Why is cocamidopropyl betaine in skin cleansers?
Cocamidopropyl betaine is a surfactant that comes from coconut oil, and it’s a common ingredient in many liquid skin cleansers [source: Reitschal]. Surfactants are detergents that allow water to wash away the oil and dirt from your skin by decreasing the surface tension of water and making it easier to wet your face. Surfactants are both lipophilic — oil loving — and hydrophilic — water loving — which enables them to remove dirt and oil from your skin. Some surfactants are harsher on skin than others, but cocamidopropyl betaine typically doesn’t cause irritation [source:
