Ingredient

I-cysteine

Source
Animal-derived
Allergen
No
Role in food
Manufacturers use L-cysteine as a dough conditioner in baked goods, like breads and pizza …

What is I-cysteine?

L-cysteine is a non-essential amino acid, meaning the body can produce it. It is found naturally in protein-rich foods. Commercially, it is often produced through fermentation or by extracting it from animal sources like feathers or hair.

Is I-cysteine vegan?

No. I-cysteine is animal-derived, so it is not vegan.

Is I-cysteine gluten-free?

It does not contain gluten.

Is I-cysteine a major allergen?

L-cysteine is not derived from any of the 9 major allergens.

What is I-cysteine used for?

Manufacturers use L-cysteine as a dough conditioner in baked goods, like breads and pizza dough.

Is I-cysteine safe?

L-cysteine is generally recognized as safe (GRAS) by the FDA when used as a food ingredient.

Why it's used

Manufacturers use L-cysteine as a dough conditioner in baked goods, like breads and pizza dough. It helps improve dough texture and reduce mixing time. It can also be used as a flavor enhancer.

Health notes

L-cysteine is generally recognized as safe (GRAS) by the FDA when used as a food ingredient. It is a building block for proteins and plays a role in various bodily functions. International bodies like JECFA have evaluated L-cysteine. Evidence does not suggest adverse health effects from typical dietary intake.

Allergen info

L-cysteine is not derived from any of the 9 major allergens. It does not contain gluten.

Foods that contain I-cysteine

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Auto-generated content. This description was generated automatically and is pending editorial review. Inaccuracies are possible. Found a mistake? Contact us.

Last updated: September 28, 2026

Note: This site presents label data from USDA FoodData Central for general information. It is not medical advice. Check the package label; formulations change.