MSM is an abbreviation for methylsulfonylmethane, which is a naturally occurring organic sulfur compound. It is often used as a dietary supplement, primarily for its potential benefits for joint and muscle health. MSM is thought to relieve pain and inflammation associated with conditions such as osteoarthritis and sports injuries. It is also considered to have antioxidant properties and may promote the health of skin, hair, and nails. MSM can be found in powder or capsule form and can be a popular choice among those looking for natural alternatives to promote their overall well-being.