Product Details The Ordinary's concentrated Multi-Peptide Serum is designed to support hair health so that it looks thicker denser fuller and healthier. It brings together a cocktail of effective peptides natural extracts and high-solubility caffeine in an ultra-lightweight emollient base for efficient penetration to the hair and scalp. The total concentration of these technologies in the formula by weight is 21.15%. How To Use Apply a few drops or as needed once daily ideally at bedtime to clean dry scalp. Massage into scalp thoroughly. This formula is a leave on/in treatment. Do not wash hair or scalp after application.