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Cheapest L-Cysteine on iHerb

Ranked by real cost per 100 mg of L-Cysteine — cheapest value first.

Prices updated Jul 25, 2026 · 25 products · Prices in USD

The priciest option here costs about 69.5× more per 100 mg of L-Cysteine than the best-value pick Nutricost. For the same daily dose, choosing by cost per unit instead of sticker price can meaningfully cut your yearly spend.
#ProductDoseServingsPrice (USD)Cost per 100 mg
1
Nutricost, L-Cysteine, 120 Capsules (500 mg per Capsule)
Nutricost, L-Cysteine, 120 Capsules (500 mg per Capsule)
Nutricost
1,000 mg6014.950.025View on iHerb →
2
Source Naturals, L-Cysteine, Free Foam Powder, 3.53 oz (100 g)
Source Naturals, L-Cysteine, Free Foam Powder, 3.53 oz (100 g)
Source Naturals
900 mg8318.770.025View on iHerb →
3
Lake Avenue Nutrition, L-Cysteine, 500 mg, 90 Veggie Capsules
Lake Avenue Nutrition, L-Cysteine, 500 mg, 90 Veggie Capsules
Lake Avenue Nutrition
500 mg9014.620.033View on iHerb →
4
California Gold Nutrition, L-Cysteine, AjiPure®, 500 mg, 60 Veggie Capsules
California Gold Nutrition, L-Cysteine, AjiPure®, 500 mg, 60 Veggie Capsules
California Gold Nutrition
500 mg6013.720.046View on iHerb →
5
Super Nutrition, Multivitamins with L-Cysteine, MSM, Vitamin A, and Biotin, 180 Tablets
Super Nutrition, Multivitamins with L-Cysteine, MSM, Vitamin A, and Biotin, 180 Tablets
Super Nutrition
300 mg6024.850.138View on iHerb →
6
KAL, Hair Force™, 60 VegCaps
KAL, Hair Force™, 60 VegCaps
KAL
500 mg2019.390.194View on iHerb →
7
World Organic, HAIR-NU, 120 Tablets
World Organic, HAIR-NU, 120 Tablets
World Organic
100 mg6019.610.327View on iHerb →
8
LifeTime Vitamins, Supreme Vital Hair with MSM, 120 Capsules
LifeTime Vitamins, Supreme Vital Hair with MSM, 120 Capsules
LifeTime Vitamins
200 mg3021.290.355View on iHerb →
9
Solaray, Hair Nutrients With L-Cysteine, 60 VegCaps
Solaray, Hair Nutrients With L-Cysteine, 60 VegCaps
Solaray
100 mg3011.090.370View on iHerb →
10
D'adamo, Deflect® B, Lectin Blocking Formula, 120 Vegetarian Capsules
D'adamo, Deflect® B, Lectin Blocking Formula, 120 Vegetarian Capsules
D'adamo
200 mg6051.950.433View on iHerb →
11
KAL, Eye Formula Plus™, 60 Tablets
KAL, Eye Formula Plus™, 60 Tablets
KAL
180 mg1521.590.800View on iHerb →
12
Source Naturals, Wellness D-mmunity™, 60 Vegetarian Capsules
Source Naturals, Wellness D-mmunity™, 60 Vegetarian Capsules
Source Naturals
50 mg3012.420.828View on iHerb →
13
Codeage, Sport, Liposomal Multi Amino+ Powder, Unflavored, 6.15 oz (174.2 g)
Codeage, Sport, Liposomal Multi Amino+ Powder, Unflavored, 6.15 oz (174.2 g)
Codeage
150 mg3039.990.889View on iHerb →
14
Codeage, Liposomal Multi Amino+, Sport, 240 Vegetable Capsules
Codeage, Liposomal Multi Amino+, Sport, 240 Vegetable Capsules
Codeage
150 mg3044.991.000View on iHerb →
15
Dr. Mercola, Whole-Food Complex with added Multivitamin plus Vital Minerals, For Women, 240 Tablets
Dr. Mercola, Whole-Food Complex with added Multivitamin plus Vital Minerals, For Women, 240 Tablets
Dr. Mercola
150 mg3054.991.22View on iHerb →
16
Terry Naturally, Hair Renew Formula®, 60 Softgels
Terry Naturally, Hair Renew Formula®, 60 Softgels
Terry Naturally
100 mg3039.961.33View on iHerb →
17
DaVinci Laboratories, Spectra , 240 Tablets
DaVinci Laboratories, Spectra , 240 Tablets
DaVinci Laboratories
50 mg12082.701.38View on iHerb →
18
DaVinci Laboratories, Spectra Woman, Multiple Vitamin/Mineral, 240 Tablets
DaVinci Laboratories, Spectra Woman, Multiple Vitamin/Mineral, 240 Tablets
DaVinci Laboratories
50 mg12086.581.44View on iHerb →
19
DaVinci Laboratories, Spectra Man, Multiple Vitamin/Mineral, 240 Tablets
DaVinci Laboratories, Spectra Man, Multiple Vitamin/Mineral, 240 Tablets
DaVinci Laboratories
50 mg12089.121.49View on iHerb →
20
The Vitamin Shoppe, Amino Acid Complex, 100 Tablets
The Vitamin Shoppe, Amino Acid Complex, 100 Tablets
The Vitamin Shoppe
72 mg2527.991.56View on iHerb →
21
DaVinci Laboratories, Spectra , 120 Tablets
DaVinci Laboratories, Spectra , 120 Tablets
DaVinci Laboratories
50 mg6047.801.59View on iHerb →
22
DaVinci Laboratories, Spectra Woman, Multiple Vitamin/Mineral, 120 Tablets
DaVinci Laboratories, Spectra Woman, Multiple Vitamin/Mineral, 120 Tablets
DaVinci Laboratories
50 mg6049.701.66View on iHerb →
23
Lemme, Grow, Hair Growth & Anti-Shedding, 60 Capsules
Lemme, Grow, Hair Growth & Anti-Shedding, 60 Capsules
Lemme
100 mg3050.001.67View on iHerb →
24
DaVinci Laboratories, Spectra Man, 120 Tablets
DaVinci Laboratories, Spectra Man, 120 Tablets
DaVinci Laboratories
50 mg6050.621.69View on iHerb →
25
D'adamo, Deflect® A, Lectin Blocking Formula, 120 Vegetarian Capsules
D'adamo, Deflect® A, Lectin Blocking Formula, 120 Vegetarian Capsules
D'adamo
50 mg6051.951.73View on iHerb →

How we rank L-Cysteine

Two supplements can list the same dose per serving yet cost very differently once you account for how many servings are in the bottle. We calculate the total nutrient in each container (dose per serving × servings per container), divide the current price by that total, and rank by the resulting cost per unit. Lower is better. Because prices are refreshed automatically, this ranking reflects today's iHerb pricing rather than a snapshot from months ago.

Cost per unit is a starting point, not the whole story — the ideal form, third-party testing, and other ingredients matter too. Always check the label and consult a healthcare professional before starting a supplement.

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Prices update automatically and may differ from iHerb at checkout. Rankings are based on cost per unit of the listed nutrient and are for informational purposes only — not medical advice. Links to iHerb are affiliate links.