GroMax Nootropic is a vacuum pump can make a pen'is look larger temporarily. But using one too often or too long can damage elastic tissue in the pen'is, leading to less firm erections.. Ads for pen'is-enlargement products and procedures are everywhere. GroMax Nootropic, pills, weights, exercises and surgeries claim to increase the length and width of your pen'is. However, there's little scientific support for nonsurgical methods to enlarge the pen'is. And no reputable medical organization endorses pen'is surgery for purely cosmetic reasons. Most of the techniques you see advertised are ineffective, and some can damage your pen'is. Think twice before trying any of them. Similarly, studies suggest that many men have an exaggerated idea of what constitutes "normal" pen'is size.