TypeFlour treatment agent
Comes fromFeathers, pig bristles, hair, or fermentation.
Names on labels2
Names to look for on labels
- cysteine
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 l-cysteine halal?
L-cysteine is doubtful (mushbooh). Halal only if fermented or from a halal source.
Where does l-cysteine come from?
Feathers, pig bristles, hair, or fermentation.
Last reviewed 2026-10-06. How we decide · Suggest a correction