N-a-g, 700mg - 120 VcapsN Acetyl Glucosamine (N A G) is a precursor to hyaluronic acid, which is part of the synovial fluid in joints.* N A G combines with mucin secreted from goblet cells to support the glycocalyx, a protective layer of glycoproteins and polysaccharides that lines the digestive tract.* N A G is an aminosaccharide, synthesized from glucose and the amino acid L glutamine, that has been stabilized by complexing it to an acetyl group.