I am going to be doing the Asteroid Stack here in the next two weeks and am going to add Jack3d to it as well. I want to make sure that the same things that happened to me using NO Shotgun will not happen to me with Jack3d. When taking NO Shotgun I would get dizzy, short of breath, and feel like I was going to pass out. I was not taking ANYTHING else with it, or even around that time, including any other caffein. I know that things effect people differently, I just don't want to buy Jack3d and it end up messing me up like NO Shotgun did. USP Labs make some awesome stuff and I can't wait to do the Asteroid Stack and I would love to add Jack3d to it as well!!! Hopefully all will work out.