I take liquid herbs from doctor lin.
www.actionlove.com
controversial site, some good information, some stupid. Ignore, it really.
But his products are alright, the liquids (tinctures) being the best. I like them because they increase you free testosterone and lower estrogen. It is all in how you mix the herbs, or what herbs you mix.
He even has a vacuum cup massage kit which you can use anywhere on your body, but for better erection quality, you can use it on the pc muscles, and it is really supposed to help blood flow and all that, seeing that those muscles are vital to erection quality. Interesting note: Doctor Lin states that sitting on your ass alot will age your sexual potential, and to bring it back to its highest, it may be necessary to use vacuum cup massage.
I take ginseng 4x and fibra. Decent prices. For a month supply (1 dropper, twice a day) of ginseng = $15. Fibra, which has yohimbe and is more for sex, is a 15 - 30 day supply for $17.