| Healthy Hair Formula | Puritan's Pride Premium | 1000 mg | — | Capsule |
| Healthy Hair Formula | Vitamin World | 1000 mg | — | Capsule |
| L-Cysteine Powder | Source Naturals | 900 mg | — | Powder |
| Winter Wellness | Life Extension | 700 mg | — | Capsule |
| BreatheMD | 1MD Nutrition | 600 mg | — | Capsule |
| Whey Protein Gold Isolate Plus Natural Vanilla Flavor | California Academy of Health | 504 mg | — | Powder |
| Cysteine 500 mg | Dr. Clark Store | 500 mg | — | Capsule |
| Hair Force | KAL | 500 mg | — | Capsule |
| L-Cysteine 500 mg | Puritan's Pride Premium | 500 mg | — | Capsule |
| L-Cysteine 500 mg | Vitamin World | 500 mg | — | Capsule |
| L-Cysteine 500 mg | Solaray | 500 mg | — | Capsule |
| L-Cysteine 500 mg | California Gold Nutrition | 500 mg | — | Capsule |
| L-Cystine | BulkSupplements.com | 500 mg | — | Powder |
| L-Cysteine 500 mg | LuckyVitamin | 500 mg | — | Tablet or Pill |
| L-Cysteine 500 mg | Douglas Laboratories | 500 mg | — | Capsule |
| L-Cysteine 500 mg | Lake Avenue Nutrition | 500 mg | — | Capsule |
| OptiCleanse Plus Rice Original | XYMOGEN | 463 mg | — | Powder |
| Whey Protein Gold Isolate Plus Natural Chocolate Flavor | California Academy of Health | 458 mg | — | Powder |
| Hair | Viva Vitamins | 400 mg | — | Tablet or Pill |
| Vita Chel Pack | Douglas Laboratories | 350 mg | — | Tablet or Pill |
| Vitamins For The Hair | Vitamin World | 334 mg | — | Other (e.g. tea bag) |
| Hair, Skin & Nails | CHK Nutrition | 300 mg | — | Tablet or Pill |
| Vita-Chel Plus | Douglas Laboratories | 300 mg | — | Tablet or Pill |
| Hepasil DTX | USANA | 225 mg | — | Tablet or Pill |
| Thyro-Dyne | InterPlexus Whole Body Health | 210 mg | — | Capsule |
| Hair, Skin, & Nail essentials | Healthy Choice Naturals | 200 mg | — | Capsule |
| Hair Effects | DaVinci Laboratories | 200 mg | — | Capsule |
| Ultra NourishHair Beauty Basics | GNC Women's | 200 mg | — | Other (e.g. tea bag) |
| Hair, Skin & Nails Beauty Basics | GNC Women's | 200 mg | — | Other (e.g. tea bag) |
| Ultra-Guard Low Allergenicity Antioxidant | Douglas Laboratories | 200 mg | — | Tablet or Pill |
| RootMD | Premium Certified | 200 mg | — | Capsule |
| Hair, Skin & Nails | Rite Aid Pharmacy | 200 mg | — | Tablet or Pill |
| Hair, Skin & Nails Formula | GNC Women's | 200 mg | — | Other (e.g. tea bag) |
| Anti-Oxidant | Ultimate Nutrition Platinum Series | 200 mg | — | Tablet or Pill |
| Liver Support | LES Labs | 200 mg | — | Capsule |
| Immunace | NaturesPlus | 200 mg | — | Tablet or Pill |
| Ultra Preventive Forte-Chel | Douglas Laboratories | 190 mg | — | Tablet or Pill |
| Ultra Preventive Forte-Chel (Capsules) | Douglas Laboratories | 190 mg | — | Capsule |
| Cardio Clear | Progressive Professional from Progressive Laboratories | 167 mg | — | Capsule |
| Amino Complex Lemon Flavored | Thorne | 150 mg | — | Powder |
| Redox | Douglas Laboratories | 150 mg | — | Capsule |
| Hair, Skin & Nails | Natural Factors WS WomenSense | 150 mg | — | Capsule |
| Immune Support | NaturesPlus | 150 mg | — | Tablet or Pill |
| Grey Hair Formula | SuperSmart | 150 mg | — | Capsule |
| Recancostat Powder Unflavored | Integrative Therapeutics | 140 mg | — | Powder |
| Lustre | Source Naturals | 133 mg | — | Tablet or Pill |
| PaleoCleanse Functional Detoxification Powder | Designs for Health | 125 mg | — | Powder |
| Hair & Nails Formula | SuperSmart | 120 mg | — | Capsule |
| Amino Fuel 1000 | Twinlab | 111 mg | — | Tablet or Pill |
