OLAPLEX No.4 is an everyday shampoo for all hair types. It is designed to be used in salons and at home. No.4 contains our single active ingredient, Bis-Aminopropyl Diglycol Dimaleate, which will help repair bonds as well as gently cleanse all types of hair. No.4 Imparts moisture, strength and manageability with every wash. OLAPLEX No.4 is Color-safe ,vegan and made without sulfates, parabens or gluten, OLAPLEX is never tested on animals.