It is a mixture of things that can be purchased cheaper separately. Tribulus stimulates testosterone production to increase libido, the other ingredients increase blood flow to the penis for stronger erections. I would not take this because of the yohimbe, which raises blood pressure and gives me an unpleasant speedy feeling. What works best for me is L-Arginine, two grams taken two hours before sex. L-Arginine can cause herpes outbreaks when taken in large doses, so you should take Lysine along with it for safety. It can also cause diarrhea if you are not used to it, so try small doses at first.

The problem with all of this herbal and holistic stuff is that there is no regulation or requirements to prove that they do what they claim to do.  They essentially leave it to the public to test.  Then when you get a lot of testimonial advertizing the public often can't separate expectations from reality (do I feel better?  I must, I took the stuff..sure I feel better)

When people take things that alter hormone activity they potentially invite tumorogenesis.  And without controled studies to give some kind of idea as to the eficacy, where are you?

Ask yourself, does anything increase blood flow to only one organ?  Maybe, but maybe not.  Ginko has been touted as a memory booster.  When studied, it did show increased blood flow to the brain so perhaps it did improve memory...but it also caused a statistically significant number of brain hemorrhages!

Tell you what, you guys test it and let me know in a few years how you are doing.