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Dietary supplement

Standardized Oregano Oil Ingredients & Drug Interactions

by Olympian Labs Incorporated

Standardized Oregano Oil label
See full label image
Liquid Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Standardized Oregano Oil 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

Standardized Oregano Oil is a dietary supplement by Olympian Labs Incorporated with 1 active ingredient. Its ingredients are commonly taken for digestive upset, respiratory and cold symptoms, antimicrobial support.Based on those ingredients, 208 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Pure Oregano Oil. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Standardized Oregano Oil by Olympian Labs Incorporated

Ask about any prescription or over-the-counter medication and we check it for interactions with Standardized Oregano Oil by Olympian Labs Incorporated — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Standardized Oregano Oil by Olympian Labs Incorporated

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: pure oregano oil. It's a concentrated extract of the oregano plant, much more potent than the dried herb you'd sprinkle on pizza or pasta.

There are no inactive ingredients listed for this supplement.

Does it work?

Not established
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
Not established

The graded evidence we hold for these ingredients covers different conditions than the ones this product is marketed for, so there's no established rating for its stated use — see Oregano's own graded uses on its monograph.

Why this rating?
  • The label markets this product for: Digestive aid and cough remedy with antimicrobial properties.
  • We looked for evidence on: Cough, Dyspepsia, Upper respiratory tract infection (URTI), Bronchitis, Intestinal parasite infection, Tinea corporis — and 4 related terms.
  • The closest evidence on file: Oregano is rated "Insufficient Reliable Evidence To Rate" for Bronchitis (Natural Medicines).
  • Also on file: Oregano is rated "Insufficient Reliable Evidence To Rate" for Upper respiratory tract infection (URTI), Cough, Dyspepsia, Intestinal parasite infection, and more.

The evidence we have doesn't support oregano oil for acne, bronchitis, asthma, headache, or upper respiratory tract infections. For all of these uses, the research is currently insufficient to rate it either way.

That doesn't mean it doesn't work—it means we don't have reliable data yet.

The evidence, ingredient by ingredient Oregano

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.

Oregano from food is well tolerated, but concentrated supplement oils are stronger and haven't been studied as thoroughly. The most common side effect from oral use is gastrointestinal upset.

Rarely, people sensitive to oregano or other plants in the mint family (Lamiaceae) have had serious allergic reactions, including anaphylaxis, after ingesting it. The safety data advises against taking medicinal or supplement amounts during pregnancy; food amounts are likely fine.

For breastfeeding, we don't have enough information to know whether supplement doses are safe—talk with your doctor or pharmacist about what's right for you. Topically, oregano oil can cause skin irritation or allergic contact dermatitis in sensitive people, especially at concentrations above 1%.

Side effects, ingredient by ingredient Oregano

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 — Oregano.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; diabetes medications.
  • For scale: 208 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.

Check before starting if you take blood thinners or antiplatelet drugs—oregano oil may increase bleeding risk. Also check if you're on diabetes medications, since oregano could lower your blood sugar further.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no established evidence rating for its marketed use. Moderate medication interactions have been identified, and safety information is well characterized.

This oregano oil supplement might appeal to someone looking for a concentrated herbal product, but the evidence for its claimed uses isn't established yet. If you take blood thinners, antiplatelet drugs, or diabetes medications, check with us before starting it.

Pregnant or breastfeeding? Same conversation with your pharmacist.

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 Jun 1, 2012.

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 Standardized Oregano Oil, straight from the product label.

Brand Olympian Labs Incorporated
Barcode (UPC) 710013004635
Net contents 2 fl. Oz.
Market status On market
Date entered into DSLD Jun 1, 2012
DSLD ID 9771
Product type Botanical
Supplement form Liquid
Dietary claims / uses All Other
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 Standardized Oregano Oil by Olympian Labs Incorporated, 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:
0.14 Gram(s)
Maximum serving Sizes:
0.14 Gram(s)
Servings per container
300
UPC/BARCODE
710013004635
IngredientAmount% DV
Calories1 cal--
Calories from Fat1 cal--
Total Fat140 mg1%
Saturated Fat0 mg--
Cholesterol0 mg--
Pure Oregano Oil140 mg--

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:Take as needed, for (4) drops daily mixed with water, juice or olive oil. Olympian Lab's Oregano Oil is also designed to be added with your food for extra flavor while experiencing great health benefits. Do not take undiluted as this is a pure oregano extract. Heat sensation is normal. As with any natural product, aroma, taste and consistency may vary.

General Statements

Traditionally, Oregano Oil has been used as a digestive aid and cough remedy. It is also known for its anti-microbial and anti-fungal properties.

All Natural

Made in USA

Precautions

KEEP OUT OF REACH OF CHILDREN.

Seals/Symbols

Since 1992 OL

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

See for yourself

Standardized Oregano Oil by Olympian Labs Incorporated label

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

Standardized Oregano Oil 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 Standardized Oregano Oil by Olympian Labs Incorporated

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

Serving size0.14 Gram(s) Dosage formLiquid Servings per container300 Amounts shown are per serving.

Pure Oregano Oil

Interacts with
208 drugs
140 mg per serving Form: Carvacrol

Oregano is a common Mediterranean cooking herb that is also sold as a concentrated oil or supplement, often standardized for a compound called carvacr...

Pure Oregano Oil monograph & interactions
Interaction report

Standardized Oregano Oil by Olympian Labs Incorporated Drug Interactions

Want to check YOUR meds against Standardized Oregano Oil?

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
208Drugs
208 Moderate

Ingredients driving the most interactions

Pure Oregano Oil 208

Individual Drug Interactions

The ingredients in Standardized Oregano Oil interact with 208 drugs. Click any drug to see the details.

