9 Reasons to Use Oregano Oil With Caution. The Side Effects!!! (2022)

By Jon Yaneff, CNP- October 26, 2017

Disclaimer: Results are not guaranteed*** and may vary from person to person***.

9 Reasons to Use Oregano Oil With Caution. The Side Effects!!! (1)
Credit: iStock.com/Catalina-Gabriela Molnar

Oregano (Origanum vulgare) is a herb first cultivated in the Mediterranean over 2,500 years ago that has many unique health benefits. However, today we are going talk about oregano oil side effects.

First, let’s take a look at why people use oregano oil…

As a medicinal and culinary herb, oregano is from the mint, or Lamiaceae, family. Medicinal grade oregano is distilled to extract its essential oil, while it takes over 1,000 pounds of oregano to make just one pound of oregano oil. Its unique and pleasant smell is due to pinene, thymol, limonene, ocimene, caryophyllene, and carvacrol.

But, the most predominant healing compound in oregano oil is carvacrol, and researchsupports the antifungal, antibacterial, anti-parasite, antiviral, antibiotic, and antioxidant properties of this incredible oil.

As a result, oil of oregano and carvacrol may be able to fight bacterial infections, fungal infections, viruses, parasites, inflammation, candida, allergies, and even tumors. A 2013 study published in the journal PLoS ONE suggested that oregano exhibits anti-cancer activity, as the researchers concluded that oregano could treat and prevent breast cancer through preventing or slowing its progression.(1)

(Video) 14 Amazing Benefits of Oregano Oil

Oregano Oil Side Effects

Although the health benefits are quite impressive, thereare also oil of oregano side effects you need to know about. Because of its strong potency, the medicinal use of oregano oil should be administered only under the guidance of a naturopathic doctor or natural practitioner.

The following is a detailed description of nine side effects of oregano oil:

1. Upset Stomach

Oregano oil is well known to treat digestive problems, including bloating, abdominal pain, stomach cramping, diarrhea, and intestinal parasites. This is due to the antifungal, antiparasitic, and antiviral properties of oregano oil.

However, this herbal oil is extremely strong, and when taken in large amounts, oil of oregano can cause upset stomach or irritation of the gastrointestinal tract. It is recommended to dilute oregano oil with a carrier oil like jojoba oil before using oil of oregano for any reason.

2. Unsafe for Diabetics

Oil of oregano is also thought to be unsafe for diabetics, since it might lower blood sugar levels. Therefore, people with diabetes should use caution while taking oil of oregano.

In vitro and animal studies suggest that oregano extract may reduce blood glucose levels. Also, medicinal amounts of oregano may have additive effects when used with other supplements and herbs that lower blood sugar levels. This is thought to increase the risk of hypoglycemia in some diabetic patients.

Some herbs and supplements with hypoglycemic effects include Siberian ginseng, psyllium, Panax ginseng, horse chestnut, garlic, fenugreek, devil’s claw, chromium, bitter melon, and alpha-lipoic acid.

(Video) Oil of Oregano is Needed During These Tough Times | Dr. Mandell

3. Inhibits Iron Absorption

Oil of oregano contains tannins that may interfere with iron absorption. Research published in the European Journal of Clinical Nutrition in 1989 confirms that oregano inhibits iron absorption. This was thought to be due the content of galloyl groups in oregano.(2)

Oregano oil can interrupt the regular absorption process and prevent a person’s cells from getting enough iron. If you use oregano oil on a regular basis, it is a good idea to also take an iron supplement. Better yet, consume lots of iron-rich foods like spinach, romaine lettuce, kale, and lentils.

4. Causes Allergic Reaction

Oregano oil may also cause systemic allergic reactions. Research shows that if you are allergic or hypersensitive to plants from the mint family, such as mint, thyme, sage, lavender, hyssop, marjoram, and basil, there is a good chance you will develop a minor to severe allergy to oregano oil as well.

Some of the common allergic reactions to oil of oregano include trouble breathing, itching, irritation, skin rashes, difficulty speaking, vomiting, nausea, and swelling of the tongue, face, and lips.

5. Bleeding Disorder

Oregano oil may also increase the risk of bleeding in people with bleeding disorders. Preliminary evidence suggests that the aristolochic acid isolated from oregano leaves have anti-thrombin, or anti-clotting, activity in in vitro experiments. Reports indicate that oregano oil inhibits arachidonic acid-induced and ADP (adenosine diphosphate)-induced platelet aggregation (clumping of the blood cells). As a result, the use of oil of oregano and other herbs may affect platelet aggregation and increase the risk of bleeding.

