ABSTRACT Betaine surfactant is an amphoteric surfactant containing both positive and negative ions in its hydrophilic portion. Betaine surfactant is an industrial product. It is used as a foam enhancer and as an ingredient in various skincare products, such as shampoo, shower gel, and cosmetics, and is safe for sensitive skin. Surfactant production in Indonesia reaches 70,000 tons per year, wh…