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Tribulus

Tribulus

Best for

Feel more sexual desire

Large effect, needs confirmation 750–10500 mg/day 4–13 weeks 2 studies, n=120 #2 of 9 studied

Tribulus likely offers a modest benefit for sexual function in women, while testosterone claims remain unsupported by human evidence so far.

Median effective dose, most-studied outcomes

  • Enjoy more satisfying sex 5,625 mg 4–13 wk
  • Feel more sexual desire 5,625 mg 4–13 wk
  • Become more sexually aroused 750 mg 4–13 wk
Full protocol, 6 outcomes

Risk, worst reported severity

  • acute kidney injury severe
  • priapism severe
  • antidepressants major
  • haloperidol moderate
All 13 events and interactions

What tribulus actually does

Outcome Effect Evidence Dose Time Rank
Modest benefits 1
More reliable erections Likely modest benefit Erectile function shapes comfort, confidence, and intimacy during sex.
small 		1 meta-analysis 1 papers · n=272 750–1500 mg — #3 /8
Worth watching 2
Feel more sexual desire Large effect, needs confirmation Sexual desire and arousal can make intimacy feel more wanted and engaging.
large 		2 RCTs 2 papers · n=120 750–10500 mg 4–13 wk #2 /9
Greater sexual satisfaction Large effect, needs confirmation A satisfying sex life can include enjoyment, connection, and time for intimacy.
large 		3 RCTs 4 papers · n=120 0.75–10.5 g 4–13 wk #1 /7
Early research 2
Better sexual function for women Faint early signal Sexual function includes desire, comfort, arousal, and satisfaction, including around menopause.
small 		2 RCTs 2 papers · n=120 750–10500 mg 4–13 wk #1 /8
Raise testosterone levels in men Barely detectable Testosterone levels in men are tied to sex drive, erections, muscle mass, and energy.
trivial 		1 RCT 2 papers · n=30 0.77–6 g 6–9 wk —

Effect tiers come from native-unit MCID where available, Cohen's d otherwise.

Protocol

Dose, timing & forms

How much

For sexual desire and satisfaction, studies used oral tribulus products ranging from 750 mg to 10.5 g daily for several weeks. That enormous range is a warning against treating milligrams alone as a quality marker, since the extracts and study populations differed. 1 For erection firmness, the available evidence is thinner, with one positive study using 750 to 1,500 mg daily. Testosterone is not a reason to chase higher doses: trials using up to 6 g daily showed no meaningful testosterone increase in young men. 2

When and how long

Take it daily, not only before sex. The relevant trials tracked changes after weeks of consistent use, not an immediate effect from a single capsule. 1 The studies do not establish a best time of day or a clear advantage for taking it with food, so follow the product directions and prioritize consistency.

Forms & standardisation

Look for a product that clearly identifies Tribulus terrestris and states the plant part and extract standardization, usually total saponins or protodioscin. The wide dose range in trials reflects genuinely different preparations, so a label that only says “tribulus” gives you very little to compare. 1 A standardized extract still does not guarantee a testosterone effect, which human research has not shown. 2

Studied range, by outcome

Outcome Studied range Median effective Duration Evidence
Enjoy more satisfying sex 750–10,500 mg 5,625 mg 4–13 wk 4 papers 2 sig. endpoints
Feel more sexual desire 750–10,500 mg 5,625 mg 4–13 wk 2 papers 2 sig. endpoints
Become more sexually aroused 750–10,500 mg 750 mg 4–13 wk 2 papers 5 sig. endpoints
Improve sexual function 750–10,500 mg 5,625 mg 4–13 wk 2 papers 2 sig. endpoints
Support healthy testosterone in men 6 g — 6–9 wk 2 papers
Get and keep firmer erections 750–1,500 mg 1,125 mg — 1 paper 1 sig. endpoint

Adverse events and drug interactions

Safety events

acute kidney injury severe
priapism severe
adrenal insufficiency / HPA axis suppression severe
Cushingoid features (facial puffiness) moderate
weight gain moderate
new-onset diabetes mellitus (HbA1c 6.5%) moderate
abdominal cramp mild
subclinical hypothyroidism (TSH 7.19 µIU/mL, anti-TPO positive) mild

Drug interactions

antidepressants major increases toxicity
haloperidol moderate decreases effect
cisplatin moderate decreases concentration
metronidazole moderate decreases effect
other moderate increases concentration
Buy well

Recommended Tribulus products

Real products that dose Tribulus where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.

Chosen for adequate Tribulus dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.

In context

What this is and how it works

  • One study (n=272) reported improved sexual function in women; the effect size and noticeable-change threshold were not provided.1
  • Eight papers reviewed here span 28 outcomes, including sexual function, testosterone, and nitric-oxide signaling.
  • A controlled study found no androgen-production increase in young men taking Tribulus.2

Tribulus comes from Tribulus terrestris, a low-growing plant used in traditional medicine across parts of Europe, Asia, and Africa. Supplements usually contain fruit or aerial-part extracts packed with plant compounds called saponins, although products can differ dramatically in what and how much they contain.

Tribulus does not have a proven single mechanism in people. Researchers are investigating whether its saponins influence nitric oxide signaling, the chemical system that tells blood vessels when to widen. Think of nitric oxide as a faucet that opens extra room in a blood vessel, although human trials have not established that this explains tribulus's sexual effects. 3

Bottom line

Tribulus is most reasonable for someone curious about an early, not yet settled, option for sexual desire or satisfaction, especially when they understand that outcomes vary and better trials are needed. 1 Skip the testosterone marketing. It has not delivered a meaningful testosterone increase in human research. 2 Avoid self-experimenting if you take prescription medicines or have kidney concerns, given reported serious safety issues and interaction concerns. 4

Frequently asked

Common questions

Does tribulus increase testosterone?

It does not appear to reliably raise testosterone in men. The small human studies examined testosterone directly and found no meaningful androgen increase. 2

Does tribulus work for sexual desire?

Early clinical trials suggest tribulus can improve sexual desire and satisfaction for some women, but the evidence base remains small and needs larger confirmation studies. 1

How long does tribulus take to work?

The sexual-function trials used tribulus daily for roughly 4 to 13 weeks, so it is not an occasional, same-day supplement. 1

Sources

Sources

  1. 1. Tribulus terrestris for the treatment of sexual dysfunction in women: A randomized, double-blind, placebo-controlled study (2017) ↑
  2. 2. The aphrodisiac herb Tribulus terrestris does not influence the androgen production in young men (2005) ↑
  3. 3. PubMed records on Tribulus terrestris and nitric oxide signaling
  4. 4. PubMed records on Tribulus terrestris adverse effects and kidney injury

Generated August 27, 2026

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