NAG N-Acetyl Glucosamine 500mg 120 tabs from Source NaturalsN A G N Acetyl Glucosamine 250 mg and 500 mg N acetyl glucosamine, an amino sugar, forms the basis of complex molecular structures that are key parts of the connective tissue and mucous membranes of the body: tendons, ligaments, cartilage, bone matrix, skin, joint fluid, and intestinal lining. Glucosamine is the fundamental molecular building block of the macromolecules that attract and hold water in cartilage. Your body makes glucosamine, but under