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Most people know oregano as a pizza herb, but oregano oil is a different product, and bottles sold under that name range from olive oil drops meant for the mouth to essential oils meant for a diffuser. This guide explains the difference, what to check before you buy, and how five organic oregano oils compare by form, size and certification.Disclaimer: This article is general information, not medical advice. Talk to your doctor or pharmacist before you start a supplement, especially if you are pregnant, nursing, have a medical condition, take medicine or are buying for a child.
Key Specs Compared
Numbers match the reviews below (tap to jump).
| # | Form | Size | Stated certifications | Gluten-free |
|---|---|---|---|---|
| 1 | Concentrated oil drops | 1 Fl Oz | USDA Organic, Non-GMO | Not stated |
| 2 | Oil supplement | 1 Fl Oz | Certified organic (PACS, Ecocert) | Not stated |
| 3 | Essential oil (diffuser, diluted skin use) | 1 Fl Oz | USDA Organic | Not stated |
| 4 | Oil supplement (in olive oil) | 1 Fl Oz | USDA Organic, Non-GMO Project Verified, Kosher | Yes |
| 5 | Oil supplement | 2 Fl Oz | Organic oregano (no seal named), Non-GMO | Yes |
– = not stated by the maker · Specs and certifications as stated by the listing, not tested or verified by us; check the listing before you buy
Oregano oil safety
- Oregano supplements may slow blood clotting, so Cleveland Clinic advises avoiding them before and after surgery.[1]
- Oregano may lower blood sugar and might interact with diabetes medicine. It is not recommended as a supplement if you are pregnant or nursing.[1]
- NCCIH says essential oils are most often inhaled or applied to the skin in diluted form, so dilute an essential oil before it touches skin.[2]
- Plant-derived and organic ingredients can still be toxic, irritating or allergenic.[3]
Three Kinds of Oregano Oil
- Diluted Supplement Drops – Oregano oil in olive oil, sold as a dietary supplement with directions to take a few drops in water or by mouth. Garden of Life, Natural Factors and Joy of the Mountains fall here.
- Concentrated Oil – Undiluted oil standardized to a share of carvacrol, the main compound in oregano oil. The Aromavita bottle states 86 to 90 percent carvacrol, so read its directions before use.
- Essential Oil – Steam-distilled oil for a diffuser or for skin after dilution in a carrier oil. Mayan’s Secret is this type. It is not made as a supplement.[2]
- Regulation – Dietary supplements do not need FDA approval before they are sold, and a product with treatment claims is regulated as a drug.[3][4]
The Oregano Plant
- Greek Oregano – The classic cooking oregano, and a common source for oregano oil.
- Italian Oregano – A hybrid of oregano and sweet marjoram, with a flavor between the two.
- Mexican Oregano – A different plant that is not a true oregano, but it is widely used in cooking.
- Ornamental Oregano – Grown for its flowers, such as hop-flower and Pilgrim oregano, not for the kitchen. For more plant oils, see our organic essential oils guide.
What to Check Before You Buy
- Which Type It Is – Check whether the bottle is a supplement or an essential oil. The label names the intended use.
- Organic Seal – Look for the USDA Organic seal for certified organic oregano.[5] Joy of the Mountains is certified by PACS and Ecocert instead.
- Carvacrol Percentage – Some labels state a carvacrol percentage, from 75 percent to 90 percent here. A higher number means a stronger oil, not a better one.
- Amount Per Serving – Supplement drops show the serving on the Supplement Facts label, such as four or six drops.[4]
- Minerals – Cleveland Clinic notes that tannins in oregano may affect how the body absorbs iron, copper and zinc, so take a mineral supplement at least two hours apart.[1]
What the Research Says
Cleveland Clinic notes that oregano contains carvacrol, thymol, flavonoids and other compounds, that lab work shows antibacterial properties, and that more research is needed to see whether this benefits people.[1] NCCIH says essential oils are used by inhaling them or applying them diluted, and that little rigorous research exists on aromatherapy for conditions such as insomnia.[2] The FDA says a product intended to treat or prevent disease is a drug, even when it comes from a plant.[3]How We Chose These Products
We do not test products. We compare product details: form, amount per container, stated certifications, ingredients and availability.[4][5] Products that are out of stock stay as they are. Brands don’t pay to be included, though we may earn a commission from purchases.Our Organic Oregano Oil Picks
These five organic oregano oils range from 1 fl oz bottles of drops to a 2 fl oz supplement. Four are meant for the mouth with the label directions, and Mayan’s Secret is an essential oil for diffusers and diluted skin use. With every purchase through the links on this page, we may earn a commission, at no extra cost to you.1
Aromavita® Oil of Oregano Drops Undiluted Greek oregano oil drops, 1 oz
Currently unavailable
- Aromavita Oil of Oregano is a 1 fl oz bottle of undiluted Greek oregano oil, standardized to 86 to 90 percent carvacrol.
