Methyl-Sucfonyl-Methane (MSM) is an organic sulfide with the molecular formula of CH₃SO₂CH₃, which is necessary for human collagen synthesis. Methyl-Sucfonyl-Methane is contained in human skin, hair, nails, bones, muscles and various organs. The human body consumes 0.5mg MSM every day. Once lacking, it will cause health disorders or diseases. Therefore, as a dietary supplement, it is widely used abroad.It also maintains the balance of biological sulfur in human body.