INCI · antioxidant · CIR review pending · used in 1 products
Cysteine(100 Ppm)
Cysteine (INCI: Cysteine) is a naturally occurring amino acid with the CAS number 52-90-4 / 3374-22-9 and chemical/IUPAC name L-Cysteine. According to CosIng, its official functions include antioxidant, antistatic, hair conditioning, hair waving or straightening, masking, and reducing. It is found across a range of hair care and skin care formulations.
Evidence level
weakEWG score
—Comedogenic
—Category
antioxidant● Benefits
Cysteine provides antioxidant protection and supports hair conditioning. It is also used in hair waving or straightening applications and has antistatic properties. Its reducing function makes it useful in bond-repair and structural hair treatments.
antioxidanthair-conditioninganti-static
● Cautions
