Evidence-based·Last reviewed May 30, 2026·How we grade evidence

Tribulus Terrestris

BotanicalHarman

Useful mainly for people trialing it for libido/sexual function (modest, variable evidence); not for testosterone or muscle.

Quick decision guide

May help most

people trialing it for libido/sexual function (modest, variable evidence); not for testosterone or muscle

Common dosing range

250–1,500 mg/day extract, often standardized to saponins, split 2–3 times daily

When to expect effects

Weeks (4–12)

Watch out for

Avoid with hormone-sensitive conditions and in pregnancy; product saponin content varies widely

What is it

Tribulus terrestris is a flowering plant from the caltrop family found in dry climates worldwide. Also called puncture vine, its fruit and aerial parts have been used in Ayurvedic and traditional Chinese medicine for cardiovascular and reproductive health, and it is widely marketed today for male sexual function and athletic performance.

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

You want to trial it specifically for libido or sexual function
You'll use a product standardized to protodioscin/saponins
You can commit to several weeks before judging

Probably skip if…

You expect raised testosterone or bigger muscles — trials don't support this
You have a hormone-sensitive condition or are pregnant/breastfeeding
You take diabetes, blood-pressure, or lithium medications without clinician input

Evidence at a glance

male sexual function and libido

Limited Evidence
Effect
Modest, variable
Best fit
men with reduced libido or mild sexual dysfunction
Time
Weeks

female sexual function (postmenopausal)

Limited Evidence
Effect
Modest
Best fit
postmenopausal women with low desire or arousal
Time
Weeks

testosterone elevation in healthy men

Mixed Evidence
Effect
No reliable effect
Best fit
none demonstrated
Time
Not applicable

Evidence for 3 uses

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

male sexual function and libido

Supplement benefit
Limited Evidence

Tribulus contains steroidal saponins (notably protodioscin) proposed to affect nitric oxide and vascular/endothelial function, the basis for traditional sexual-function use. Some trials in men with sexual dysfunction report modest improvements in libido or function, but evidence quality varies and product standardization is inconsistent. Benefits appear to occur, if at all, in men with existing dysfunction rather than healthy men.

Effect size
Modest, variable
Time to effect
Weeks
Best fit
men with reduced libido or mild sexual dysfunction
Less likely
men with normal sexual function seeking enhancement

Bottom line: May modestly improve libido or sexual function in men with dysfunction, on variable evidence.

Evidence is mixed

Some sexual-function trials are positive while others show no effect, and wide variation in product saponin content makes results hard to compare.

SourceKamenov et al., 2017 — PubMed· conflictingSansalone et al., 2014 — PMC· conflicting
SourceKamenov et al., 2017 — PubMedSansalone et al., 2014 — PMC

female sexual function (postmenopausal)

Supplement benefit
Limited Evidence

A few trials in women, particularly postmenopausal women with sexual dysfunction, suggest modest improvements in desire and arousal scores. Studies are small and limited, so the effect is preliminary. Product standardization issues apply here as well.

Effect size
Modest
Time to effect
Weeks
Best fit
postmenopausal women with low desire or arousal

Bottom line: May modestly improve desire and arousal in postmenopausal women, on small trials.

SourceMartimbianco et al., 2020 — PMCPostigo et al., 2016 — PMC

testosterone elevation in healthy men

Biomarker support
Mixed Evidence

Despite saponins hypothesized to raise luteinizing hormone and testosterone, most controlled trials in healthy men, including athletes, show no significant change in serum testosterone. Reported sexual-function effects, where present, appear independent of any testosterone rise. This is a biomarker that tribulus generally does not move.

Effect size
No reliable effect
Time to effect
Not applicable
Best fit
none demonstrated
Less likely
healthy men and athletes seeking higher testosterone

Bottom line: Controlled trials generally show no testosterone increase in healthy men.

Evidence is mixed

A few early or animal studies suggested hormonal effects, but controlled human trials consistently find no meaningful testosterone change.

