Glucosamine is an amino - monosaccharide that naturally occurs in all tissues, particularly in articular cartilage of joints and from the biosynthesis of glucose. (en.wikipedia.org)
Prolotherapy involves injections of proliferant solutions directly into areas where tendons and ligaments attach to bone, and in places where cartilage is worn or damaged for the purpose of repairing and strengthening tendons, ligaments and cartilage of the joint space. (kontinuumnaturopathic.com)
But glucosamine is an aminosugar that is incorporated into the articular cartilage of the joint, helping it to repair itself. (petpeoplesplace.com)