EXPLORE A NUTRIENT

Cystine

Discover how amounts vary across foods, on a shared basis for comparison.

An individually reported amino acid. The reference depicts L-cystine. [1] [2]

L-cystine — 2D chemical diagram — **Depicted form: L-cystine**
This reference form does not represent every form included in the USDA quantity.
Description, source and attribution
Reference depiction: L-cystine. Formula C6H12N2O4S2; PubChem CID 67678; charge 0. This specified form does not represent every form or molecule included in the USDA quantity.
PubChem Compound 67678, 2D Structure. NCBI / National Library of Medicine. Source · Reuse terms
Source check: 2026-09-13 · No scientific editorial review.

A COMMON BASIS

Foods, per 100 g

100 g

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61 foods with data 45 not reported, excluded from ranking

Chicken breast
Roasted chicken breast, meat only, without skin; seasoning not specified.
0.397 g
Duck meat
Domesticated duck, roasted, meat only, without skin.
0.361 g
Sesame seeds
Whole dried sesame seeds.
0.358 g
Flaxseed
Flaxseed; source does not specify grinding.
0.34 g
Lamb leg
Roasted lamb whole leg, shank and sirloin, separable lean only, choice, trimmed to 1/4 inch fat.
0.338 g
Pumpkin seeds
Dried pumpkin/squash seed kernels, without shells.
0.332 g
Goat meat
Goat meat, roasted, as classified by USDA under game meat.
0.323 g
Blue mussels
Blue mussels, cooked with moist heat.
0.312 g
Peanuts
Peanuts, all types, dry-roasted without salt.
0.304 g
Pork tenderloin
Roasted pork tenderloin, separable lean only; seasoning not specified.
0.302 g
Egg
Whole egg, hard-boiled.
0.292 g
Turkey breast
Roasted turkey breast from retail parts, meat only; seasoning not specified.
0.283 g

All results are sorted before pagination. Bars compare amounts within this search; they do not indicate health benefits. Not reported does not mean zero.

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UNDERSTAND THE DATA

The nutrient, in context

How to read this ranking

This page compares Cystine (Cystine), in g per 100 g of food.

Chemical forms and measurement methods remain separate. “Not reported” means a value is unavailable, not that the food contains zero. A food’s rank does not determine your individual needs or diagnose a deficiency.

Intake guidance

There is no validated NIH ODS fact sheet for this identity in Bitameans’ published version. We do not assign another nutrient’s recommendations to this form. An absent fact sheet does not mean that no upper intake limit exists.

Browse the NIH ODS fact-sheet directory

Identity and structure sources

PubChem Compound 67678: (-)-Cystine · Accessed 2026-09-13
USDA FoodData Central: Foundation Foods Documentation · Accessed 2026-09-13

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