Glucosamine Comp is a dietary supplement that helps relieve joint pain, especially that associated with mild to moderate osteoarthritis of the knee, and may also have benefits in treating other joints. Some people have used this supplement to try to treat conditions such as rheumatoid arthritis, inflammatory bowel disease, asthma, and allergies, in addition to chronic venous insufficiency, sports injuries, temporomandibular joint problems, and long-term back pain.