SOURCE NATURALS - N-A-G 500 mg - 120 TabletsDESCRIPTION N A G???, N acetyl glucosamine, is an amino sugar (the building blocks of mucopolysaccharides). It is formed from L glutamine and glucose. N A G forms the basis of complex molecular structures which are key parts of the connective tissues and mucous membranes of the body tendons, ligaments, cartilage, bone matrix, skin, joint fluid, and intestinal lining. DETAILS Package Description: 120 Tablets Serving Size: 1 Tablet Number of Servings: