These are questions that I get asked all the fucking time. Most of the time I'm not in a position to whip out my enormous cock and let the proof speak for itself - that would be too easy. So let me say this - MULTIPLE studies have shown the ingredients in SizeVitrexx are extremely effective in vasodilation (increasing the flow of blood to your penis).
Men have reported successful gains of up to 4 inches taking SizeVitrexx. Myself and many other Male Porn Stars such as Ron Jeremy have reported using the product on set prior to pornographic filming to both increase the size of their penis and enhance their ability to perform.