Key Cosmetic Benefits of Sodium Cocoyl Isethionate Gentle Cleansing Creamy Lather Moisture Retention Mild on Eyes and ScalpSodium Cocoyl Isethionate (SCI) is a gentle, sulfate-free surfactant derived from coconut oil. It is widely used in cosmetic products—especially in cleansers, shampoos, and bath products—for its ability to create a rich, creamy lather while being non-drying and mild on the skin.