nutrient
Cystine in food data
The sulfur-containing amino-acid field labelled cystine in USDA food data.
Educational draft · Human scientific and editorial review pending. About review status
USDA’s amino-acid methods name cystine explicitly. The recipe calculator retains that label instead of relabelling the amount as cysteine.
How it works
What this field means
USDA’s amino-acid methods name cystine explicitly. The recipe calculator retains that label instead of relabelling the amount as cysteine.
Related topics
Cystine in food data is reported within Protein
Cystine is reported in the food amino-acid profile rather than added to total protein.
Evidence: Established · Source checked 2026-09-16 · Sources: USDA Agricultural Research Service: Standard Reference Release 28: Documentation and User Guide — nutrient definitions
Worth knowing
Reading it in a recipe. Amino-acid rows describe parts of the protein record. They are not additional grams of protein to add to the protein total, and this app does not derive a cystine target.
A closer look
Follow the ingredient record
Open an ingredient to see the exact food description, preparation state and per-100 g values. A known subtotal means at least one ingredient value is missing; it is not a complete total.
References
Source-checked local draft.
Human editorial review pending.
- USDA Agricultural Research Service (opens in new tab)Standard Reference Release 28: Documentation and User Guide — nutrient definitionsChecked 2026-09-16
- U.S. Department of Agriculture, Agricultural Research Service (opens in new tab)FoodData Central SR Legacy, April 2018 JSON releaseChecked 2026-09-05
Take it into the kitchen
Explore this nutrient in simple meals. Recipe pages show estimated amounts and missing data.
Pineapple cashew chicken pan · 25 min →
Chicken cabbage ginger rice · 20 min →
Chicken corn tortilla fold · 20 min →
Compare meals by cystine in food data →