Vigrx Plus works by allowing the penis to hold the maximum amount of blood, as well as improving blood flow. The more blood the penis can hold, the bigger the erection. This means not only harder, but thicker and longer as well. With continued use, this has the potential to add inches to your current erection size. No matter what size your penis is, whether itâs smaller than average, average, or youâre already well-endowed, Vigrx Plus offers you the opportunity for more- More inches, more strength, and more confidence.