One, Thermorexin addresses several aspects of dieting and even includes smart drugs to help you keep focus. It has appetite suppression to help keep you from cheating. It has thermogenics and stimulants to keep your metabolism raised and you workouts easier. The other, Liporexin is for those people who don't want to use stimulants or that want some thyroid adjustment rather than stims. Liporexin is a fat burner that you can take before bed at night. When you take them together you have created the perfect diet and fat burning environment.