- It is USDA Organic, vegan and non-GMO, and the oil is grown, extracted and bottled in Greece.
- It is a concentrated oil, so follow the bottle directions and ask a doctor before taking it.
2
Joy of the Mountains® Oregano Oil Wild oregano oil supplement, 1 oz
Currently unavailable
- Joy of the Mountains Oregano Oil is a 1 fl oz bottle made from wild Mediterranean oregano (Origanum vulgare).
- The oil is 75 to 85 percent carvacrol, and it is sold as a dietary supplement.
- It is certified organic by PACS and Ecocert, and it is made in Canada.
3
Mayan's Secret® Organic Oregano Oil Steam-distilled oregano essential oil, 1 oz
Currently unavailable
- Mayan’s Secret Organic Oregano Oil is a 1 fl oz bottle of steam-distilled essential oil, sold undiluted.
- It is USDA Organic, vegan and cruelty-free, in an amber glass bottle.
- It is meant for diffusers, or for skin after dilution in a carrier oil, not for taking by mouth.
4
Garden of Life® Oregano Seasonal Drops Oregano oil in olive oil, 1 oz
Currently unavailable
- Garden of Life Oregano Seasonal Drops are a 1 fl oz bottle of oregano oil in organic extra virgin olive oil.
- The directions are six drops in water, and the formula is alcohol-free with no artificial dyes or fillers.
- It is USDA Organic, Non-GMO Project Verified, vegan, gluten-free and kosher.
5
Natural Factors® Oil of Oregano Steam-distilled oregano oil drops, 2 oz
Currently unavailable
- Natural Factors Oil of Oregano is a 2 fl oz bottle with 375 servings, the largest size on this page.
- The oil is steam distilled to at least 80 percent carvacrol, and the directions are four drops in the mouth or in water.
- It is non-GMO and free of gluten, dairy, soy, sugar and artificial colors, and the label warns of a warm sensation.
Index Table: Organic Oregano Oil
| No. | Product | Image | Features | Brand |
|---|---|---|---|---|
| 1 | Aromavita Oil of Oregano Drops - Undiluted Greek oregano oil drops, 1 oz |  |
| Aromavita |
| 2 | Joy of the Mountains Oregano Oil - Wild oregano oil supplement, 1 oz |  |
| Joy of the Mountains |
| 3 | Mayan's Secret Organic Oregano Oil - Steam-distilled oregano essential oil, 1 oz |  |
| Mayan's Secret |
| 4 | Garden of Life Oregano Seasonal Drops - Oregano oil in olive oil, 1 oz |  |
| Garden of Life |
| 5 | Natural Factors Oil of Oregano - Steam-distilled oregano oil drops, 2 oz |  |
| Natural Factors |
Sources
- Cleveland Clinic. Oregano, Oregano Oil and Oregano Tea: What Are the Benefits?. Accessed October 26, 2026.
- National Center for Complementary and Integrative Health. Aromatherapy. Accessed October 26, 2026.
- U.S. Food and Drug Administration. Aromatherapy. Accessed October 26, 2026.
- NIH Office of Dietary Supplements. Dietary Supplements: What You Need to Know. Accessed October 26, 2026.
- USDA Agricultural Marketing Service. Organic Labeling Standards. Accessed October 26, 2026.
Update History
- Oct 2026: Rewrote the guide text and product notes, replaced the health-benefit and buying sections with three kinds of oregano oil, safety and interaction notes (Cleveland Clinic, NCCIH, FDA), corrected the Aromavita, Mayan’s Secret and Natural Factors details, set the Key Specs to form, size and certification, and updated the sources
- Oct 2026: Removed SVA Oregano Essential Oil, which makes no organic claim; removed the cure claims and the advice to take undiluted oil by mouth
- Aug 2021: First published
