MSM is an organic form of sulfur. Sulfur is is 3rd most abundant mineral in the body. Here is a great article by Dr. Mercola
articles.mercola.com/sites/articles/archive/2011/09/12/the-third-abundant-mineral-in-your-body-are-you-getting-enough.aspxI recently added MSM to my herbs. It's a great detoxifier too.