David Mallett Shampoo No.1: L'HYDRATATION provides optimal, dermatological cleaning. It opens hair cuticles to allow moisture to penetrate to the very core, locking it in with lasting results. The strength of Shampoo No.1: L'HYDRATATION lies in reducing the ingredients to only the necessary. With its light lather, it cleans normal and dry hair, particularly hair that has been damaged by frequent blow-drying, styling or chemical treatment. The main active ingredient in Shampoo No.1: L'HYDRATATION is a refined macadamia nut oil. It gently opens hair cuticles, enabling the penetration of moisture and beneficial nutrients into the hair. This helps to completely regenerate hair, restoring vitality and a healthy shine.