Jarrow Formulas MSMSulfur is an organic source of bioavailable sulfur, an antioxidant mineral found in major structural molecules of the body such as cartilage. The sulfur from MSM is used to produce glycosaminoglycans (or mucopolysaccharides) such as chondroitin sulfate, dermatan sulfate and hyaluronic acid. These sulfur containing glycosaminoglycans are found in high concentrations in connective tissue, including joint cartilage, skin and collagen.