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Dietary supplement

Tribulus Ingredients & Drug Interactions

by Sierra Fit

Tribulus 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 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 Sierra Fit 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 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 Sierra Fit

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

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HelloPharmacist Scorecard of Tribulus by Sierra Fit

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.

Sierra Fit Tribulus contains one active ingredient: tribulus terrestris extract, a plant-based compound traditionally used for sexual function and athletic performance. The capsule also includes several inactive ingredients — vegetable cellulose, microcrystalline cellulose, gum arabic, sunflower oil, rice extract, and rice hulls — which are fillers and binders that help form and stabilize the capsule.

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 has possibly effective evidence for sexual dysfunction — that's the main reason people use it, and the data suggests it may help. For athletic performance, however, the evidence points to possibly ineffective, meaning it's unlikely to boost your workout results.

For benign prostatic hyperplasia (enlarged prostate), we don't have enough reliable evidence to rate 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.

Tribulus is generally well tolerated in the short term for healthy adults, but quality and long-term safety data are limited, so we don't have a full picture of how safe it is with long-term use. Common mild side effects can include abdominal pain, cramping, nausea, vomiting, diarrhea, and constipation — though in one study these complaints occurred at rates similar to placebo.

Rare serious effects like liver and kidney injury and seizures have been reported, as have cases of prolonged painful erections. Avoid tribulus during pregnancy because it may affect hormones and safety is not established.

Also avoid it while breastfeeding due to lack of reliable 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 taking Sierra Fit Tribulus, double-check blood pressure medications (antihypertensives), diabetes medications (antidiabetes drugs), and lithium with your own doctor or pharmacist. All three are Moderate severity interactions and could require dose adjustments or careful 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, but it's not proven for athletic performance. If you take blood pressure medication, diabetes medication, or lithium, you need to check with your own doctor or pharmacist before starting — the interactions can be serious.

For healthy adults not on those medications, it's generally well tolerated short-term, though long-term safety data are limited.

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 Aug 23, 2022.

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 Sierra Fit
Barcode (UPC) 898220017553
Net contents 90 Veggie Capsule(s)
Market status On market
Date entered into DSLD Aug 23, 2022
DSLD ID 272543
Product type Botanical
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Gluten Free, Dairy Free, Sugar 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 by Sierra Fit, 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:
2 Capsule(s)
Maximum serving Sizes:
2 Capsule(s)
Servings per container
45
UPC/BARCODE
898220017553
IngredientAmount% DV
Tribulus terrestris extract1000 mg--

Other ingredients: Vegetable Cellulose, Microcrystalline Cellulose, Gum Arabic, Sunflower Oil, Rice extract, Rice hulls

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

0 calories 0 sugars 0 carbohydrates

Non-GMO Gluten-free

This product is not manufactured with milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soy or gluten.

Suggested/Recommended/Usage/Directions

Directions: Adults, take 2 capsules daily, or as directed by your healthcare professional.

Precautions

Warnings: Keep out of reach of children.

Consult a medical doctor before starting a diet, an exercise program, have a medical condition, or are taking any medications such as blood thinners or daily aspirin.

Sealed for your protection Do not use if seal is missing or broken.

This product is not manufactured with milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soy or gluten. Produced in a third-party, audited and registered cGMP compliant facility that may process other products that contain these allergens or ingredients.

Storage

Protect from heat, light, and moisture.

FDA Statement of Identity

Dietary Supplement

Formula

Standardized extract minimum 45% saponins

Brand IP Statement(s)

Sierra Fit is a trademark of Madre Labs, LLC

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

See for yourself

Tribulus by Sierra Fit 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 Sierra Fit

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

Serving size2 Capsule(s) Dosage formCapsule Servings per container45 Amounts shown are per serving.

Tribulus terrestris extract

Interacts with
259 drugs
1000 mg per serving Form: 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 extract monograph & interactions

Other (inactive) ingredients: Vegetable Cellulose, Microcrystalline Cellulose, Gum Arabic, Sunflower Oil, Rice extract, Rice hulls. These complete the product’s ingredient list but are not active constituents.

Interaction report

Tribulus by Sierra Fit 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

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. 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.

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
Tribulus terrestris extract full monograph & interactions
The maker

Brand information

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

Sierra Fit

See all Sierra Fit products
Name
Madre Labs, LLC
Street Address
301 N. Lake Ave. #600
City
Pasadena
State
CA
ZipCode
91101
Web Address
www.Sierra-Fit.com
Pharmacist Counseling Corner

Tribulus by Sierra Fit: Common Questions

Does Tribulus by Sierra Fit 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 trying to conceive or might be pregnant?
No. The safety data advises against tribulus during pregnancy because it may affect hormones and safety is not established. Talk with your doctor or pharmacist about alternatives if you're pregnant or planning to become pregnant.
Is Tribulus safe to use while breastfeeding?
No. There isn't enough reliable safety information to recommend it while breastfeeding. Discuss this with your own doctor or pharmacist before taking it.
What are the most common side effects?
Most common mild side effects are abdominal pain, cramping, nausea, vomiting, diarrhea, and constipation. Interestingly, in one study these occurred at similar rates in people taking tribulus and those taking placebo, so they may not be directly caused by the supplement.
Does Tribulus actually work for sexual dysfunction?
The evidence says possibly effective — meaning some research supports it may help, but more robust studies would strengthen that claim. Results vary person to person.
Will Tribulus improve my athletic performance?
The evidence points to possibly ineffective, so it's unlikely to boost your workout results or strength gains.
How long have people been taking this supplement safely?
Tribulus is generally well tolerated in the short term, but quality and long-term safety data are limited — so we don't have a clear picture of how safe it is with months or years of regular use.

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

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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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