Glucosamine Sulfate is a well-known joint support ingredient. Glucosamine is an essential building block for the formation of glycosamino glycans GAGs and proteoglycans the main components of cartilage tissue.These compounds attract water to form a joint cushion providing lubrication and shock absorption. NOW Foods developed the glucosamine test method chosen as the officialChondroitin is a naturally occurring compound found in the connective tissues which lubricates and cushions joints. Glucosamine is natures basic building block for maintaining joint cartilage and helps to maintain structural integrity of the connective tissues of your joints.