Admittedly, I'm not much of a supplement guy...I believe Tribulus and herbs like that (Tongkat, etc...) are good libido boosters, but will do next to nothing for elevating testosterone levels. Remember, this thread is about the "Best Natural Test Booster" and while some herbs will increase libido, they aren't the best natural test booster...I think you'll be more than impressed with MyoGenX, which I believe increases libido more than any other product on the market, but ALSO is the best natural test booster...the other herbs aren't in it's league.
Again, I'd reccomend checking out the supplement forum on steroid.com, where feedback has been 100% positive from everyone who has used it. We didn't give away any bottles, and didn't influence the people purchasing the product at all...and really the feedback has been pretty amazing.