This stuff is crazy! I stacked it with Jacked and the pumps were almost to good. The pumps last so long they go into my cardio which makes it tough to run sometimes. I have had to lower the dose on leg day's due to the fact that the pump on my calves and quads were so tight that it started to hurt. Once you get your tolerence figured out, you will love NO Beta. The price is not that bad. if you just take 3 before workout "which is sometimes to much, but its the recommended dose." it will last yu 60 workouts.