Introducing a form of glucosamine that delivers effective support for comfortable joint and GI tract function: Swanson N-Acetyl D-Glucosamine. A polysaccharide made up of glucosamine and acetic acid, N-acetyl D-glucosamine is a key constituent of the hyaluronic acid that lubricates joint surfaces, but its benefits go beyond joint health. It is also a crucial component of the glycoproteins in the protective mucosal layer of the intestinal tract, making it a valuable nutrient for maintaining comfortable gastrointestinal function.