Hi Glucosamine and chondroitin are structural components of cartilage, the tissue that cushions the joints. Both are produced naturally in the body. They are also available as dietary supplements. Researchers have studied the effects of these supplements, individually or in combination, on osteoarthritis, a common type of arthritis that destroys cartilage in the joints. Glucosamine is a naturally occurring compound that is chemically classified as an amino sugar.It serves as a building block for a variety of functional molecules in your body but is primarily recognized for developing and maintaining cartilage within your joints.So glucosamine and chondroitin can be used since both the compounds have cartilage protective activity. Hope that was helpful.Let me know if i can assist you further. Regards Dr.Saranya Ramadoss General and Family Health Physician