First things first, you don't have to worry about energy or crashing at the gym with this pre-workout. As somebody with moderate caffeine tolerance (can down 2 cups of coffee without feeling adverse effects), I can truly say that this product is a bit strong for my taste. The first time I took it I felt nauseous all night. I tried half a scoop the next day and got some of the energy, but not enough. It will take more trial and error, but I can definitely say if a strong pump and energy boost are needed, this stuff will work.