If you are looking for a stimulant that gives you enough kick to allow focus, concentration and muscle output, then try Neuro Awaken XT. I like it as it gives me mental focus, without feeling wired like being on coffee. Rather, I feel that I am more in control of my workout, muscle contraction, lowering the weights with full control, more energy and. It could be the Carnitines in there (GPLC, ALCAR and Carnitine-L-Tartrate) with the vinpocetine and . Another one I liked was FocusFactor, a friend recommended this. The only problem with that was the need for 8 pills to get an effect which is not cost effective.
If you want to go a cheaper route, then just get a concentrate B-Complex, take with Carnitine and .