Methylsulfonylmethane (MSM) is a sulfur-containing compound normally found in many of the foods we eat. MSM is a naturally-occurring source of organic sulfur that is easily absorbed, used by the body and found in all living organisms. This natural compound, researched since 1979, provides the chemical links needed to form and maintain numerous different types of tissues found in the human body, including connective tissue such as articular cartilage. While MSM is a natural component of almost all fresh fruits, vegetables, seafood and meat, food-processing methods reduce sulfur levels, making supplementation more important than ever. MSM supports organ and joint function by donating sulfur for maintenance of healthy connective tissue. MSM helps keep skin, hair and nails healthy by donating sulfur for production of keratin, a fibrous protein.