Glucosamine and Chondroitin are substances naturally found in the body that have recently become principal ingredients of most joint-support supplements. Glucosamine is a derivative of chitin from shellfish and is an amino sugar used by the body to maximize and improve the overall health of joints. Chondroitin works with and enhances Glucosamine’s function, and when fortified with Manganese and Vitamin C, a supplement such as Now Glucosamine & Chondroitin – Sustained Release 90 tabs that contains all these nutrients in ideal amounts, can undoubtedly provide the essential nourishment to maintain healthy bones and joints.