D-Glucosamine 
 D-glucose by an amino, a hydroxy-substituted compounds. Formula C6H13O5N, commonly known as amino sugar. Widespread in nature, 2 - amino -2-- deoxy-D-glucose is usually N-acetyl derivatives (such as chitin) or N-sulfate and N-acetyl-3-O-lactic acid ether (muramic acid ) exists in the form of micro-organisms, animal sources of polysaccharides and polysaccharide with α-amino-glucose as needle crystal, melting point 88 ℃, specific rotation +100 ° → 47.5 ° (water); β-type for the needle crystal, melting point 110 ℃ (decomposition), +28 ° → +47.5 ° (water); soluble in water. 2 - amino -2-- deoxy-D-glucose is a component variety of antibiotics. Also known as D Glucosamine Glucosamine, which is the body synthetic substances, is an important nutrient to form cartilage cells, a healthy natural tissue components of articular cartilage. With age, the human body more and more serious lack of glucosamine, the degradation of articular cartilage and wear. United States, Europe and Japan show that a large number of medical research: Glucosamine helps repair and maintain cartilage and stimulate cartilage cell growth.