1 of the 1 ingredient in Standardized Oregano Oil interact with drugs. Each result below shows which ingredient is responsible. Pure Oregano Oil

Each ingredient & the kinds of drugs it affects

For each ingredient in Standardized Oregano Oil 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.

Pure Oregano Oil2 drug types · 208 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, oregano might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
In vitro research shows that aristolochic acid isolated from oregano leaves has antithrombin activity. It has also been reported that oregano oil inhibits arachidonic acid-induced, and ADP-induced, platelet aggregation.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, oregano might increase the risk for hypoglycemia when taken with antidiabetes drugs.
In vitro and animal research shows that oregano extracts might lower blood glucose levels.

Likelihood Possible Evidence D
Pure Oregano Oil full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Standardized Oregano Oil, from the product label.

Olympian Labs Incorporated

See all Olympian Labs Incorporated products
Name
OLYMPIAN LABS INCORPORATED
Street Address
P.O. Box 12461
City
Scottsdale
State
AZ
ZipCode
85267
Phone Number
1-800-473-5883
Web Address
www.olympianlabs.com
Pharmacist Counseling Corner

Standardized Oregano Oil by Olympian Labs Incorporated: Common Questions

Does Standardized Oregano Oil by Olympian Labs Incorporated interact with any medications?
Yes. Based on its ingredients, Standardized Oregano Oil has a known interaction with 208 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Standardized Oregano Oil 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 oregano oil really work for colds or bronchitis?
The research we have on that isn't reliable enough to say yet. It's a popular folk remedy, but we don't have solid evidence that oregano oil actually helps with those conditions.
What's the most common side effect?
Gastrointestinal upset—nausea, stomach discomfort, that kind of thing. Most people tolerate it fine when they use food amounts of oregano, but concentrated supplements are stronger.
Is it safe to take oregano oil if I'm pregnant?
The safety data advises against medicinal or supplement amounts during pregnancy. Food amounts—the oregano in your cooking—are likely fine, but talk with your pharmacist or doctor about what's safe for your situation.
Can I be allergic to oregano oil?
Yes. Serious allergic reactions are rare, but they've been reported—including anaphylaxis. If you're sensitive to plants in the mint family (like thyme or basil), you may be at higher risk. Stop immediately and seek help if you feel swelling, difficulty breathing, or rash.
How is oregano oil different from the dried oregano I cook with?
This supplement is a concentrated extract—much more potent than the spice in your kitchen. That's why it's more likely to cause side effects and interact with medications, and why we know less about its safety at high doses.

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

Not sure if Standardized Oregano Oil 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.

Standardized Oregano Oil label
Go deeper

The Full Monographs Behind Standardized Oregano Oil’s Ingredients

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

Herb & supplement monograph

Oregano

Interacts with 208 drugs

Oregano is a common Mediterranean cooking herb that is also sold as a concentrated oil or supplement, often standardized for a compound called carvacrol. While lab studies suggest it may hav...

Read the full Oregano monograph →
Sources

Sources & How We Checked

Standardized Oregano Oil'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 12 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.

Oregano 12 references
  1. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  2. Benito M, Jorro G, Morales C, et al. Labiatae allergy: systemic reactions due to ingestion of oregano and thyme. Ann Allergy Asthma Immunol 1996;76:416-8. PubMed
  3. Chevallier A. Encyclopedia of Herbal Medicine. 2nd ed. New York, NY: DK Publ, Inc., 2000.
  4. Ciganda C, and Laborde A. Herbal infusions used for induced abortion. J Toxicol.Clin Toxicol. 2003;41:235-239. PubMed
  5. Futrell, J. M. and Rietschel, R. L. Spice allergy evaluated by results of patch tests. Cutis 1993;52(5):288-290.
  6. Tognolini, M., Barocelli, E., Ballabeni, V., Bruni, R., Bianchi, A., Chiavarini, M., and Impicciatore, M. Comparative screening of plant essential oils: phenylpropanoid moiety as basic core for antiplatelet activity. Life Sci. 2-23-2006;78(13):1419-1432. PubMed
  7. Goun, E., Cunningham, G., Solodnikov, S., Krasnykch, O., and Miles, H. Antithrombin activity of some constituents from Origanum vulgare. Fitoterapia 2002;73(7-8):692-694. PubMed
  8. Lemhadri, A., Zeggwagh, N. A., Maghrani, M., Jouad, H., and Eddouks, M. Anti-hyperglycaemic activity of the aqueous extract of Origanum vulgare growing wild in Tafilalet region. J Ethnopharmacol. 2004;92(2-3):251-256. PubMed
  9. McCue, P., Vattem, D., and Shetty, K. Inhibitory effect of clonal oregano extracts against porcine pancreatic amylase in vitro. Asia Pac.J Clin.Nutr. 2004;13(4):401-408.
  10. Ragi, J., Pappert, A., Rao, B., Havkin-Frenkel, D., and Milgraum, S. Oregano extract ointment for wound healing: a randomized, double-blind, petrolatum-controlled study evaluating efficacy. J.Drugs Dermatol. 2011;10(10):1168-1172.
  11. Singletary K. Oregano: overview of the literature on health benefits. Nutrition Today 2010;45(3):129-38.
  12. Silva MLAE, Lucarini R, Dos Santos FF, et al. Hypoglycemic effect of rosmarinic acid-rich infusion (RosCE) from Origanum vulgare in alloxan-induced diabetic rats. Nat Prod Res 2022;36(17):4525-4531.

See these in context on the Oregano 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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