Studies have shown that glucosamine, chondroitin and MSM provide dietary components that support healthy joint structure and function. NOW Glucosamine, Chondroitin & MSM combines these effective nutrients for supporting joint health in one dietary supplement. Our Glucosamine and Chondroitin are both 100% sulfate, the most studied form of these nutrients. In addition, we also include MSM (Methylsulphonylmethane), an organic form of sulfur found in all living organisms. Contains shellfish (crab, shrimp, lobster, crayfish).