it's actually a theoretical testosterone
enhancer mixed with caffeine containing herbs, such as guarana, and other energizers that act on the adrenals. Does guarana work? Yes, better than coffee, but whenever you get energy by taking a stimulant, you crash later, so it's only temporary energy, just like coffee, which is why people drink coffee all day long. It wears off quickly and you crash. But most of the herbs in this, such as damiana, tribulus, etc.