due to an old football injury I have trouble on the treadmill. even at a modest intensity I have pain in my left knee. I also have to be careful when I do things like cable pushdown for tricep. I have to make sure I dont lock my knees when I press down or I end up with joint pain. squats dont bother me because I dont go up to full lock. I dont know what the injury is because I never went to the doctor, but Im curious if there is a suppliment that helps with joint pain/imflamation? thanks