What is msm msm methylsulfonylmethane is an organic sulphur compound found naturally within bones and joints why use msm msm is a necessary mineral for collagen production a protein found in an abundance within the body as a natural source of sulphur msm is a key building block of glycosaminoglycans a compound that forms the basis of joint cartilage this effective supplement has been developed to increase the bodys stores of msm for optimum results who can benefit msm suppleme