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l cysteine as far as I know is an amino acid...found in human hair etc.....used to bond certain chemicals etc but I believe since this amino acid is found in food a few years back they outlawed the use of it unless it was scientifically engineered etc....so now they make it in a lab and they no longer use human hair...as far as I know....

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12y ago
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Q: What is L-Cysteine Hydrochloride?
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