NOW Foods Glucosamine and Chondroitin Extra Strength - 120 TabletsNOW Foods Glucosamine & Chondroitin Extra Strength are naturally occurring structural components that have recently enjoyed growing popularity. NOW Foods Glucosamine is an amino sugar derived from the chitin of shellfish and is used by the body to support healthy joint structures. NOW Foods Chondroitin complements Glucosamine and works synergistically to provide optimal nutritional support.