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Side Effects of Oregano Oil

Loveleena Rajeev
Oregano oil is a popular choice for many ailments. However, it can lead to the development of side effects which one should be aware of, before using it.
Native to the Mediterranean, the oregano plant, also known as Origanum vulgare is popularly known and used as a warm, balsamic and aromatic herb. This herb is a popular spice in the Greek and the Italian cuisine. This plant comes from the mint family Labiatae. Oil extracted from the oregano plant is known to be full of health benefits. Of all the oil formulas, wild Oregano P73 formula is the most used one, and is an easily available product in the market. Even though it is beneficial for health, a few side effects may appear after its use.

Side Effects

Although it has many health benefits, there have been some reports about oregano oil side effects. Even though the effects may not be life-threatening, they should be well-studied and looked into, before using the oil externally or internally. Some of the possible side effects are mentioned ahead.
  • People who are allergic to thyme, basil, marjoram, mint, etc., may also be allergic to oil of oregano, as they all belong to the same family.
  • It can cause rashes and vomiting when taken internally.
  • It is believed that oregano oil reduces the body's ability to absorb iron.
  • When taken excessively, it can lead to toxicity in the body.

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  • One can have digestive problems if the oil is not well-diluted in a carrier oil.
  • Some may experience a warm, tingling sensation in mouth when taken orally.
  • It may cause a burning sensation around the eyes, mucous membranes, and the genital region.


Oregano oil can be used for several health-related problems, however, it is not fit for everyone. Its use is contraindicated in the conditions mentioned ahead.

1. Allergy

Individuals who are allergic to oil of oregano may develop skin rashes and irritation, and experience vomiting after applying the oil externally or consuming it internally. Such individuals should therefore discontinue its use immediately.

2. Pregnancy

Women require a good amount of iron in the body during pregnancy, and to fulfill this need, iron supplements are prescribed for pregnant women. Oregano oil can interfere with the absorption of iron due to which the basic need of the body is not fulfilled.

3. Anticoagulant Therapy

Individuals taking anticoagulants for treating health problems must avoid oregano oil as it can act as a blood thinner and potentiate the overall anticoagulant activity in the body leading to further complications.

Recommended Dosage

Most side effects occur because of excess use or incorrect dosages of the oil. The oil comes mainly in two forms; capsules and liquid form.
Capsule: If one is consuming capsules, it should not be consumed more than 500 to 600 mg a day.

Liquid: While consuming in a liquid form, always use it with a carrier oil such as olive oil. Start with three to four drops daily, and increase the dosage gradually depending upon the severity of the infection.
According to a recent study, the use of oregano oil can help treat Candida. 0.2 to 0.3 ml a day of a coated supplement of oregano oil is recommended to treat this infection.
Before deciding upon its use, it is best to consult a doctor, not only for its recommendation, but also for ensuring that you consume the right amount. Oregano oil is inexpensive and can be easily found in most drugstores. Always make sure to buy a good quality oil to reduce the chances of developing any side effects.