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Dietary supplement

Tribulus Ingredients & Drug Interactions

by Gaspari Nutrition

Tribulus label
See full label image
Capsule Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 9, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Tribulus against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Tribulus is a dietary supplement by Gaspari Nutrition with 1 active ingredient. Its ingredients are commonly taken for low libido and sexual function, athletic performance and muscle building, testosterone support.Based on those ingredients, 259 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Bulgarian Tribulus terrestris extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Tribulus by Gaspari Nutrition

Ask about any prescription or over-the-counter medication and we check it for interactions with Tribulus by Gaspari Nutrition — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Tribulus by Gaspari Nutrition

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 11, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

This product contains one active ingredient: Bulgarian Tribulus terrestris extract, a plant used traditionally for sexual function and athletic performance. The rest of the capsule is made up of inactive ingredients—gelatin, vegetable cellulose, silicon dioxide, vegetable magnesium stearate, and talc—which are fillers and binders that hold the capsule together.

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: increase testosterone and enhance sexual function.
  • We looked for evidence on: Erectile dysfunction (ED), Male infertility, Premature ejaculation, Sexual dysfunction, Athletic performance, Exercise-induced muscle damage — and 3 related terms.
  • The strongest evidence on file: Tribulus is rated "Possibly Effective" for Sexual dysfunction (Natural Medicines).
  • Also on file: Tribulus is rated "Possibly Ineffective" for Athletic performance.
  • Also on file: Tribulus is rated "Insufficient Reliable Evidence To Rate" for Erectile dysfunction (ED), Premature ejaculation, Male infertility, Exercise-induced muscle damage.

The evidence for tribulus is mixed. For sexual dysfunction, it's rated possibly effective, meaning there's some supporting research but it's not conclusive.

For athletic performance, the data suggests it's possibly ineffective. For benign prostatic hyperplasia (an enlarged prostate), we don't have enough reliable evidence to say either way.

The evidence, ingredient by ingredient Tribulus

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Tribulus is generally well tolerated in short-term use by healthy adults, though long-term safety data are limited and quality can vary between products. Serious side effects are rare but have been reported—including liver or kidney injury, seizures, and in one case, a patient who drank large amounts of tribulus water developed weakness, seizures, and kidney injury.

More common mild side effects may include stomach pain, cramping, nausea, vomiting, diarrhea, or constipation, though in one study these occurred at similar rates in people taking tribulus and placebo. Avoid tribulus during pregnancy because it may affect hormones and safety hasn't been established.

Also avoid it while breastfeeding due to lack of safety information.

Side effects, ingredient by ingredient Tribulus

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Tribulus.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: diabetes medications; lithium.
  • For scale: 259 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Before you take this, double-check with your pharmacist if you're on blood pressure medication, diabetes medication, or lithium. Tribulus can intensify the effects of all three, which could lower your blood pressure, blood sugar, or lithium levels too much.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

Tribulus may be worth considering if you're interested in sexual function support, though the evidence is modest. If you take blood pressure medication, diabetes medication, or lithium, talk to your pharmacist before starting—this product could affect how those drugs work.

Quality and long-term safety data are thin, so think of it as a short-term option.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Oct 22, 2021.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Tribulus, straight from the product label.

Brand Gaspari Nutrition
Barcode (UPC) 646511025219
Net contents 90 Capsule(s)
Market status On market
Date entered into DSLD Oct 22, 2021
DSLD ID 255764
Product type Botanical
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years)
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Tribulus by Gaspari Nutrition, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
1 Capsule(s)
Maximum serving Sizes:
1 Capsule(s)
Servings per container
30
UPC/BARCODE
646511025219
IngredientAmount% DV
Bulgarian Tribulus terrestris extract850 mg--

Other ingredients: Gelatin, Vegetable Cellulose, Silicon Dioxide, Vegetable Magnesium Stearate, Talc

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Formulation

The active steroidal saponins found within Tribulus Terrestris have been shown to: Increase testerone Enhance luteinizing hormone production Augment sex drive Boost muscle power & strength

Daily use of this incredible herb may help augment your sex drive, increase lean muscle mass, and enhance strength and power.

