MSM, or methylsulfonylmethane, is an odorless and tasteless natural sulfur compound found in all living things. Your body needs sulfur for healthy connective tissue and joint function. It supposedly can relieve pain and inflammation, too.

Although some studies have reported improvement in pain with MSM supplements, more research needs to be done to support its use as an arthritis supplement. The long-term benefits and safety of the chemical are unknown.

Talk to your doctor before taking MSM.