Tribulus
Tribulus terrestris
A plant marketed for testosterone, libido, and athletic performance. Evidence suggests it may improve sexual desire — especially in women — but it does NOT reliably raise testosterone despite popular claims.
What is Tribulus?
Tribulus (Tribulus terrestris) is a flowering plant used in Ayurvedic and Chinese medicine for urinary, kidney, and reproductive complaints. It is heavily marketed in sports and 'testosterone booster' supplements, but the gap between its marketing and the actual evidence is one of the larger ones in the supplement world.
Known Health Benefits
How It Works
Tribulus's steroidal saponins, particularly protodioscin, are proposed to influence nitric oxide release (supporting blood flow and erectile function) and androgen-receptor expression in some tissues, which may explain effects on libido. Importantly, despite 'testosterone booster' marketing, controlled studies generally show it does not raise testosterone in healthy men; its libido effects appear to be largely independent of testosterone levels. It also has antioxidant and mild diuretic properties.
What Research Says
Evidence is mixed and modest. Several randomized trials — especially in women with low sexual desire and in some men with erectile difficulties — report improvements in libido and sexual satisfaction with standardized extracts. However, multiple controlled studies in athletes and men found no meaningful increase in testosterone or muscle/strength gains, contradicting the most common marketing claim. It sits in the preliminary evidence tier, with sexual-desire effects best supported.
Active Compounds
Steroidal saponins (protodioscin), flavonoids, alkaloids
Forms & Bioavailability
Saponin content varies enormously between products and plant parts (fruit vs. root vs. leaf), which is a major reason trial results conflict. Standardized extracts specifying saponin/protodioscin percentage are more reliable. Quality and contamination are real concerns, so third-party testing matters.
Dosage Guidance
| Use Case | Dosage |
|---|---|
| Libido / sexual function | 250–750 mg standardized extract daily |
| General / traditional | Per product label |
Always consult a healthcare provider for personalized dosing.
Potential Side Effects
Generally well tolerated; may cause stomach upset. High doses have rarely been linked to kidney or liver issues, and there are case reports of harm from contaminated products.
Who Should Avoid It
- Hormone-sensitive conditions (theoretical)
- Pregnancy and breastfeeding
- Kidney or liver disease
- Diabetes (monitor blood sugar)
Pregnancy & Lactation
Not recommended during pregnancy (may affect hormones and the uterus) or breastfeeding due to insufficient safety data.
Known Drug Interactions
May add to blood-sugar-lowering and blood-pressure medications; theoretical interaction with lithium (diuretic effect) and hormone-affecting drugs.
Evidence Classification
Based on in vitro studies, animal models, pilot trials, or traditional use documentation. Clinical evidence is limited.
Frequently Asked Questions
Does tribulus actually boost testosterone?
Largely no. Despite being marketed as a testosterone booster, controlled studies in healthy men generally find tribulus does not meaningfully raise testosterone or improve muscle and strength. Its more credible benefit is on libido, which appears to work independently of testosterone.
Does tribulus help libido?
It may. Some randomized trials — particularly in women with low sexual desire and in certain men with mild erectile issues — show improvements in libido and sexual satisfaction with standardized extracts. Results are mixed and depend heavily on product quality.
Is tribulus safe?
Standardized products are generally well tolerated short-term, but there are rare reports of kidney and liver problems (sometimes tied to contaminated or adulterated supplements), and it's not advised in pregnancy or with hormone-sensitive conditions. Choose third-party-tested products and consult a clinician if you take medications.
References
- Tribulus terrestris for treatment of sexual dysfunction in women: a randomized double-blind placebo-controlled trial. Akhtari E, Raisi F, Keshavarz M, et al.. Daru (2014)View study
- The effect of five weeks of Tribulus terrestris supplementation on muscle strength and body composition. Antonio J, Uelmen J, Rodriguez R, Earnest C. Int J Sport Nutr Exerc Metab (2000)View study
Related Health Conditions
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This entry is for educational purposes only. It is not medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement regimen, especially if you take medications or have health conditions.