Tribulus

botanicalharman

What is it

Tribulus is the genus name for a group of flowering plants in the caltrop family, with Tribulus terrestris being the most widely used species in supplements. The name 'tribulus' on supplement labels typically refers to T. terrestris (puncture vine) used for sexual function and athletic performance.

How it works

Tribulus species contain steroidal saponins (primarily protodioscin), flavonoids, alkaloids, and other compounds. Protodioscin has been hypothesized to stimulate luteinizing hormone release and downstream testosterone production, though most controlled clinical trials in healthy men have not confirmed significant testosterone elevation. Laboratory and animal studies suggest possible effects on nitric oxide production, vascular endothelial function, and androgen-related signaling, which could underlie traditional claims about sexual function and vitality. Other proposed effects include mild diuretic activity and influence on blood glucose regulation, though clinical translation is limited. The broader 'tribulus' genus includes species used in different regional traditions, but most modern research and supplement products focus on T. terrestris. Effects vary by extract type, plant origin (Bulgarian, Indian, Chinese varieties differ), and standardization. Most clinical research has produced modest or negative findings in healthy populations.

Evidence for 4 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Male sexual function and libido

Grade C

Moderate evidence

Some trials in men with sexual dysfunction suggest modest subjective improvement in libido and erectile function with tribulus over weeks. Effects in healthy men are less consistent.

Female sexual function

Grade C

Moderate evidence

Some trials in postmenopausal women report modest improvement in libido and arousal. Evidence is limited and preliminary.

Testosterone elevation in healthy individuals

Grade D

Mixed evidence

Most controlled trials in healthy men show no significant increase in serum testosterone with tribulus supplementation.

Athletic performance

Grade D

Mixed evidence

Controlled trials in trained athletes do not consistently show improvements in strength, muscle mass, or performance.

3 commercial forms

Standardized extract

Typically standardized to 20-95% saponins

Most common modern form.

Bulgarian tribulus

Traditional Bulgarian sourcing, often higher protodioscin

Marketed as more potent variant.

Whole plant powder

Less concentrated, variable composition

Traditional whole-herb preparation.

Dosage

There is no established RDA. Common supplement doses are 250 to 1,500 mg of extract per day, often standardized to 20 to 95 percent saponins. Clinical trials have typically used 250 to 750 mg of standardized extract two or three times daily. Effects, when present, generally require weeks of consistent use rather than acute dosing.

When and how to take it

Tribulus can be taken with or without food, though taking with meals may reduce mild GI effects. Doses are typically divided two or three times daily. Allow 4 to 12 weeks of consistent use before judging effects. Avoid late evening if you notice any sleep effects.

Safety

Tribulus is generally well tolerated. Reported side effects include mild gastrointestinal upset, nausea, and occasionally sleep disturbance. Higher doses may worsen GI symptoms. Rare reports of liver injury and gynecomastia exist, though causality is uncertain. There is no established Tolerable Upper Intake Level.

Who should be cautious

Avoid in pregnancy and breastfeeding due to insufficient safety data. Avoid in hormone-sensitive conditions (breast, prostate, ovarian cancer; endometriosis; uterine fibroids). People with diabetes, cardiovascular disease, or on prescription medications should consult a clinician. Discontinue two weeks before surgery. Not recommended for adolescents or children.

Interactions

Tribulus may potentiate effects of diabetes medications and antihypertensives. May affect lithium clearance. Some animal data suggest possible effects on warfarin metabolism. Combined use with hormone-modulating therapies has not been well studied. Discuss with a clinician if you take prescription medications.

Frequently asked questions

Is tribulus the same as tribulus terrestris?⌄

On supplement labels, 'tribulus' typically refers to Tribulus terrestris (puncture vine). The genus contains other species, but T. terrestris is the most widely used.

Does tribulus increase testosterone?⌄

Most controlled trials in healthy men have not shown significant testosterone increases with tribulus, despite marketing claims.

Can tribulus improve athletic performance?⌄

Controlled trials in athletes generally do not show consistent benefits on strength or muscle mass.

How long until I notice effects?⌄

Effects, when present, typically emerge over 4 to 12 weeks of consistent use, not acutely.

Is tribulus safe to take?⌄

Generally well tolerated at typical doses. Avoid in pregnancy, breastfeeding, hormone-sensitive conditions, and discuss with a clinician if you take prescription medications.

References

  • ChEBI: harman — ChEBI Database link
  • Wikidata: Tribulus — Wikidata link

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Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.