Ectoine (CAS# 96702-03-3) is a cyclic amino acid produced by organisms exposed to extreme drought, temperatures, and heat. A bacteria-derived extremolyte, it provides defense against environmental stressors. Well-researched and widely used in cosmetics, Ectoine is an antioxidant and humectant with strong water-binding properties. It improves skin hydration, reduces dryness, and diminishes visible signs of aging. Used in cleansing agents, it reduces irritation and enhances safety.