Amino-monosaccharide that is a component of chitin, mucopolysaccharides and mucoproteins which is synthesized naturally in the body, found in cartilage, tendons and ligaments.Very abundant in seafood.It is used, without clearly scientific evidence of its efficacy, as an adjuvant treatment of osteoarthritis.N-acetylglucosamine is a derivative of glucosamine which is found naturally in breast milk. At latest update published were not found data on excretion in breast milk. Its low bioavailability and rapid disappearance of the plasma stream makes it unlikely the pass into milk in significant amounts. It is a natural product with a very low toxic potential.