SourceRoaiah et al., 2017 — PubMed· conflictingNeychev et al., 2005 — PubMed· conflicting
SourceRoaiah et al., 2017 — PubMedNeychev et al., 2005 — PubMed

How it works

Tribulus terrestris contains steroidal saponins (most notably protodioscin), flavonoids, and other compounds traditionally associated with effects on hormonal and vascular systems. Protodioscin and related saponins have been hypothesized to enhance testosterone production by stimulating luteinizing hormone, though most controlled clinical trials in healthy men have not shown significant changes in serum testosterone levels. Proposed mechanisms also include effects on nitric oxide production and vascular endothelial function, which could underlie traditional claims about sexual function. Some laboratory studies suggest direct effects on androgen receptor activity or downstream steroid metabolism, but translation to consistent clinical effects has been limited. Most human trials in healthy young men, including athletes, have shown little or no effect on testosterone, muscle mass, or strength. Some trials in men with sexual dysfunction or post-menopausal women suggest possible modest improvement in libido or arousal, though evidence quality varies. Standardization of products to protodioscin content varies widely, making cross-study comparisons difficult.

How to take it

1. Typical dose
250–1,500 mg/day extract (often standardized to 20–95% saponins)
2. Timing
No strong time-of-day requirement; avoid late at night if it disturbs sleep
3. With food
With or without food; with meals may reduce GI upset
4. Split dosing
Typically divided 2–3 times daily
5. How long to try
4–12 weeks of consistent use before judging sexual-function effects

What to track

Libido and sexual satisfaction
GI tolerance and sleep
No reliable testosterone change to expect

3 commercial forms

Compare the main delivery options and what they’re best suited for.

Standardized extract (40-95% saponins)

Most common modern form. Look for products specifying protodioscin content for more reliable dosing.

Standardization to saponins or protodioscin content varies

Bulgarian tribulus (Tribestan-style)

Marketed as more potent due to selected plant material. Evidence remains mixed.

Traditional Bulgarian preparation, higher protodioscin

Whole plant powder

Traditional preparation. Variable saponin content.

Less concentrated than standardized extracts

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

Mild GI upsetNauseaTrouble sleeping

Serious risks

Who should avoid it

Pregnancy & breastfeeding

Avoid due to insufficient safety data and traditional cautions.

SourceMemorial Sloan Kettering — Tribulus Terrestris — MSKCC About Herbs

Interactions

Diabetes medicationsModerate

May enhance blood-sugar-lowering effects.

SourceMemorial Sloan Kettering — Tribulus Terrestris — MSKCC About Herbs
Antihypertensives and diureticsModerate

Possible additive blood-pressure effects.

SourceMemorial Sloan Kettering — Tribulus Terrestris — MSKCC About Herbs
LithiumModerate

May slow lithium clearance, raising levels.

SourceMemorial Sloan Kettering — Tribulus Terrestris — MSKCC About Herbs

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

Standardization to protodioscin or % saponins stated
Plant part identified (fruit vs aerial)
Third-party tested for identity and contaminants

Be skeptical of…

Testosterone-boosting or muscle-building claims
'Natural steroid' or guaranteed performance language

Frequently asked questions

Does tribulus actually raise testosterone?⌄

In most controlled trials of healthy men, including athletes, tribulus has not produced significant increases in serum testosterone. Marketing claims are not well supported by evidence in healthy individuals.

Can tribulus help with erectile dysfunction?⌄

Some trials in men with sexual dysfunction suggest modest subjective improvement. Tribulus is not a substitute for evaluated medical treatment of erectile dysfunction, and effects are typically smaller than prescription options.

Will tribulus help me build muscle?⌄

Controlled trials in resistance-trained athletes have not shown significant gains in muscle mass or strength with tribulus. Most evidence does not support its use as a muscle-building supplement.

Is tribulus safe long-term?⌄

Most studies have been relatively short (8 to 12 weeks). Long-term safety beyond several months is not well established. Rare reports of liver injury and gynecomastia warrant caution.

Who should avoid tribulus?⌄

Avoid in pregnancy, breastfeeding, hormone-sensitive cancers, and stop two weeks before surgery. Discuss with your clinician if you take prescription medications, especially for diabetes or blood pressure.

References by claim

male sexual function and libido

Kamenov et al., 2017 — PubMed (2017) link

Sansalone et al., 2014 — PMC (2014) link

female sexual function (postmenopausal)

Martimbianco et al., 2020 — PMC (2020) link

Postigo et al., 2016 — PMC (2016) link

testosterone elevation in healthy men

Roaiah et al., 2017 — PubMed (2017) link

Neychev et al., 2005 — PubMed (2005) link

Safety

Memorial Sloan Kettering — Tribulus Terrestris — MSKCC About Herbs link

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Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

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.