E-Codes & Additives Is L-Cysteine (E920) Halal? The Bread Additive With a Hidden Source
L-cysteine (E920) in bread can be derived from human hair, duck feathers, or synthetic production. Human hair source is haram. Synthetic E920 is halal. Here's how to tell.
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#food-additives
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April 19, 2026 6 min read 
