Cetyl Betaine is a humectant, which means that it helps keep moisture inside your skin cells. This is one of the best betaine skin benefits. Not only that, but betaine is also an “osmolyte,” which means it can help your skin adapt to both moisture losses and gains. Betaine helps keep the skin healthy and hydrated without excess oiliness. In general, betaines are known to possess multifunctional properties in personal care hair and skin cleansing products including: viscosity building, foam volume enhancement, foam stability, improved skin and eye mildness and skin feel.