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Tribulus vine from a distance.

Close up of a Tribulus flower on the vine.

I heard that a herbalist in Canada, Robert Rogers, recommends Tribulus saying that tribulus increases testosterone production by up to 30%. I could not confirm this.

I have found many articles online that refer to a bulgarian study of 200 men suffering from impotance. Supposedly, the results showed that tribulus extracts increased sperm production and sperm survival. I have not been able to confirm this either.

In my research, I found this snippet from about.com.

In the mid-1990s, tribulus terrestris became known in North America after Eastern European Olympic athletes said that taking tribulus helped their performance. The active compounds in tribulus are called steroidal saponins. Tribulus is most often used for infertility, erectile dysfunction, and low libido. In the last decade, it has become popular to improve sports performance. - about.com

I wasn’t totally convinced by the article on about.com so I searched for a more authoritative opinion on the possibility of Tribulus terrestris being a valid alternative to Viagra (Sildenafil citrate) for erectilte dysfunction (male impotance).

I finally found an opinion from a medical doctor:

Tribulus Terrestris and sexual behavior
One rodent study found tribulus to be helpful as a sex booster. Sexual behavior and intracavernous pressure (ICP) were studied in both normal and castrated rats to further understand the role of tribulus as an aphrodisiac. ICP refers to blood flow into the corpus cavernosa of the penis. Adult rats were divided into groups of 8 each that included distilled water treated (normal and castrated), testosterone treated (normal and castrated) and tribulus treated (castrated). Compared to the castrated control, treatment of castrated rats (with either testosterone or tribulus extract) showed increase in prostate weight and ICP. There was also a mild to moderate improvement in sexual behavior as evidenced by an increase in mounting frequency.
In my personal and professional experience, tribulus terrestris does seem to have a positive influence on sexual enhancement. I personally have noticed improved sexual performance after a few days of tribulus supplement use. Passion Rx with tribulus extract is even more potent. - Ray Sahelian, M.D.

Extracts of Tribulus can be found online and in many health food stores in capsules, tablets, and ground powder. It is also used in many power drinks.

that’s it.