Pure MSM contains only the purest form of Methylsulfonylmethane (MSM), indicated for the use of connective tissue support in horses. When added to your horse’s daily diet, it can improve connective tissue function. MSM is a natural antioxidant, which also helps prevent free-radical damage. Contains ultra pure, 100% MSM to aid in the production of collagen, which promotes joint, cartilage and skin health.