it is methyl-sulfonyl-methane....supposed to be good for reducing inflammation, I have had hip and back and neck pain for years and it helped quite a bit..now I realize it was helping me to detox from the mercury too. It may have helped save my life in the long run.

It is a sulfur compound, and I take 1000 mg am and pm. Careful though, especially if you are sensitive to sulfur.

hope it helps,
Sandi
xoxo