I buy it in 5kg pails, 99.8% pure MSM
powder, but I buy the one for ...
horses, which is probably the same as for humans but much cheaper.
Well worth a try, but if you decide, get a smaller quantity at first, to test it.
You can gradually increase the dose for 2-3 weeks till you reach the desired higher dose. You can take it with water or juice-it's a bit harsh at first but you develop a taste tolerance after a while.