What is E920?
E920 is L-cysteine, a flour treatment agent. Halal if made by fermentation or from halal poultry feathers; the source is rarely stated. Found in some bread and bakery products.
Also written as: INS 920, E-920, E 920, cysteine. INS is the international numbering system used outside Europe, including on labels in Asia, Australia and the Middle East.
What to do
Look for a halal logo, a "vegan" label, or a stated plant source on the pack. If none of these are present, you can contact the manufacturer and ask for the source.
Frequently asked questions
Is E920 halal?
E920 (L-cysteine) is doubtful (mushbooh). Halal if made by fermentation or from halal poultry feathers; the source is rarely stated. Found in some bread and bakery products.
What is E920 made from?
Duck feathers, pig bristles, human hair, or fermentation.
What is E920 used for?
E920 is used as a flour treatment agent, typically in bread, rolls and bakery products.
What should I do if a product contains E920?
Look for a halal logo, a "vegan" label, or a stated plant source on the pack. If none of these are present, you can contact the manufacturer and ask for the source.
Related E-numbers
Last reviewed 2026-10-06. How we decide · Suggest a correction