Kérastase Biotic is a collection of products designed to prevent scalp irritations from occurring by rebalancing & reactivating the scalp & hair's natural defences. This hydrating but purifying shampoo gently cleanses as it soothes, hydrates & rebalances the scalp. Formulated with bioflorine to rebalance & reactivate the scalp's microflora, glycerol to soothe & nourish, & silicon cationic polymers to nourish lengths. Itching & irritated scalps are nourished & soothed, & dry hair hydrated. Ideal for irritated scalps with dry hair.