ECY (ephedrine hcl, caffeine, yohimbine hcl), if you can handle the jitters during the first week or so. Or NYC (norephedrine, yohimbine, caffeine) for a less jittery stack. I make my own ECY stack with 25 mg ephedrine hcl, 200 mg caffeine and 15 mg yohimbine hcl. I take the ECY stack once in the morning before eating and EC 1-2x later in the day, but no later than 3:00 pm if I want to sleep.