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How to Use Oil of Oregano Safely: Dosage, Dilution, and Daily Use

Evidence Based

iHerb has strict sourcing guidelines and draws from peer-reviewed studies, academic research institutions, medical journals, and reputable media sites. This badge indicates that a list of studies, resources, and statistics can be found in the references section at the bottom of the page.

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Oil of oregano and oregano essential oil may sound like the same substance, but there are clear differences between them that are important to know.

What is the difference between oil of oregano and oregano essential oil?

Simply put, oil of oregano is a mild extract of oregano leaves and, while more concentrated than oregano seasoning, is still suitable for ingestion. Oregano essential oil is much more concentrated and is only intended for external use, such as aromatherapy.

How do you use oil of oregano safely if you are new to it?

As a first step, always consult with your doctor before adding to or changing your supplement regimen. Other important recommendations include purchasing your supplements from a reputable manufacturer, using the product as intended, and following the suggested use stated on the product label. It’s best to begin slowly to allow your body time to adjust. Generally, oil of oregano should be used only for short-term cycles.

Should oil of oregano be diluted before oral or topical use?

Yes. Oil of oregano is a strong extract and should always be diluted in water or mixed with a carrier oil before consumption.

What dosage instructions should you follow for oil of oregano products?

Always follow the bottle label instructions for any supplement, including oil of oregano. Review any safety precautions of the specific product prior to use.

Is it better to take oil of oregano with food or on an empty stomach?

To avoid mild discomfort, it is recommended that oil of oregano always be taken with a full glass of water and ideally with food to help guard the stomach lining.

How long do people typically use oil of oregano before taking a break?

The duration of supplementing with oil of oregano can vary by individual, but long-term use is not suggested. It is typically recommended to use one to two weeks at a time, followed by a break to protect your gut balance.

Can you use oil of oregano internally, topically, or both?

Oil of oregano can be taken internally under careful consideration of bottle label instructions and any guidance from your doctor. It is also sometimes applied topically for skin benefits, but always remember to dilute before applying a pure oregano oil. 

What are the benefits of taking oregano oil?

Immune health

The active compounds in oregano oil, called thymol and carvacrol, have been linked to potent defense against harmful bacteria by damaging their cellular membranes. Additionally, oregano oil acts as a strong antioxidant, helping to protect the body against free radical damage. Research indicates that this can help support a healthy immune system.

Respiratory health

Oregano oil has been associated with supporting a healthy respiratory system by acting as an expectorant that helps clear the sinuses and lungs. Human trials in this area are promising, but limited.

Digestive function

The immune support delivered by oregano oil’s active compounds may also contribute to gut health and digestive comfort by defending against harmful bacteria and microbes in the GI tract.

Can you take oil of oregano and black seed oil together?

Yes. Black seed oil is sometimes used to help protect the stomach while taking oil of oregano and can help increase absorption, and they can work synergistically to provide increased benefits.

Who should be cautious with oil of oregano because of side effects or interactions?

Oil of oregano should only be used by adults. Those who may be pregnant or nursing, or those over 65, should consult with their doctor first. This is also true for those with certain medical conditions or who take certain prescribed medications.

What should you check on the label before buying an oil of oregano supplement?

Ensure you are buying the supplement from a reputable manufacturer. Look for appropriate dosages, and review the suggested use to take appropriately.

References: 

  1. Levy-Lopez, N. Essential Oils of Oregano: Biological Activity Beyond Their Antimicrobial Properties. Molecules. 2017; 22 (6): 989.  https://www.mdpi.com/1420-3049/22/6/989 
  2. Nurzynska-Wierdak, R., and Walasek-Janusz, M. Chemical Composition, Biological Activity, and Potential Uses of Oregano and Oregano Essential Oil. Pharmaceuticals. 2025; 18 (2): 267. https://www.mdpi.com/1424-8247/18/2/267 
  3. Alavinezhad, A, et al. Possible Therapeutic Effect of Carvacrol on Asthmatic Patients: A Randomized, Double-Blind, Placebo-Controlled, Phase II Clinical Trial. Phytotherapy Research. 2017; 32 (1): 151-159. https://onlinelibrary.wiley.com/doi/10.1002/ptr.5967 

DISCLAIMER: These statements have not been approved by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent disease.