NOW® Liquid Glucosamine & Chondroitin with MSM - Citrus combines three of the most effective nutrients available today for supporting good joint health in an easily absorbed liquid form. Glucosamine and Chondroitin are naturally occurring structural components that are used by the body to support healthy joint function. MSM, Manganese and Vitamin C complement Glucosamine and Chondroitin and work synergistically with them to provide optimal nutritional support. Contains shellfish (crab, shrimp, lobster, crayfish).