MSM (methylsulfonylmethane) is a naturally occurring form of organic sulfur found in every living organism. This natural compound, studied since 1979, provides the chemical links needed to form and maintain many different types of tissues in the human body, including connective tissues like joint cartilage. Although MSM is a natural component of almost all fresh fruits, vegetables, seafood, and meats, food processing methods reduce sulfur levels, making supplementation more important than ever.