I have MSM and put it in my greens drink (recipe from Grzbear...and added some other things) when I make it up. I have also used just under 1/3 cup in my baths, which have several other things, as well :D. I feel great after these baths.
I have not used it in my oil pulling and only because it would, to me, be (not necessairly in taste) salty...more precisely, gritty with the oil.
Try it and let us know how it works for you, Cityman!