CSA, or chondroitin sulfate, is a large molecule belonging to the glycosaminoglycans (GAGs) class. It is made up of glucuronic acid and galactosamine. Chondroitin sulfate sources such as bovine or shark cartilage. Chondroitin sulfate is often used for osteoarthritis. It is thought to help protect cartilage and the formation of the joint matrix structure. Chondroitin sulfate is also used in combination with other supplements to promote well-being.