I just visited my doctor for a hamstring pull that was severe. He knows I am an herbalist and won't take prescription drugs and he suggested a site called www.ihealth.com and order DMSO. He said it is used for the injuries in horses who need to be up and running and there are no side effects at all for humans. I got some and it is WONDERFUL!!! Be sure to get the rose-scented one as I was told the plain has a terrible smell. The rose-scented one is very pleasant, just like rose water.