"Glucosamine is a compound widely studied as a chondro-protective agent. Chondrocytes are special cells found throughout the cartilage matrix, where they produce collagen and proteoglycans (one of the main components of cartilage). Glucosamine has gained wide recognition as a highly effective nutrient for the support and maintenance of healthy cartilage and joints. Glucosamine Sulfate (GS) is an aminomonosaccharide comprised of glucose and glutamine. Glucosamine is an essential component of and stimulant to the synthesis of proteoglycans, the building blocks of connective tissue and articular cartilage. Sulfur is also utilized in the production of cartilage tissue. "