Factors VegiDay (8).
Every product listing cysteine
753 products, A to Z by name (page 5 of 16), each with the amount its label prints; an amount far outside what other labels print is marked as a possible slip.
- FinuraAntioxidantTech375 mg
- FoliGrowth Ultimate Hair FormulaAdvanced Trichologyin a blend
- For Hair OnlyOnly Natural · off the market250 mg
- For Women OnlyOnly Natural · off the marketin a blend
- Forever VisionForever50 mg
- ForgivenF Forgiven · off the marketin a blend
- Formula VM-2000Solgarin a blend
- Free Amino AcidsNature's Sunshine21 mg
- Free Amino Acids with Magnesium & L-CarnitineNature's Sunshine · off the market21 mg
- Free AminosAllergy Research Groupin a blend
- Free AminosNutriCologyin a blend
- Free Radical QuenchersEcological Formulas60 mg
- Free-Form Amino AcidsEcological Formulasin a blend
- Gain Fast 3100 Vanilla ShakeUniversalin a blend
- Gc-MSM 3550Progressive Professional from Progressive Laboratories100 mg
- Genessenntials Spectra SNPDaVinci Laboratories Of Vermont · off the market25 mg
- Genessentials OS-1DaVinci Laboratories Of Vermont50 mg
- Gf-9Novex Biotechin a blend
- GF-9 Fruit PunchNovex Biotechin a blend
- GI SustainMetagenics25 mg
- Glucosamine ComplexGenestra Brands50 mg
- Glutathione Cell DefenseIntegrative Therapeutics80 mg
- Glutathione SymmetryReturn Healthy200 mg
- Glutathione, Cysteine & CLife Extension200 mg
- Gold CapsulesNatures Plus Source of Life · off the marketin a blend
- Gold TabletsNature's Plus Source of Life · off the marketin a blend
- Great HairVitabase100 mg
- Grey Hair FormulaSuperSmart150 mg
- Growth Vitamins Vanilla FlavoredThe Beard Club25 mg
- Gsh 250Douglas Laboratories · off the market5 mg
- Gut 4-tifyJust Thrive40 mg
- Gut Care for Kids Pineapple FlavourMetagenics200 mg
- Gut Health and Immunity BlendYuen Diing Enterprisein a blend
- HairViva Vitamins400 mg
- HairCodeagein a blend
- Hair & Nail24 Bio · off the market100 mg
- Hair & Nails FormulaSuperSmart120 mg
- Hair & Skin NutritionEnzymatic Therapy · off the market10 mg
- Hair and Nail24 Bio · off the market100 mg
- Hair Boost For WomenSignature Supplements0.0003 mg as transcribed, likely a slip
- Hair EffectsDaVinci Laboratories Of Vermont · off the market200 mg
- Hair EffectsDaVinci Laboratories200 mg
- Hair ForceKAL500 mg
- Hair Growth Formula24 Bio · off the market100 mg
- Hair MultivitaminCalifornia Gold Nutrition10 mg
- Hair Renew FormulaEuroMedica · off the market100 mg
- Hair Renew FormulaTerry Naturally100 mg
- Hair RenewalCodeagein a blend
- Hair revital xZenith Labs100 mg
- Hair Revitalizing FormulaSwanson100 mg