Extra Strength. Joint Health. Supports Normal Joint Function. High Potency. Quality GMP Assured. Glucosamine & Chondroitin are naturally occurring structural components that have recently enjoyed growing popularity. Glucosamine is an amino sugar derived from the chitin of shellfish and is used by the body to support healthy joint structures. Chondroitin complements Glucosamine and works synergistically to provide optimal nutritional support.