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Botanical & herbal supplements

Tribulus terrestris

Tribulus terrestris L. herb and extract

Tribulus terrestris is a thorny botanical sold as whole-herb and standardized extract products, often positioned around testosterone, libido and sports performance. Current human evidence does not support strong testosterone-boosting or nootropic claims, and sexual-function findings are low-certainty and population-specific. For buyers, the practical issues are extract standardization, label clarity around saponins or protodioscin, and caution around liver/kidney case reports, hormonal contexts, medicines and athlete product-quality risk.

Stress ResiliencePhysical PerformanceLibido VitalityHormone SupportGlucose MetabolismHormonal Axis RelatedWhole Herb
Updated August 2026/5 min read/8 citations
Reviewed by the NootropicsIndex editorial team.Method: prioritize cited human research and official safety or regulatory sources; compare retailer-listed prices without endorsing products.Affiliate disclosure
01

What is it?

What Tribulus terrestris is

1

Tribulus terrestris is a thorny plant sold as whole herb, powder, capsules and standardized extracts. Current listings include 40% saponin or 20% protodioscin claims, so compare the plant material and standardization claim rather than assuming all Tribulus products are equivalent.

02

Names, aliases and forms

Common NamesTribulus terrestris; Puncture vine; Caltrop
Latin NameTribulus terrestris L.
Ayurveda NameGokshura
Tcm NameBai ji li
Active Constituentprotodioscin
03

Mechanisms of action

Hormone marketing is stronger than the evidence

6

Tribulus is marketed around steroidal saponins, protodioscin and hormonal-axis claims. A 2025 systematic review did not establish a robust testosterone increase, so mechanism and label standardization should not be converted into a testosterone or nootropic promise.

04

Potential effects and evidence map

Tribulus is better understood as a libido/testosterone and sports-nutrition supplement than as a nootropic. Human trials and systematic reviews do not provide robust testosterone or performance support, while sexual-function signals are limited and condition-specific. Product comparison should therefore focus on what the label actually provides, such as whole herb versus extract, percent saponins or protodioscin, capsule strength and COA quality, while safety copy should stay conservative because liver/kidney case reports and insufficient toxicology data appear in official reviews.

Effect domainMagnitudeGrade
Libido / vitality6
CumulativeConfidence: Medium

Sexual-function evidence is mixed and population-specific, with low certainty overall.

Note Avoid disease claims and do not extrapolate to healthy libido or testosterone boosting.

2/5
C
Physical energy / endurance7
CumulativeConfidence: Medium

Sports-performance and body-composition support is weak despite common marketing.

Note CrossFit/resistance-training studies do not justify broad performance claims.

1/5
D
Mood / wellbeing1
UnknownConfidence: Medium

Tribulus should not be positioned as a mood or stress nootropic.

Note Traditional or hormonal marketing is not healthy mood evidence.

0/5
E
Focus / attention1
UnknownConfidence: High

There is no meaningful human evidence base for focus, attention or memory enhancement.

Note Keep nootropic claims explicitly weak.

0/5
E
05

Timing & effect horizon

Effect horizonUnknown
Unknown
No reliable nootropic onset or cycle6

A reliable public onset, acute duration or nootropic cycle is not established. Trial durations such as 6 to 12 weeks should not be turned into a general self-use cycle, especially when extract chemistry and study populations differ.

06

Safety, side effects and risk profile

Human safety data are limited3
Human safety research is limited. Isolated severe liver or kidney injury reports involved products containing Tribulus, but the exact product and individual context matter and direct causality remains uncertain.
Testosterone booster framing is not supported6
The 2025 systematic review did not establish a robust testosterone increase. The young-men trial is similarly limited to its four-week extract study. Do not turn these data into testosterone, muscle-building or cognitive-enhancement claims.
Liver / kidney caution3
Confidence: Low

Isolated severe liver or kidney injury reports involving Tribulus-containing products warrant caution, but direct causality is uncertain.

Note LiverTox does not find liver injury convincingly linked to typical-dose Tribulus; reports may be confounded by product composition or underlying disease.

2/5
D
Interaction risk2
Confidence: Medium

Potential interactions have been reported with diuretics, antihypertensives, antidiabetics and clopidogrel.

