I have heard it helps with metabolism, but it is mostly for joints, skin/hair/nails and flexibility for the body. I take 1 Tbs MSM and 1/8 tsp of vitamin C powder per day in a reusable Voss glass water bottle that I use. It is about 27oz. Since I have been taking it, I have noticed my skin is much smoother, less wrinkled(?) and I have a scar that seems to be getting less noticable.
That is my experience! Good luck and thanks for asking :-)