While so-called penis enhancement pills won't increase penis size permanently, they will help increase the blood flow to the penis during an erection. Why is this important? Because erect penisnsize is largely determined by the amount of blood your penis is able to hold. It's like a balloon holding air; the more it's able to take on board, the bigger it is.

The second way in which enhancement pills work is by encouraging the release of testosterone to increase libido.