Note Several reported interaction mechanisms have uncertain clinical relevance; use product-specific pharmacist or clinician review.

2/5
D
Pregnancy / lactation caution4
Confidence: Medium

Safety in pregnancy and lactation has not been established; EMA does not recommend use because sufficient data are absent.

Note This is a data-gap caution, not evidence of a quantified harm.

3/5
D
GI discomfort2
Confidence: Medium

GI upset is a practical dose-limiting concern with herbal extracts.

Note Mention as a common practical tolerance issue without overclaiming.

2/5
C
Legal / regulatory risk8
Confidence: High

U.S. supplement availability is not FDA preapproval, and international status/athlete rules vary.

Note Jurisdiction-scoped legal copy checked 2026-06-29.

2/5
B
Evidence uncertainty6
Confidence: High

Benefit claims are weaker than testosterone-booster marketing suggests.

Note Keep testosterone, sports and nootropic claims conservative.

4/5
A
07

Interactions and cautions

Interaction check2

MSKCC notes potential interactions with diuretics, antihypertensives, antidiabetics and clopidogrel; for several, clinical relevance is unknown. Discuss a specific Tribulus product and medicine with a pharmacist or clinician.

08

Legal and regulatory status

United States8

As of 2026-08-01, products marketed in the United States as dietary supplements are not FDA-approved for safety or effectiveness before sale.

09

Practical buying and quality notes

  • As of 2026-08-01, the active catalog includes whole-herb powders, standardized extracts and capsule products. Separate stated 40% saponin or 20% protodioscin products from unspecified herb or extract listings. Do not use malformed bulk normalization, zero-dose fields, stale crawls or missing crawl dates as a current price or active-milligram ranking.1
  • Match documentation to the claim: check the plant part, extract identity, stated marker compound and available contaminant or third-party testing. Be especially cautious with blends marketed around testosterone because product quality can vary beyond the herb name.2
10

FAQ

Is Tribulus terrestris a nootropic?

1

Not in a meaningful focus or memory sense. It is mainly a libido/testosterone and sports-performance marketed botanical, and the human nootropic evidence is weak.

Does Tribulus raise testosterone?

6

Do not assume that. The 2025 systematic review did not establish a robust testosterone increase, even though many product labels use testosterone-booster language.

What Tribulus dose should I compare?

7

There is no universal dose to compare across whole herb and distinct extracts. Start with the label's serving size, plant part, extract identity and stated marker compound; do not scale a bulk powder upward merely because it is cheaper per gram.

Who should avoid Tribulus supplements?

4

EMA notes that safety in pregnancy and lactation has not been established and does not recommend use because sufficient data are absent.

What should I check before buying a Tribulus extract?

2

Check the plant part, extract ratio if provided, percent saponins, protodioscin claim, capsule strength, serving math, lot-specific COA, contaminant tests and whether the vendor is making aggressive testosterone or medical claims.

Is Tribulus safe for athletes?

1

Athletes should be cautious with testosterone-booster products and verify sport rules, third-party testing, ingredient lists and contamination risk. Product category and blend quality can matter as much as the herb name.

11

References

  1. Operation Supplement Safety. Tribulus terrestris as an ingredient in dietary supplements.
  2. Memorial Sloan Kettering Cancer Center. Tribulus terrestris.
  3. LiverTox. Tribulus. NCBI Bookshelf.
  4. European Medicines Agency HMPC. Final assessment report on Tribulus terrestris L., herba.
  5. Neychev VK, Mitev VI. Tribulus terrestris extract and androgen production in young men. J Ethnopharmacol. 2005.
  6. Vilar Neto JdO, et al. Tribulus supplementation, male sexual-function outcomes and testosterone levels: systematic review of clinical trials. Nutrients. 2025.
  7. Ribeiro AS, et al. Six-week Tribulus terrestris supplementation in CrossFit-trained males: randomized placebo-controlled trial. Nutrients. 2021.
  8. U.S. Food and Drug Administration. Information for Consumers on Using Dietary Supplements.
Note

This page is informational and summarizes available evidence. It is not medical advice, a recommendation, or a substitute for guidance from a qualified clinician.