MSM

Methylsulfonylmethane, or MSM, is a naturally-occurring sulfur compound that is found in humans, animals, and plants. It can als... Methylsulfonylmethane, or MSM, is a naturally-occurring sulfur compound that is found in humans, animals, and plants. It can also be produced synthetically in the form of a dietary supplement. In our bodies, MSM is concentrated in our nails and hair.