Chondroitin is a white powder with strong water absorption, easily soluble in water and becomes a viscous liquid. Most of it is mainly chondroitin sulfate in the clinic, which is an acidic mucopolysaccharide and is widely used in the clinic, mainly for certain neurological headache, neuralgia, arthralgia, migraine, arteriosclerosis, etc. It can also be used for the hearing impairment caused by streptomycin and the auxiliary treatment of hepatitis. It can adjust the body function and enhance the immunity of the body, and is a waterway for supplying nutrients, because chondroitin sulfate has good water retention. It is also able to maintain numerous trace elements including calcium, potassium, magnesium, sodium and many other ions involved in the manufacture of bones, and can effectively promote wound healing and maintain the lubricating effect of joints, and is often used in the treatment of osteoarthritis of the knee joint.