Methylsulfonylmethane (MSM) is an organosulfur compound with the formula (CH₃)₂SO₂. It is also known by several other names including methyl sulfone and dimethyl sulfone (DMSO₂).This colorless solid features the sulfonyl functional groupand is considered relatively inert chemically. It occurs naturally in some primitive plants, is present in small amounts in many foods and beverages, and is marketed as a dietary supplement. It is sometimes used as a cutting agent for illicitly manufactured methamphetamine.^[3] It is also commonly found in the atmosphere above marine areas, where it is used as a carbon source by the airborne bacteria Afipia.