Cocamidoproply betaine is made of fatty acids derived from coconut oil.  Used as an additive to increase the effectiveness of other ingredients.  Cocamidopropyl Betaine produces a thick lather when combined with water. The lather helps to loosen the dirt and impurities so they are easier to rinse off after cleaning.  Many detergents are drying to hair or skin. Cocamidopropyl betaine contains coconut oil, which is hydrating to skin and hair.