MSM is 34% sulfur - the fourth most abundant mineral in the human body. Sulfur is necessary for the maintenance of healthy joints, tendons, ligaments and other connective tissue, and is associated with collagen, and the production of keratin. Opti-MSM is created by a reaction between dimethyl sulfoxide (DMSO) and hydrogen peroxide (H2O2). The process results in methylsulfonylmethane and goes through a purification process before being crystalized and tested at a third party laboratory. The resulting product is an extremely pure and simple molecule identical to MSM found in nature.