L-Cystine is an amino acid added to breads and other baked products. Most of l-cysteine produced in the US is made from human hair. One donut manufacturer said its l-cysteine is made from chicken feathers. Would bread containing l-cysteine made from chicken feathers be halal to eat?
Answer
If L-Cystine is made from chicken feathers then it will be halaal and if
made from human hair then it will not be halaal.
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai