Miscellaneous - Compounds used to treat Flour L-Cysteine from human hair is Haram. L-Cysteine from chicken feathers is not Halal. L-Cysteine from fermentation and synthetic source is Halal.
MailOfIslam.com : Mushbooh, Haraam if it is obtained from human hair, Halal if it is made from Halal synthetic material. The third source is from chicken/duck feathers. There is difference of opinions among different Islamic scholars. One school of ulema says it is Halal the other says not Halal.
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