I have found Lipokinetix to be the best one I've tried. I've used hydroxycut, xenadrine, adipokinetix, ripped fuel, and separate E,C,A. It's pretty strong stuff, had me going 100mph all day long, I was taking it 3x a day, had a little trouble sleeping at first too. The only thing better, that I have tried, is T-3 (cytomel).