Methylsulfonylmethane (MSM) is an organosulfur compound with the formula (CH3)2SO2. It is also known by several other names including DMSO2, methyl sulfone, and dimethyl sulfone.[1] This colorless solid features the sulfonyl functional group and 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.

Function:
1.Helps to maintain the structure of the proteins in the body 
2.Helps in the formation of keratin which is essential for hair and nail growth
3.Aids in the production of immunoglobulin which maintains the immune system
4.Catalyzes the chemical reactions, which change food into energy.
5.Inhibit pain impulses along nerve fibers (analgesia)
6.Lessen inflammation
7.Increase blood supply
8.Relieving pain and inflammation in muscles and joints
9.Improvement of joint flexibility
10.Reducing stiffness and swelling, improving of circulation
11.Reducing pain in systemic inflammatory disorders such as arthritis
12.Reducing scar tissue, and breaking up calcium deposits