Glucosamine (N-acetyl-D)N-acetyl glucosamine is an amino-monosaccharide that acts as a substrate precursor for hyaluronic acid (HA) as well as proteoglycans synthesis. N-acetyl-glucosamine has demonstrated various benefits to the skin, such as enhancing hydration, reducing wrinkles, and accelerating wound healing. When combined with Niacinamide it is very effective in reducing age spots and hyperpigmentation, as well as improving skin tone and correcting other problems with uneven pigmentation of the skin. It is also used in skin care for sun damage repair and to boost natural hyaluronic acid production.