It's a sulfur product:
7 Benefits of MSM – The Miracle Supplement – The Shawn Stevenson Model
Counter point:
Meta-Analysis of the Related Nutritional Supplements Dimethyl Sulfoxide and Methylsulfonylmethane in the Treatment of Osteoarthritis of the Knee
They seem to negate their own validity a bit here in 4.1:
"There are some limitations of this meta-analysis. First, only three trials were available for inclusion assessing
N = 326 patients in total, of which
N = 161 received active treatment. Further trials may therefore affect the future assessment of these supplements. In addition specific methodological concerns have been identified in these trials including the issue of adequate treatment period with only one study assessing the supplements for a clinically relevant time [
43]."
It seemed to help me and I know others here have used it with success as well. I always have DMSO (another sulfur product) on hand. DMSO has actually been used in the horse racing industry for decades:
DMSO: The Best Injury Treatment You've Never Heard Of | dailymile community blog
Interesting stuff. Hope it helps.