| Fabulous Hair | Logos Nutritionals | 100 mcg | — | Tablet or Pill |
| GC-MSM 3550 | Progressive Professional from Progressive Laboratories | 100 mg | — | Capsule |
| Joint n-11 | Zenith Labs | 100 mg | — | Capsule |
| Hair revital x | Zenith Labs | 100 mg | — | Capsule |
| Men's Ultra Hair Plus | NaturesPlus | 100 mg | — | Tablet or Pill |
| Hair Renew Formula | Terry Naturally | 100 mg | — | Softgel Capsule |
| Liquid Hair Skin & Nails | Nature's Answer | 100 mg | — | Liquid |
| Ultra Hair | NaturesPlus | 100 mg | — | Tablet or Pill |
| Ultra Hair Plus with MSM | NaturesPlus | 100 mg | — | Tablet or Pill |
| Ultra NourishHair | GNC Men's | 100 mg | — | Other (e.g. tea bag) |
| Women's Ultra Hair Plus | NaturesPlus | 100 mg | — | Tablet or Pill |
| Hair Support | NaturesPlus AgeLoss | 100 mg | — | Tablet or Pill |
| Hair Revitalizing Formula | Swanson | 100 mg | — | Tablet or Pill |
| Nails | Viva Vitamins | 100 mg | — | Tablet or Pill |
| Viral-Protec | Xtendlife | 99 mg | — | Tablet or Pill |
| Immu-Stay | Xtendlife | 99 mg | — | Capsule |
| Oxi-Plus | Priority One Nutritional Supplements | 99 mg | — | Capsule |
| UltraCleanse Plus | Akasha Naturals | 85 mg | — | Powder |
| UltraClear Plus Natural Berry Flavor | Metagenics | 85 mg | — | Powder |
| UltraClear Plus Vanilla Flavor | Metagenics | 85 mg | — | Powder |
| UltraClear Plus pH Vanilla Flavor | Metagenics | 85 mg | — | Powder |
| Prenatal Core Minerals | USANA | 80 mg | — | Tablet or Pill |
| HealthPak | USANA | 80 mg | — | Other (e.g. tea bag) |
| Arthro-Syn | Douglas Laboratories | 75 mg | — | Capsule |
| Inflamzyme | Integrative Therapeutics | 75 mg | — | Tablet or Pill |
| Vision Maxx | DC | 60 mg | — | Capsule |
| OptiCleanse Plus Rice Raspberry Lemonade | XYMOGEN | 55 mg | — | Powder |
| Spectra | DaVinci Laboratories | 50 mg | — | Tablet or Pill |
| Spectra Without Copper And Iron | DaVinci Laboratories Of Vermont | 50 mg | — | Tablet or Pill |
| Total Balance Men's Premium | Xtendlife | 50 mg | — | Tablet or Pill |
| Nufolix | Pharmaxa Labs | 50 mg | — | Tablet or Pill |
| Total Balance Women's Premium | Xtendlife | 50 mg | — | Tablet or Pill |
| Cell Support | DaVinci Laboratories Of Vermont | 50 mg | — | Capsule |
| Maximum Hair | Supplement Spot | 50 mg | — | Tablet or Pill |
| Blood Pressure Support | NaturesPlus AgeLoss | 50 mg | — | Tablet or Pill |
| Total Balance Unisex Premium | Xtendlife | 50 mg | — | Tablet or Pill |
| Skin, Hair & Nails | Bronson Laboratories | 50 mg | — | Capsule |
| Hair, Skin & Nails | Dr. Rico Perez | 50 mg | — | Capsule |
| Beau-T | LifeSeasons Therapeutics | 50 mg | — | Capsule |
| Glucosamine Complex | Genestra Brands | 50 mg | — | Capsule |
| Ultra Man Max | Puritan's Pride | 50 mg | — | Other (e.g. tea bag) |
| Men's Vitality Complex | Esmond Natural | 50 mg | — | Tablet or Pill |
| Vegan Hair Nails & Skin | DEVA | 50 mg | — | Tablet or Pill |
| Genessentials OS-1 | DaVinci Laboratories Of Vermont | 50 mg | — | Capsule |
| Hair Vitamins | Rise-N-Shine | 50 mcg | — | Tablet or Pill |
| Spectra Man | DaVinci Laboratories | 50 mg | — | Tablet or Pill |
| Hema-Plex Tablets | NaturesPlus | 50 mg | — | Tablet or Pill |
| Spectra Woman | DaVinci Laboratories | 50 mg | — | Tablet or Pill |
| Hema-Plex Capsules | NaturesPlus | 50 mg | — | Capsule |
| CoQ10 Mitochondrial Energy Complex | NeoLife Nutritionals | 50 mg | — | Softgel Capsule |
| Hema-Plex Softgels | NaturesPlus | 50 mg | — | Softgel Capsule |