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Cheapest L-Cystine on iHerb

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

Prices updated Jul 25, 2026 · 8 products · Prices in USD

The priciest option here costs about 8.2× more per mg of L-Cystine than the best-value pick Nature's Answer. For the same daily dose, choosing by cost per unit instead of sticker price can meaningfully cut your yearly spend.
#ProductDoseServingsPrice (USD)Cost per mg
1
Nature's Answer, Brewer's Yeast , 16 oz (454 g)
Nature's Answer, Brewer's Yeast , 16 oz (454 g)
Nature's Answer
90 mg1514.240.011View on iHerb →
2
Thorne, Amino Complex, Berry, 30 Stick Packs, 0.27 oz (7.7 g) Each
Thorne, Amino Complex, Berry, 30 Stick Packs, 0.27 oz (7.7 g) Each
Thorne
150 mg3056.000.012View on iHerb →
3
Thorne, Amino Complex, Lemon, 30 Stick Packs, 0.28 oz (7.8 g) Each
Thorne, Amino Complex, Lemon, 30 Stick Packs, 0.28 oz (7.8 g) Each
Thorne
150 mg3056.000.012View on iHerb →
4
Country Life, Max-Amino Caps with Vitamin B6, 90 Vegetarian Capsules
Country Life, Max-Amino Caps with Vitamin B6, 90 Vegetarian Capsules
Country Life
40 mg2214.390.016View on iHerb →
5
DaVinci Laboratories, Amino 21, 750 mg, 90 Capsules
DaVinci Laboratories, Amino 21, 750 mg, 90 Capsules
DaVinci Laboratories
23 mg9036.000.018View on iHerb →
6
Bluebonnet Nutrition, Amino Acid , 750 mg, 180 Vegetable Capsules
Bluebonnet Nutrition, Amino Acid , 750 mg, 180 Vegetable Capsules
Bluebonnet Nutrition
60 mg4548.760.018View on iHerb →
7
Country Life, Max-Amino Caps with Vitamin B-6, 180 Vegetarian Capsules
Country Life, Max-Amino Caps with Vitamin B-6, 180 Vegetarian Capsules
Country Life
40 mg4532.690.018View on iHerb →
8
Qualia, Mitochondria+, 120 Capsules
Qualia, Mitochondria+, 120 Capsules
Qualia
100 mg15129.000.086View on iHerb →

How we rank L-Cystine

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.