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Dietary supplement

Oil of Oregano Ingredients & Drug Interactions

by Moss Nutrition

Oil of Oregano label
See full label image
Softgel Capsule Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Oct 7, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Oil of Oregano 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

Oil of Oregano is a dietary supplement by Moss Nutrition 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 Oil of Oregano aerial 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 Oil of Oregano by Moss Nutrition

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

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HelloPharmacist Scorecard of Oil of Oregano by Moss 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 Aug 27, 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.

Moss Nutrition's Oil of Oregano is a single-ingredient softgel: oregano aerial extract—the oil and active compounds from the oregano plant's leaves and stems. The capsule itself is made of gelatin, glycerin, purified water, and rice bran oil.

Does it work?

Couldn't assess
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 assessable

This is a single-ingredient Oregano product and its label doesn't state a use — see Oregano's own graded uses on its monograph.

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.

We don't have reliable evidence in our data to rate oregano for acne, bronchitis, asthma, headache, or upper respiratory tract infection. The research to support its use for these conditions isn't established yet, so we can't tell you whether it works for any of them.

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 at typical food amounts is generally well tolerated. When used as a concentrated supplement in larger doses, it's less studied and you should be cautious.

The most common side effect is mild gastrointestinal upset. Topically, it can cause skin irritation in sensitive people.

Rarely, some individuals have had systemic allergic reactions, including serious ones like anaphylaxis—particularly if they're sensitive to plants in the mint family (Lamiaceae). The safety data advises against medicinal or supplement amounts during pregnancy; food amounts are likely fine.

While breastfeeding, stick to normal food amounts; the safety of oregano supplements isn't established, so talk with your doctor or pharmacist before taking this product if you're nursing.

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.

Before taking this product, double-check with your doctor or pharmacist if you're on blood thinners or antiplatelet drugs (like warfarin, aspirin, or clopidogrel)—oregano may increase bleeding risk. Also confirm it with any diabetes medications (insulin, metformin, sulfonylureas, others), since oregano might lower blood sugar too much.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no assessable stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

Oil of oregano might appeal to you if you're interested in herbal support, but the evidence for its effectiveness isn't reliable yet. If you take blood thinners, antiplatelet drugs, or diabetes medications, you need to check with your doctor or pharmacist before adding this—the interactions are real and could affect how your drugs work.

Anyone with a history of allergies to mint-family plants should also clear it first.

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 Feb 25, 2019.

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 Oil of Oregano, straight from the product label.

Brand Moss Nutrition
Barcode (UPC) M087
Net contents 120 Softgel(s)
Market status On market
Date entered into DSLD Feb 25, 2019
DSLD ID 188831
Product type Botanical
Supplement form Softgel Capsule
Dietary claims / uses All Other
Intended target group(s) Adult (18 - 50 Years), Gluten 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 Oil of Oregano by Moss 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 Softgel(s)
Maximum serving Sizes:
1 Softgel(s)
Servings per container
120
UPC/BARCODE
M087
IngredientAmount% DV
Oil of Oregano aerial extract100 mg--

Other ingredients: Rice Bran Oil, Gelatin, Glycerin, purified Water

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: 1 capsule per day or as directed by your healthcare professional.

Precautions

Warning: If taking medication, pregnant or nursing consult a physician before using.

Keep out of reach of children.

Brand IP Statement(s)

M Professional Supplements

FDA Statement of Identity

Dietary Supplement

Formulation

Does not contain gluten.

Storage

Store sealed in a cool, dry place.

General

V0116.3

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

See for yourself

Oil of Oregano by Moss Nutrition label

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

Oil of Oregano 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 Oil of Oregano by Moss Nutrition

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

Serving size1 Softgel(s) Dosage formSoftgel Capsule Servings per container120 Amounts shown are per serving.

Oil of Oregano aerial extract

Interacts with
208 drugs
100 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...

Oil of Oregano aerial extract monograph & interactions

Other (inactive) ingredients: Rice Bran Oil, Gelatin, Glycerin, Purified Water. These complete the product’s ingredient list but are not active constituents.

Interaction report

Oil of Oregano by Moss Nutrition Drug Interactions

Want to check YOUR meds against Oil of Oregano?

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

Oil of Oregano aerial extract 208

Individual Drug Interactions

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

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

Each ingredient & the kinds of drugs it affects

For each ingredient in Oil of Oregano 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.

Oil of Oregano aerial extract2 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
Oil of Oregano aerial extract full monograph & interactions
The maker

Brand information

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

Moss Nutrition

See all Moss Nutrition products
Name
Moss Nutrition Products, Inc.
Street Address
2 Bay Road
City
Hadley
State
MA
ZipCode
01035
Phone Number
(800) 851-5444
Web Address
www.mossnutrition.com
Pharmacist Counseling Corner

Oil of Oregano by Moss Nutrition: Common Questions

Does Oil of Oregano by Moss Nutrition interact with any medications?
Yes. Based on its ingredients, Oil of Oregano 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?
Oil of Oregano 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 this if I'm pregnant or breastfeeding?
The safety data advises against medicinal or supplement amounts during pregnancy, though food amounts of oregano are likely fine. If you're breastfeeding, stick to normal food amounts; the safety of oregano supplements isn't established. Talk with your doctor or pharmacist for personalized advice.
What are the side effects?
Most people tolerate it well, and gastrointestinal upset is the most common side effect. Rarely, sensitive individuals have had serious allergic reactions including anaphylaxis. If you've had allergies to mint-family plants, talk with your pharmacist first.
Does this actually work for colds or respiratory infections?
We don't have reliable evidence in our data to say whether it helps with upper respiratory infections, bronchitis, or asthma. The research to support those uses isn't established yet.
Why is oregano oil stronger than the seasoning I cook with?
This is a concentrated extract—much more potent than the dried oregano you'd sprinkle on food. The supplement version is less studied at higher doses, so concentrated products carry more caution than what you'd get from normal cooking.
Is there anything else in the capsule besides oregano?
Yes—the capsule itself is made of gelatin, glycerin, purified water, and rice bran oil. These are inactive ingredients that hold and deliver the oregano extract.

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

Not sure if Oil of Oregano is safe with your meds?

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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.

Oil of Oregano label
Go deeper

The Full Monographs Behind Oil of Oregano’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

Oil of Oregano'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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