MSM is the short name for a dietary supplement known as Methyl-Sulfonyl-Methane. MSM is the biologically available (organic) form of sulfur. Due to its chemical similarity to sulfur, MSM has shown to be effective at relieving inflammation. Sulfur is a molecule that is integrated into almost every vital tissue of the body. MSM is used for muscle pain. It has shown some clinical evidence that it can be helpful for arthritis related joint discomfort due to joint pain. MSM dietary supplements provide the essential sulfur necessary for a number of body compounds. MSM is found in raw fruits, vegetables, nuts, and seeds. It is also found in many food such as eggs, cheese, and milk.