Halal Certified L-Cystine
Halal L-Cystine E921
Halal L-Cystine E921 is an amino acid manufactured through fermentation. As a synthesized chemical, this amino acid is general recognized as halal. L-Cystine E921 is mostly made from human hair, chicken or duck feathers, boar bristles etc., or it can be synthetic. It is halal and can be found