I don't like commercial penis pills because they are usually worthless,expensive,and filled with artificial chemicals. I know of some good natural herbal supplements that are good to boost blood flow and sex drive and can make you harder and maybe a bit bigger. I would recommend L-Arginine and Horny Goat Weed as two good supplements that are relatively cheap and work on sex drive and blood flow to the penis.
L-Arginine
Horny Goat Weed