I used to get these ABB Speed Stacker drinks when I went to the gym. (2carbs=D, Ephedra and Caffene) The serving size was 1 bottle, but I'd only drink like 2/3 or 1/2 at a time, 3 or 4 days a week. I lost a few pounds and I definitley had more energy.. I got high off it, felt like I was taking speed. lol.