Okay, I have read that it could be dangerous to take norephedrine or ephedra with yohimbine in a fat-burning/thermogenic supplement. Can anyone reveal the facts on this? I was taking MD6 -- the old formula that had norephedrine and yohimbine HCL -- and now want to take the new formula that ephedra (I'd heard the FDA made the makers of MD6 take the noreph out of their formulation) and yohimbine. Is it true that I should avoid intense MHR cardio while taking ephedra and yohimbine together?