Like said, pre workouts are to be monitored if you are taking Beast. Beast can possibly raise your blood pressure. Personally, Hella raised my blood pressure more than beast does, I stay around 122/55 with a pulse around 58 on Beast. Hella had me around 140/80 lol, but there could have been other factors if stress can attribute to that.
Like johnboy said, you need something for your liver while taking this. Also, I found that taking fish oil WITH the Beast helped me get more out of it.