Glucosamine is a building block of cartilage and joint tissue chondroitin is the tough connective tissue within joints msm is a natural form of organic sulphur one of the major building blocks of glycosaminoglycans key components of cartilage these tablets contain a high strength blend of glucosamine and chondroitin with msm glucosamine and chondroitin are naturally found in the joints of the body rarely found in natural food sources glucosamine is a building block of cartilage