Last reviewed May 2026 · 1 min read
Is E920 (L-Cysteine) vegan?
Also known as: L-Cysteine Hydrochloride, Cysteine
E-number: E920
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Source can be plant or animal.
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It depends — Often synthesized from poultry feathers or hog hair, though synthetic/microbial versions exist.
01 · The basics
What is E920 (L-Cysteine)?
A dough conditioner used in commercial bread baking.
02 · The source
Where it comes from
Often synthesized from poultry feathers or hog hair, though synthetic/microbial versions exist.
03 · Alternatives
Best vegan alternatives
Synthetic L-Cysteine
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Frequently asked
FAQ
Is E920 vegan?
E920 (L-Cysteine) can be sourced from animal products like poultry feathers or hog hair. However, synthetic and microbial versions also exist, so it's essential to check the label or contact the manufacturer.
What is E920 used for?
E920 is a dough conditioner used in commercial baking to improve the elasticity and workability of dough, resulting in softer, more consistent bread and pastries.
What are vegan alternatives to L-Cysteine?
Vegan alternatives to L-Cysteine include ascorbic acid (Vitamin C), enzymes like fungi-derived proteases, and certain plant-based proteins that can achieve similar dough conditioning effects.
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E422 (Glycerol / Glycerin)
A sweet, syrupy liquid used as a humectant in foods and cosmetics.
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E471 (Mono- and diglycerides)
A common emulsifier used in baked goods, ice cream, and margarine.
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