Last reviewed May 2026 · 1 min read
Is L-Cysteine (E920) vegan?
Also known as: E920
E-number: E920
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Source can be plant or animal.
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It depends — Traditionally extracted from duck feathers or hog hair.
01 · The basics
What is L-Cysteine (E920)?
An amino acid used to improve the texture of commercial bread dough.
02 · The source
Where it comes from
Traditionally extracted from duck feathers or hog hair. Vegan versions exist but are more expensive. Verification is needed.
03 · Alternatives
Best vegan alternatives
Ascorbic acid
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Frequently asked
FAQ
Is E920 vegan?
Unless labeled vegan, E920 is very likely derived from animal hair or feathers.
Commonly found in
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Calcium Gluconate
A firming agent and acidity regulator.
Chitin
A fibrous substance consisting of polysaccharides, used in agriculture, winemaking, and dietary supplements (for weight loss).
Chitosan
A linear polysaccharide derived from chitin, heavily marketed in supplements as a 'fat binder' for weight loss.
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Related ingredients
E422 (Glycerol / Glycerin)
A sweet, syrupy liquid used as a humectant in foods and cosmetics.
E920 (L-Cysteine)
A dough conditioner used in commercial bread baking.
Calcium Carbonate
A common mineral used as a white food coloring, an anti-caking agent, and a calcium supplement.
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