This thread is a spin off from the "listen to your body" thread. After advice from people, I started noticing a pattern. Jack3d is ****ing people up. My experience with it has been normal. I go to the gym after a longs day work, and it wakes me back up. I don't feel like superman or bounce off the walls. It simply gives me the jump I need to get a good workout in after work. I did admit that i've been dizzy while hitting the bag, but I blame that on a poor diet. Those of you who use Jack3d, what is your experience with it? How often do you take it and how much. If infact it turns out that perhaps we shouldn't use it, what is a good alternative?