Tribulus terrestris

Marketing claim· human data

Also known as: Tribulus, Puncture vine

A perennial 'testosterone booster' that doesn't raise testosterone.

What it is

Tribulus terrestris is a plant extract and one of the most common ingredients in "testosterone booster" products. Its popularity rests on a long-standing reputation and a compelling marketing story rather than on results.

What the evidence shows

Testosterone, strength and muscle. Marketing claim· human data Controlled studies in men generally show it does not meaningfully raise testosterone or improve strength or muscle. The reputation has simply outlasted the disappointing evidence.

Who it suits

There is little reason to take it for its headline claim, which the evidence does not support.

Practical notes

As a herbal extract, quality and content vary between brands, and there are isolated reports of liver and kidney problems with some tribulus products. Given the lack of benefit, there is little reason to take on that risk. See our note on testosterone boosters for the wider category.

Sources

Frequently asked questions

Does tribulus raise testosterone?
No — controlled studies in men generally show it does not meaningfully raise testosterone or improve strength or muscle, despite being one of the most common ingredients in 'test booster' products.
Why is it in so many products then?
It has a long-standing reputation and a compelling marketing story, which has outlasted the disappointing evidence. Popularity here reflects tradition and marketing more than results.
Is it safe?
As a herbal extract, purity and dose vary between brands, and there are occasional reports of liver or kidney issues. Given the lack of benefit, there's little reason to take the risk.

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Written and reviewed by Mathew Beale — MSc Biotechnology, University of Reading.

Last reviewed: