Keratin is a substance that coats the hair and, therefore, closes the split ends and creates an outer protective layer that wraps and softens the hair. The serum is designed for hair that has been softened in all methods and for hair that is heat styled. Increases hair resistance to breakage and maintains straightening results, restores split ends, protects static electricity and adds shine. Enriched with keratin, argan oil, jojoba oil, macadamia oil, omega 6 and vitamins E and B5.