MSM (methyl sulfonyl methane) supplies biologically active sulfur in a safe, nontoxic way.Methyl-sulfonyl-methane (MSM) is a naturally occurring sulfur compound derived from pine trees. MSM and its related compounds are the source of 85% of the sulfur found in every cell of all living organisms. It is the fourth most plentiful mineral found in a healthy body and it also occurs naturally in fresh, organic, fruits and vegetables. However, most of the MSM in our food is lost in washing, cooking, steaming, packaging and preparation. In short, modern agriculture and food processing have robbed our food of the natural sulfur we need. Naturally occurring sulfur, such as that found in supplements using Lignisul MSM, is not to be confused with inorganic sulfides, sulfites and sulfates, to which, many people are allergic.