What is MSM(Methyl Sulfonyl Methane)? Methyl Sulfonyl Methane (MSM) is an organic compound that contains sulfur. Its chemical formula is (CH3)2SO2. It is also known by other names such as dimethyl sulfone and DMSO2. MSM is a naturally occurring substance found in small amounts in various foods and beverages, including fruits, vegetables, milk, and tea. It can also be produced synthetically. In i..