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L-cysteine is a sulfur-containing amino acid found in protein-rich foods and produced by the body. It is a key component in the synthesis of keratin, a protein vital for hair structure.
Key insights:
- The in vitro evidence suggests that the amount of cysteine present in the hair fiber is an indicator of hair health.
- The in vivo (in animal) evidence suggests that L-cysteine and Vitamin B6 (which assist in L-cysteine incorporation) can inhibit the onset of alopecia in mice exposed to environmental cigarette smoke.
- There do not appear to be any clinical studies associating L-cysteine with hair follicle growth.
- Our experience tracking members: L-cysteine alone is not enough to improve hair loss outcomes
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