What Is MSM Powder? MSM powder (methylsulfonylmethane) is a sulfur-rich, naturally occurring chemical that is found in most plants and animals. MSM powder is found in many parts of the body and is used during the metabolic process, which is why MSM supplements are popular. MSM Powder Benefits † MSM powder contains an essential chemical that helps support the joints, immune function, skin, and hair. In addition, an MSM supplement also contributes to healthy digestion and aids in recovery after strenuous exercise..† Support the joints Fortify immune function Promote healthy skin and hair Aid digestion Assist in recovery after exercise