Made in the USA from domestic and international ingredients.

General Statements

Gaspari Nutrition's Tribulus is the premier option for those looking for the most powerful Tribulus Terrestris extract available on the market.

Formula

As with all Gaspari products, Tribulus is made using only the highest quality active ingredients, providing users with unmatched levels of the powerful steroidal saponins naturally found in Tribulus Terrestris.

650mg at 90% standardization Ultra high Bulgarian Tribulus Extract

FDA Disclaimer Statement

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Brand IP Statement(s)

2018 Gaspari Nutrition LLC- All rights reserved.

FDA Statement of Identity

Dietary Supplement

Suggested/Recommended/Usage/Directions

With meals Pre During Post Between meals

Suggested Use: As a dietary supplement, take 1 capsule upon waking, 1 capsule mid-day, and 1 capsule prior to sleep. Use Tribulus for 8-12 weeks before ceasing for at least 4 weeks.

Precautions

As a reminder, discuss the supplements and medications you take with your healthcare providers.

Warning: This product is only intended to be consumed by healthy individuals over the age of 18 years.

If you are pregnant or nursing, taking any medication or have any medical condition, consult your doctor before use.

Discontinue use and consult your doctor if any adverse reactions occur.

Keep out of reach of children.

Tamper evident: Do not use if seal under cap is broken or missing.

Storage

Store in a cool, dry place.

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Tribulus by Gaspari Nutrition label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Tribulus label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Tribulus by Gaspari Nutrition

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size1 Capsule(s) Dosage formCapsule Servings per container30 Amounts shown are per serving.

Bulgarian Tribulus terrestris extract

Interacts with
259 drugs
850 mg per serving

Tribulus is a plant supplement most often marketed to boost libido, testosterone, and athletic performance, but the human evidence behind these claims...

Bulgarian Tribulus terrestris extract monograph & interactions

Other (inactive) ingredients: Gelatin, Vegetable Cellulose, Silicon Dioxide, Vegetable Magnesium Stearate, Talc. These complete the product’s ingredient list but are not active constituents.

Interaction report

Tribulus by Gaspari Nutrition Drug Interactions

Want to check YOUR meds against Tribulus?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
259Drugs
259 Moderate

Ingredients driving the most interactions

Bulgarian Tribulus terrestris extract 259

Individual Drug Interactions

The ingredients in Tribulus interact with 259 drugs. Click any drug to see the details.

1 of the 1 ingredient in Tribulus interact with drugs. Each result below shows which ingredient is responsible. Bulgarian Tribulus terrestris extract

Each ingredient & the kinds of drugs it affects

For each ingredient in Tribulus with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Bulgarian Tribulus terrestris extract3 drug types · 259 drugs

Antidiabetes Drugs

Taking tribulus with antidiabetes drugs might increase the risk of hypoglycemia.
Clinical research shows that Tribulus can lower blood glucose levels in adults with type 2 diabetes who are taking antidiabetes medications.

Likelihood Possible Evidence D
Antihypertensive Drugs

Theoretically, taking tribulus with antihypertensive drugs might increase the risk of hypotension.
Animal research shows that tribulus can lower blood pressure by inhibiting angiotensin-converting enzyme (ACE). Tribulus has also demonstrated hypotensive effects in pre-hypertensive adults.

Likelihood Possible Evidence D
Lithium

Theoretically, tribulus might increase the levels and clinical effects of lithium.
Tribulus is thought to have diuretic properties. Due to these potential diuretic effects, tribulus might reduce excretion and increase levels of lithium. The dose of lithium might need to be decreased.

Likelihood Probable Evidence D
Bulgarian Tribulus terrestris extract full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Tribulus, from the product label.

