Tribulus: Uses, Benefits, Dosage & Safety

Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy

What is Tribulus?

Tribulus terrestris is a spiny plant used in traditional medicine and sold widely as a 'natural testosterone booster' for muscle, libido and athletic performance. Its supposed active compounds are steroidal saponins such as protodioscin. Despite its popularity in the gym and supplement world, it is one of the clearest cases where the marketing has run far ahead of what the trials actually show.

What Tribulus is commonly used for

In supplements, Tribulus is sold within men's vitality and sports formulas as a testosterone and libido booster. It is marketed confidently for muscle and male hormones — claims that controlled human trials have largely failed to back up.

How Tribulus works

In the laboratory, tribulus saponins have shown effects on nitric-oxide signalling that could in theory support erectile function, and animal studies have suggested libido effects. The leap to 'raises testosterone in humans,' however, is where the evidence breaks down: well-controlled human studies generally find no meaningful rise in testosterone, suggesting any libido effects work through other pathways.

What the evidence says

Here's an honest snapshot of what published research suggests about Tribulus — including where the evidence is limited.

• A randomised, double-blind, placebo-controlled trial found tribulus was no more effective than placebo for erectile dysfunction or for raising total testosterone. (PubMed)
• A larger, industry-funded randomised trial did report improved sexual function versus placebo in men with mild-to-moderate erectile dysfunction — illustrating the mixed and sponsor-influenced picture. (PubMed)
• General background is summarised by reputable health references; a systematic review concluded tribulus is not scientifically supported for raising testosterone in men. (MedlinePlus)

Typical dosage used in studies

Studies use a wide range, often 250–1,500 mg per day of extract, and products vary considerably in saponin content. This is general information from research, not a recommendation.

Side effects and safety

Tribulus is generally well tolerated short-term, with mild digestive upset the most common complaint. There have been rare case reports of liver or kidney problems with certain products, and very high doses are not well studied.

Medication interactions and who should avoid Tribulus

Sources & further reading

The evidence summary above is drawn from these sources. For general, authoritative background you can also consult:

• PubMed-indexed study (PMID 24630840)
• PubMed-indexed study (PMID 28364864)
• MedlinePlus
• NIH Office of Dietary Supplements
• NIH National Center for Complementary and Integrative Health

Frequently asked questions

Does tribulus boost testosterone?

Most well-controlled human studies find no meaningful increase in testosterone, and a systematic review concluded it is not supported for raising testosterone in men. The core marketing claim is largely unproven.

Does tribulus help libido or erections?

Results are mixed — one placebo-controlled trial found no benefit, while a larger industry-funded trial reported improved sexual function in mild erectile dysfunction.

Will tribulus build muscle?

There is little good evidence it improves strength or muscle in athletes, despite being marketed for exactly that purpose.

Is tribulus safe?

It is usually well tolerated short-term, but rare liver and kidney case reports exist. Caution is advised with diabetes and blood-pressure medicines and in pregnancy.

Why is it so popular if it doesn't raise testosterone?

Largely marketing momentum and tradition. The laboratory and animal hints simply have not translated into reliable testosterone effects in people.