Hyaluronic acid acts on the surface of the skin, large molecules of hyaluronic acid can form a layer of breathable film on the surface of the skin, small molecules of hyaluronic acid can penetrate into the dermis, with a slight expansion of the capillaries, increase blood circulation, improve the middle of the metabolism, and promote the role of the skin's nutrient absorption, with a strong wrinkle reduction function, which increases the skin's elasticity, and slows down the aging of the skin. Hyaluronic acid can also promote the proliferation and differentiation of epidermal cells, remove oxygen free radicals, can prevent and repair skin damage. The aqueous solution of hyaluronic acid has high viscosity, which can thicken the water phase; the paste after emulsification with the oil phase is even and delicate, and it has a stabilizing emulsification effect. Hyaluronic acid is the best natural moisturizing ingredient for high-grade cosmetics, it is compatible and can be added to almost any beauty cosmetic, widely used in creams, lotions, lotions, serums, cleansers, baths, shampoos and hair extensions, mousse, lipstick and other cosmetic products, the general additive amount of 0.05% -0.5%.