MSM is an excellent dietary source of sulfur, which all cells need. MSM is not only essential for the production of cartilage, which is composed of strong collagen fibers embedded in a gelatinous matrix of glucosamine and chondroitin (proteoglycans), but also for the production of keratin (hair, skin, hooves) as well as numerous enzymes and hormones that ensure proper digestion, central nervous system function, and immune function.