OLAPLEX Scalp Longevity Treatment is a weightless leave-in serum for all scalp and hair types. It immediately hydrates and soothes the scalp while helping strengthen its barrier and balance its microbiome. A proprietary complex replenishes lipids with essential fatty acids and ceramides to nourish a dry scalp. An antioxidant blend helps protect against free radicals and accelerated scalp aging. By supporting the scalp environment, the treatment promotes hair that looks soft, shiny, and healthy. It is dermatologist tested, trichologist approved, color-safe, vegan, and suitable for chemically treated hair.