Sulfur is a very important mineral in the body. It participates in the synthesis of proteins: keratin, elastin, and collagen, and of mucopolysaccharides. Mucopolysaccharides, also known as glycosaminoglycans (molecules made up of proteins and carbohydrates), are found in connective tissue (the supporting tissue of the body). MSM "Opti MSM" is a una patented source of highly available sulfur.