Chondroitin sulfate (Chondroitinsulfate) exists in animal cartilage in great quantities, goods is extracted from animal tissue preparation of acid mucopolysaccharide. Chondroitin sulfate is a kind of sugar glycosaminoglycans, by D - glucuronic acid and N - acetyl galactosamine beta 1, 4 - glycosidic bond connection and repeat disaccharide unit composed of polysaccharides, and the N - b chondroitin sulfate acyl galactosamine or four C - C - 6 hydroxy acid esterification. Consists of chondroitin sulfate sodium and calcium chondroitin sulfate salt, etc., mainly used in arthritis, eye drops, etc. As a drug in the treatment of joint diseases, often used with glucosamine, with pain, promote cartilage regeneration effect, to improve the senile degenerative arthritis, rheumatoid arthritis, have certain effect, can improve joint problems.