I have the same problem as wild12. Other than the first few days I took N.O. Xplode I've never ever felt any stim effect from an energy drink or any NO/pre workout supplement.
I've got a bottle of Reset AD that I'm going to start next week. I hope that helps increase my sensitivity to stims like it's supposed to but I have a feeling it won't do anything
I use quite a bit of beta alanine and have never had any of the tingling that most people report. Being unresponsive to all this stuff is seriously frustrating, sometimes I wonder if I'd feel anything if I smoked crack.
Right now I'm logging Lean Fuel Extreme at four caps ED which is equivalent to the caffeine in eight cups of coffee. I feel no stim effect from it and that's after an h-drol cycle where I drank no caffeine at all for six weeks.
I used to drink A LOT of coffee but cut back long ago. I think the Reset AD is my only hope. Anyone got any other ideas?