L-cysteine is mostly made from human hair, chicken or duck feathers, boar bristles etc., or it can be synthetic. I would like to know if it is halal, since it can be found in many bakery products such as bread, pizza dough, bagels, donuts etc.
Is L-cysteine halal?
Yes, it is.
What is L-cystiene?
Cysteine (abbreviated as Cys or C) is an α-amino acid with the chemical formula HO2CCH(NH2)CH2SH. It is a semi-essential amino acid, which means that it can be biosynthesized in humans.
P.S Biosynthesized meansthe following - Biosynthesis (also called biogenesis) is an enzyme-catalyzed process in cells of living organisms by which substrates are converted to more complex products.
or in brief it is produced in our body (this is one proof that it is halal).Cysteine can usually be synthesized by the human body under normal physiological conditions if a sufficient quantity of methionine is available. Cysteine is catabolized in the gastrointestinal tract and blood plasma.
Where is is used? Where is it found?
Although classified as a non-essential amino acid, in rare cases, cysteine may be essential for infants, the elderly, and individuals with certain metabolic disease or who suffer from malabsorption syndromes. (2nd proof of being halal)
Cysteine is found in most high-protein foods, including:
Animal sources:- Sausage meat, chicken, turkey, duck, luncheon meat, eggs, milk, whey protein, ricotta, cottage cheese, yogurt.
Plant sources:- Red peppers, garlic, onions, broccoli, brussels sprout, oats, granola, wheat germ. (3rd proof of being halal. As these food stuff are halal and they occur naturally in these foods then it has to be halal.)
Note- Im not a biology student so this information is not from me but from wikipedia.
Another thing to note is that L-cystiene is the same as cystiene. Well actually along with L-cystiene there also exists D-cystiene. They both are same to cystiene. Their chemical properties are similar but their physical properties might not be similar. i know this because i am a chemistry student.