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Tribulus raised erectile function scores by about 3 points on a 25-point scale in a meta-analysis — but the same review found it did not budge testosterone levels at all.
This is a small, low-strength body of evidence (3 studies, 2 positive, 1 neutral) from a clinical population of men with erectile dysfunction, so the modest improvement may not apply to healthy men or general supplement users.
A meta-analysis of three randomized trials found that Tribulus terrestris supplementation improved erectile function scores by an average of 3.23 points on the IIEF-5 questionnaire (a measure of erectile hardness and ability to maintain erections). However, the supplement had no effect on total testosterone levels, and side effects were no more common than with placebo. Because the studies were small and the overall evidence strength is low, the finding is intriguing but far from settled.
Where this fits in the evidence
Pillser has synthesized 3 studies on Tribulus for Improved Erectile Function — overall evidence strength: Low.
Across 3 studies of patients with erectile dysfunction, 2 reported moderate beneficial effects on erectile function, while 1 high-quality meta-analysis found a small neutral effect. The overall evidence direction is beneficial with a moderate effect size among positive studies, but findings are mixed and the most robust study does not support efficacy.
The study
- Meta-Analysis
- 2025-05-13
- International journal of impotence research
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.