Im taking a similar product made by Sci-Fit that is called Thermo-Gen II. It has 10mgs of Yohimbine HCL, 25mgs Ephedrine, 33 mgs of Caffeine, and other assorted goodies per capsule. I take two of these in the morning with a cup of coffee(for added Caffeine), and Im flying for hours. This is from a guy who used to take 50mgs of Ephedrine, and aspirin, and a cup of coffee in the morning on an empty stomach & feel nada. It definitely works, and goes great added with growth for additional weight-loss properties.