Tribulus comes from a plant found in many warm regions of the world and is also known as Puncture Vine. It is actually considered a weed. But as with many plants, it has been used to help sexual performance and increase testosterone for 100s of years. One region of the world, Bulgaria, is known for having the most potent and effective Tribulus.

Tribulus works in a different way than your normal testosterone booster. Many of the pro-hormones that were legal a few years back converted to testosterone in your body and thus also had the side effects associated with it. Tribulus does not convert to anything and actually works by stimulating the release of leutinizing hormone (LH) and LH serves to stimulate the natural production of testosterone. It seems to be more effective in older users of the supplement since it only brings your testosterone up to where it should be and will not make you produce more than your body needs. This means no side effects. The active contents are steroidal saponins, alkaloids, and flavanoids, and its protodioscins content is believed to be responsible for its effects.

I've used Tribulus now for numerous years on a daily basis with no side effects and from personal experience it has helped with increasing my libido and lean muscle mass in my bodybuilding hobby. I'm over 40 so it seems to work well for me.

I have tried various types and personally like Ultimate Nutrition Bulgarian Tribulus.