Chondroitin sulfate is derived from acidic mucopolysaccharide extracted from pig's laryngeal bone, nasal bone, trachea and other cartilage tissues. Chondroitin sulfate is widely found in human and animal cartilage tissues. Its medicinal preparation mainly contains two isomers of chondroitin sulfate A and chondroitin sulfate C. The content of chondroitin sulfate in the cartilage of animals of different species and ages is different.