Sodium Cocoyl Isethionate Sodium Cocoyl Isethionate is a mild, high foaming anionic surfactant with high purity. It exhibits excellent foam density, foam stability, lime soap dispersion and surface activity. Being hard water tolerant, it leaves no soap scum. It is compatible with soaps and anionic, non-ionic, and amphoteric surfactants. Due to its anionic character, it should not be used with cationic components like cationic surfactants, cationic dyes, etc. This is one of the gentlest surfactants on the market and works well even in hard water. Made from renewable coconut fatty acids and fully biodegradable, it is gentle enough to use in products for babies and personal cleansers such as eye-makeup removers. Having little scent, it will not tend to trigger fragrance allergies.