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Sodium hyaluronate or Hyaluronic acid (HA) is one kind of polysaccharides composed of repeat disaccharide units of N-acetyl glucosamine and glucuronic acid Commercial HA is commonly its sodium salt form. Sodium hyaluronate is the key water maintaining substances in human skin. Bad living environment and aging can cause the decrease of HA content in skin, and as a result the water maintaining ability of the skin is weakened and the akin looks dry and rough. One of the main causes of skin senility is also the decrease of polysaccharides, such as HA. The special structure characteristic of HA makes it has high moisturizing and water content regulating function and its solution has high viscous elasticity and lubricity. When HA solution is applied on the surface of skin, it can form an air permeable layer and keep the skin moist and smooth. Small molecular weight HA can penetrate into dermis layer, fully combine with water, promote skin blood microcirculation and nutrient absorption and maintain normal metabolism, and as a result it plays a role of wrinkle removing, look improving and health protecting.
Topical grade HA can be used in many kinds of cosmetics, such as cream, milk, water shampoo, lotion, etc. HA is one of the best natural moisturizing components used in cosmetics
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