Everytime you exercise you subject your joints to a great amount of stress. Your body is amazing, but those extra activities can take their toll on your joints. If you don't want to give up your activities you may want some help for your joints. Glucosamine is utilized by the body to support healthy joint structures. It is an amino sugar derived from the chitrin of shellfish. Other joint supplements include MSM (Methylsulphonylmethane), Hyaluronic Acid, and other forms of Glucosamine.