Tribulus Terrestris: What’s Actually Proven, According to a 2025 Systematic Review
Tribulus Terrestris has been called “one of the most controversial plants” in supplement research, and a recent, thorough systematic review backs that up: it doesn’t deliver what most marketing implies, though there’s a real, narrower finding worth understanding underneath the noise.
What It Is
Tribulus Terrestris is a creeping herb used in traditional Ayurvedic medicine (where it’s called Gokshura) for urogenital complaints, including low libido. Its marketed active compound is protodioscin, a steroidal saponin believed to stimulate luteinizing hormone release, which in turn signals the testes to produce testosterone — the proposed mechanism behind most testosterone-related Tribulus marketing.
The 2025 Systematic Review
This is about as clear and current a verdict as we’ve found for any ingredient we cover — a comprehensive, recent, dedicated review that doesn’t leave much ambiguity about the testosterone claim specifically.
A Real Nuance Underneath
Read together with the 2025 systematic review, this suggests a genuinely interesting possibility: if Tribulus has a real effect for some men, it may not be working through the testosterone-raising mechanism the marketing describes. A symptom improvement without a measurable hormone change is a real, different finding than “it boosts testosterone” — and it’s the kind of distinction that gets lost when a single ingredient gets marketed for many different claims at once.
Why Sourcing Matters
Not All Tribulus Is the Same
Nearly all of the more favorable clinical data traces back to a specific Bulgarian-sourced leaf extract, independently shown to have the highest protodioscin content among tested sources. A product simply listing “Tribulus Terrestris” without specifying protodioscin content or sourcing may contain a meaningfully different, and potentially far less active, version of the plant than what’s actually been studied.
Studies have also used a wide range of doses and standardizations — from 112mg of protodioscin per day to whole-extract doses of 750mg/day with no significant effect — making direct comparisons between commercial products and the underlying research genuinely difficult without knowing a product’s specific standardization.
Where This Shows Up
We reviewed Volume Pills, which includes a Tribulus-derived ingredient (branded as Drilizen) described as standardized for protodioscin content. We were not able to independently confirm its specific protodioscin percentage or sourcing origin against the research above — worth checking the current label directly if Tribulus’s evidence specifically is a deciding factor for you.
FAQ
Does Tribulus Terrestris raise testosterone?
A 2025 systematic review found no robust evidence that it does. This is a fairly clear, current, comprehensive verdict on that specific claim.
Does it help with erectile function or libido at all?
One well-designed trial found a real symptom improvement in men with mild-to-moderate ED and low libido, without a corresponding hormone change — suggesting any real effect may work through a different mechanism than testosterone.
Why do different studies show such different results?
Studies have used very different doses, extract standardizations, and plant sourcing. Most of the more favorable results trace to a specific Bulgarian-sourced, protodioscin-standardized extract, not “Tribulus” generically.
Do I need a prescription?
No. Tribulus Terrestris is available as an over-the-counter dietary supplement.
See how this fits into our full product score
Read Our Volume Pills ReviewLast reviewed: September 2026 · Read our full rating methodology · Clinical reference: Vilar Neto et al., 2025, Nutrients.