MSM for Joint Pain Relief Joint pain is one of the most common reasons people feel limited in their daily lives. Whether it’s stiffness, inflammation, or reduced mobility, chronic joint discomfort can slowly chip away at quality of life. One natural compound that has gained increasing attention for joint support is MSM . What Is MSM? MSM (methylsulfonylmethane) is a naturally occurring sulfur compound found in plants, animals, and the human body. Sulfur is an essential build