Ectoine is a natural cyclic amino acid that intensely moisturizes the scalp. It helps restore balance to irritated scalp and has antioxidant properties. In trichology, ectoine is used in scalp and hair care for irritation, dryness, or weakened hair structure. Ectoine binds water and creates a film on the skin that retains moisture, improving hydration levels. It reduces transepidermal water loss (TEWL), improving the skin's barrier function. Ectoine creates a protective layer on the hair that protects it from damage caused by UV radiation, pollution, and styling (e.g., heat from a hairdryer or straightener).