Glucosamine is a natural compound found in the body, particularly in cartilage, which is the tissue that cushions joints. It is often taken as a dietary supplement to help support joint health and reduce symptoms of arthritis. Many people believe that glucosamine can help improve joint function and decrease pain, making it popular among athletes and older adults. This supplement is commonly derived from shellfish or made synthetically. Some studies suggest that glucosamine may help slow the progression of joint damage, while others show mixed results. Always consult a healthcare professional before starting any new supplement, especially if you have allergies to shellfish or other health concerns.