Gaspari Nutrition

See all Gaspari Nutrition products
Name
Gaspari Nutrition, Inc.
Street Address
595 Prospect St., Suite 301
City
Lakewood
State
NJ
ZipCode
08701
Phone Number
1.732.364.3777
Web Address
www.gasparinutrition.com
Pharmacist Counseling Corner

Tribulus by Gaspari Nutrition: Common Questions

Does Tribulus by Gaspari Nutrition interact with any medications?
Yes. Based on its ingredients, Tribulus has a known interaction with 259 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Tribulus contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Can I take Tribulus if I'm pregnant or breastfeeding?
No. The safety data advise against it during pregnancy because tribulus may affect hormones and safety hasn't been established. You should also avoid it while breastfeeding due to lack of reliable safety information. Talk with your doctor or pharmacist about whether it's right for you.
Does tribulus actually work for sexual dysfunction?
The evidence suggests it's possibly effective, meaning there's some research supporting its use but it's not conclusive. Your results may vary, and it's not a guaranteed fix.
What are the side effects?
Most people tolerate it well. Mild side effects like stomach pain, cramping, nausea, vomiting, diarrhea, or constipation can occur, though one study found these happened about as often with placebo. Rare serious effects—liver or kidney injury and seizures—have been reported, so long-term use needs caution.
Is this product safe for athletic performance?
The evidence suggests tribulus is possibly ineffective for boosting athletic performance, so it may not give you the edge you're looking for in that area.
Does this contain fillers?
Yes. The capsule includes gelatin, vegetable cellulose, silicon dioxide, vegetable magnesium stearate, and talc as inactive ingredients to hold it together.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if Tribulus is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Tribulus label
Go deeper

The Full Monographs Behind Tribulus’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Tribulus

Interacts with 259 drugs

Tribulus is a plant supplement most often marketed to boost libido, testosterone, and athletic performance, but the human evidence behind these claims is weak and inconsistent. It is general...

Read the full Tribulus monograph →
Sources

Sources & How We Checked

Tribulus's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 10 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Tribulus 10 references
  1. Sharifi AM, Darabi R, Akbarloo N. Study of antihypertensive mechanism of Tribulus terrestris in 2K1C hypertensive rats: role of tissue ACE activity. Life Sci 2003;73:2963-71. PubMed
  2. Walker D, Bird A, Flora T, O'Sullivan B. Some effects of feeding Tribulus terrestris, Ipomoea lonchophylla and the seed of Abelmoschus ficulneus on fetal development and the outcome of pregnancy in sheep. Reprod Fertil Dev 1992;4:135-44. PubMed
  3. Al-Ali M, Wahbi S, Twaij H, Al-Badr A. Tribulus terrestris: preliminary study of its diuretic and contractile effects and comparison with Zea mays. J Ethnopharmacol 2003;85:257-60. PubMed
  4. Tabakova, P., Dimitrov, M., Ognyanov, K., and et al. Clinical study of Tribestan in females with endocrine sterility. Documentation for Registration (unpublished) 1999.
  5. Akhtari E, Raisi F, Keshavarz M, et al. Tribulus terrestris for treatment of sexual dysfunction in women: randomized double-blind placebo-controlled study. Daru 2014;22:40. PubMed
  6. Ryan M, Lazar I, Nadasdy GM, et al. Acute kidney injury and hyperbilirubinemia in a young male after ingestion of Tribulus terrestris. Clin Nephrol 2015;83(3):177-83. PubMed
  7. Postigo S, Lima SM, Yamada SS, et al. Assessment of the effects of Tribulus terrestris on sexual function of menopausal women. Rev Bras Ginecol Obstet 2016;38(3):140-6. PubMed
  8. Talasaz AH, Abbasi MR, Abkhiz S, Dashti-Khavidaki S. Tribulus terrestris-induced severe nephrotoxicity in a young healthy male. Nephrol Dial Tranplant 2010;25(11):3792-3. PubMed
  9. Samani NB, Jokar A, Soveid M, Heydari M, Mosavat SH. Efficacy of the hydroalcoholic extract of Tribulus terrestris on the serum glucose and lipid profile of women with diabetes mellitus: a double-blind randomized placebo-controlled clinical trial. J Evid
  10. Siddiqui MA, Itrat M, Mobeen A, Khan MI. Efficacy of khar-i-khasak (Tribulus terrestris Linn.) in prehypertension: a randomized, double-blind, placebo-controlled trial. J Complement Integr Med. 2021.

See these in context on the Tribulus monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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