N-Acetyl Glucosamine is an aminosaccharide, synthesized from glucose and the amino acid L-glutamine, that has been stabilized by complexing it to an acetyl group. N-Acetyl Glucosamine is the body\'s precursor to hyaluronic acid, which is part of the synovial fluid that lubricates joints. N-A-G combines with mucin secreted from goblet cells to form the glycocalyx, a protective layer of glycoproteins and polysaccharides that lines the digestive tract. N-Acetyl Glucosamineis the versatile form of glucosamine for joint and intestinal tissue.Contains shellfish.