Glucosamine is produced naturally in the body, although there are no major food sources of this substance. A major structural component within joint tissue of cartilage, tendons and ligaments and is the starting point of the synthesis of several important macromolecules including glycoproteins, glycolipids and glycosaminoglycans. These macromolecules can be found in the synovial fluid, cartilage, tendons, ligaments and muscles. Where is it found? Glucosamine is not present in significant amounts in most diets. Supplemental sources are derived from the shells of shrimp, lobster, and crab. Each ZipVit capsule contains a huge 1500mg of Glucosamine Sulphate to supplement the natural occurring Glucosamine found in your cartilage. The quality of this product over our competitors\' product is reflected in our huge sales figures... this is now one of our number one selling lines. We believe it is one of the most effective supplements available