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Dietary supplement

Tribulus 500 mg Ingredients & Drug Interactions

by NutraBio

Tribulus 500 mg label
See full label image
Capsule Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 23, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Tribulus 500 mg 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 500 mg is a dietary supplement by NutraBio 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 Tribulus Terrestris standardized 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 500 mg by NutraBio

Ask about any prescription or over-the-counter medication and we check it for interactions with Tribulus 500 mg by NutraBio — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Tribulus 500 mg by NutraBio

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 Sep 17, 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 500 mg of tribulus terrestris standardized extract — the only active ingredient. Tribulus is a plant historically used in traditional medicine, and this version is standardized, meaning it's tested to deliver a consistent level of its active compounds.

The capsule itself is made from vegetable material.

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

This product doesn't appear to be marketed for a specific use, so we graded Tribulus's overall clinical evidence instead.

Moderate

Some clinical evidence supports Tribulus for:

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.
  • Since the label doesn't commit to one use, we graded the ingredient's overall clinical evidence instead.
  • On file: Sexual dysfunction — rated "Possibly Effective" (Natural Medicines).

Tribulus shows possibly effective evidence for sexual dysfunction — multiple trials support this use. For athletic performance, the evidence suggests it's possibly ineffective.

For benign prostatic hyperplasia (enlarged prostate), we don't have enough reliable evidence to know whether it works.

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.

Short-term use in healthy adults is generally well tolerated, but quality data and long-term safety information are limited. Rare serious side effects have been reported, including liver and kidney injury, seizures, and in one case of extreme overconsumption, acute kidney failure.

More common mild effects — when they occur — are stomach pain, cramping, nausea, vomiting, diarrhea, or constipation, though one study found these rates similar to placebo. Avoid this product during pregnancy because it may affect hormone levels and safety hasn't been established.

Also avoid while breastfeeding due to lack of reliable safety data. If you're pregnant, planning pregnancy, or breastfeeding, talk with your doctor or pharmacist before considering tribulus.

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 taking this product, double-check with your doctor or pharmacist if you're on blood pressure medications (antihypertensives) or diabetes medications (antidiabetes drugs) — tribulus can strengthen their effects and raise the risk of dangerously low blood pressure or blood sugar. If you take lithium for mood disorders, tribulus may increase lithium levels in your blood.

Do not combine these without your prescriber's approval and monitoring.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with some supporting evidence behind its ingredients' uses. Moderate medication interactions have been identified, and safety information is well characterized.

Tribulus may help with sexual dysfunction, though evidence is modest. It's a reasonable option if you're generally healthy and not taking blood pressure medications, diabetes drugs, or lithium.

Before you start, check your complete medication list with your doctor or pharmacist to make sure none of your drugs interact with it. If you're pregnant or breastfeeding, skip it and discuss alternatives with your healthcare provider.

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 Apr 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 500 mg, straight from the product label.

Brand NutraBio
Barcode (UPC) 649908234164
Net contents 150 Veggie Capsule(s)
Market status On market
Date entered into DSLD Apr 22, 2021
DSLD ID 248246
Product type Botanical
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Vegetarian, Adult (18 - 50 Years), Kosher, No Allergies, Gluten Free, Dairy Free
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 500 mg by NutraBio, 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
150
UPC/BARCODE
649908234164
IngredientAmount% DV
Tribulus Terrestris standardized extract500 mg--

Other ingredients: Vegetable Capsule

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.
Suggested/Recommended/Usage/Directions

Suggested use: As a dietary supplement, take 1 capsule daily as needed or as directed by your physician.

Formulation

Vegetarian

Gluten free Non-GMO Lactose free No excipients, no fillers, allergen free, no artificial color, flavor or sweetener, no preservatives, no starch, no sugar, no soy, no wheat, no yeast, no fish, no milk, sodium free.

Manufactured in our GMP & FDA Inspected facility FDA Registration: 16906175560

Precautions

Warning: Not intended for use by persons under the age of 18. Keep out of the reach of children.

If you are pregnant, breast feeding, have known medical conditions (including kidney or liver disease) or are taking prescription or OTC medication(s) consult with your health care practitioner before using this product.

Discontinue use two weeks prior to surgery.

General Statements

Since 1996

Seals/Symbols

Made in USA with ingredients sourced worldwide

OU (Kosher)

Formula

Tribulus terrestris 60% steroidal saponins

OU (Kosher)

FDA Statement of Identity

Dietary Supplement

Storage

Store in a cool dry place.

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.

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

See for yourself

Tribulus 500 mg by NutraBio label

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

Tribulus 500 mg 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 500 mg by NutraBio

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 container150 Amounts shown are per serving.

Tribulus Terrestris standardized extract

Interacts with
259 drugs
500 mg per serving Form: Steroidal Saponins

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

Tribulus Terrestris standardized extract monograph & interactions

Other (inactive) ingredients: Vegetable Capsule. These complete the product’s ingredient list but are not active constituents.

Interaction report

Tribulus 500 mg by NutraBio Drug Interactions

Want to check YOUR meds against Tribulus 500 mg?

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

Tribulus Terrestris standardized extract 259

Individual Drug Interactions

The ingredients in Tribulus 500 mg interact with 259 drugs. Click any drug to see the details.

1 of the 1 ingredient in Tribulus 500 mg interact with drugs. Each result below shows which ingredient is responsible. Tribulus Terrestris standardized extract

Each ingredient & the kinds of drugs it affects

For each ingredient in Tribulus 500 mg 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.

Tribulus Terrestris standardized 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
Tribulus Terrestris standardized extract full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Tribulus 500 mg, from the product label.

NutraBio

See all NutraBio products
Name
NutraBio Labs, Inc.
Street Address
564 Lincoln Blvd.
City
Middlesex
State
NJ
ZipCode
08846
Phone Number
732-748-8606
Web Address
www.nutrabio.com
Pharmacist Counseling Corner

Tribulus 500 mg by NutraBio: Common Questions

Does Tribulus 500 mg by NutraBio interact with any medications?
Yes. Based on its ingredients, Tribulus 500 mg 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 500 mg 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.
Does tribulus actually work for sexual function?
Evidence says it's possibly effective — some clinical trials support it, but the evidence is not definitive. If you're interested in trying it, give it a reasonable trial period and see how you respond.
What are the most common side effects?
Mild stomach upset — cramping, nausea, or constipation — can happen, but one study found these complaints occurred at similar rates in people taking tribulus and those on placebo. Most people tolerate it well short-term.
Is tribulus safe to take long-term?
Safety data for long-term use is limited. It's generally well tolerated over short periods in healthy adults, but we don't have strong evidence for safety beyond that. If you plan to use it long-term, discuss it with your doctor or pharmacist.
Can I take this if I'm trying to get pregnant?
No — avoid tribulus during pregnancy because it may affect hormones and safety hasn't been established. If you're planning pregnancy or currently pregnant, talk with your doctor or pharmacist before taking any supplement.
Does tribulus help with athletic performance?
Evidence suggests it's possibly ineffective for that purpose, so it's not a reliable choice if muscle gain or performance is your goal.
What if I take this with my blood pressure medication?
Don't combine them without checking with your doctor first — tribulus lowers blood pressure on its own, and taking both could cause your pressure to drop dangerously low. Your prescriber may need to adjust your medication or monitor you closely.

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

Not sure if Tribulus 500 mg is safe with your meds?

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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 500 mg label
Go deeper

The Full Monographs Behind Tribulus 500 mg’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 500 mg'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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