Some of these other herbs include ginger, garlic, turmeric, clove, angelica, and red clover. Oregano oil may also enhance the effects and side effects of anti-platelet and anticoagulant drugs, such as heparin, warfarin (“Coumadin”), dalteparin (“Fragmin”), aspirin, clopidogrel (“Plavix”), and enoxaparin (“Lovenox”).

6. Palpitation in the Heart

What are oregano oil side effects on heart and circulatory systems? As a natural mild stimulant, oregano oil temporarily increases heart rate and blood pressure. Those who consume very high doses of oregano oil may notice a sudden increasein their heart rate, which can produce nausea, headaches, chest pain, heavy sweating, and dizziness.

(Video) Oregano Oil Warning

Also, people with clogged arteries or chronic infections that take large doses of oregano oil over several days or weeks may also temporarily experience increased blood flow and strength of heartbeat.

7. Causes Thinning of the Blood

Oregano oil is also considered a natural blood thinner. Therefore, it should be avoided at least two weeks prior to a surgery, or when you are taking any of the anticoagulant drug therapies mentioned above.

Oil of oregano promotes anticoagulation, and this increases the risk of bleeding while also leading to further complications.

8. May Decrease the Absorption of Zinc

The tannins in oil of oregano may also interfere with zinc absorption. So, if you take oregano oil on a regular basis, it is a good idea to take a high-potency multi-vitamin and mineral with lots of zinc.

It is also a good idea to eat lots of zinc-rich foods, especially grass-fed beef, asparagus, pumpkin seeds, sesame seeds, broccoli, and collard greens.

9. Pregnancy Problems

What about oregano oil side effects and pregnancy? In general, is oregano safe in pregnancy? Regular consumption of oregano oil can be dangerous for a growing fetus in the uterus. Pregnant women should avoid oregano oil, since it can stimulate blood circulation and sudden uterine contractions within the womb, and this may weaken the lining of the uterus.

Evidence supports the fact that taking high doses of oregano oil can lead to spontaneous abortion or miscarriage and possible harmful effects in the future mom, such as sudden uterine contractions that can induce vaginal bleeding. Consequently, women in their first trimester of pregnancy should avoid oregano oil consumption.

(Video) 6 Must Know Serious Side Effects Of Oregano Oil

Iron is also important for women during pregnancy. Since oregano oil can interfere with the absorption of iron, the body’s basic need for iron is likely not being met during this time.

Use Oregano Oil with Caution

Oregano oil is a major player in the health industry as a natural antibiotic, antiviral, and antifungalwith many other powerful health benefits. Although the health benefits of oil of oregano are well documented, there are also important oregano oil side effects.

Oregano oil side effects include stomach upset, pregnancy problems, blood thinning, heart palpitations, bleeding disorder, allergies, and possibly reducing blood sugar levels. Oil of oregano may also inhibit iron absorption and lower the absorption of zinc.

High doses of oregano oil are also thought to be intoxicating to the internal system due to the large amount of thymol. This can make the body very toxic; therefore, starting with low doses is always best. Certain ingredients in oregano oil can also destroy pathogens in the body and release toxic substances into the bloodstream. This can produce die-off symptoms that include nausea, headaches, tiredness, and vertigo. However, heavy water consumption can help flush these toxins from your system and prevent the symptoms.

And remember; always use caution while using oil of oregano, and preferably under the guidance of a naturopathic doctor or natural health practitioner.

Also Read:

Are Oregano Oil and Olive Oil Effective Against Toenail Fungus?

(Video) Oregano Essential Oil Benefits, Uses & Side Effects | 9 Impressive Health Benefits of Oregano oil

Oregano Oil: Nature’s Best Antibiotic to Fight Infections

Why You Should Add Oregano Oil to Your Medicine Cabinet

Sources:
“Oregano,” Natural Medicines Comprehensive Database; http://naturaldatabase.therapeuticresearch.com/(X(1)S(wvpspm45p5m5fm3qnxulpz45))/nd/PrintVersion.aspx?id=644&AspxAutoDetectCookieSupport=1, last accessed Oct. 19, 2017.
Benito, M., et al., “Labiatae allergy: systemic reactions due to ingestion of oregano and thyme,” Annals of Allergy, Asthma, and Immunology, May 1996; 76(5): 416-418, doi: 10.1016/S1081-1206(10)63456-4.
Mateljan, G., The World’s Healthiest Foods: Essential Guide for the healthiest way of eating (Seattle: George Mateljan Foundation, 2007), 762, 802.
Perry, D., “Oregano oil side effects,” Tpharm.info, Dec. 17, 2014; http://openmedi.org/oregano_oil_side_effects/1958.html.

FAQs

Are there any side effects to oregano oil? ›

What are the risks of taking oregano and oregano oil?
  • In large doses, oregano oil may be toxic -- and even lethal.
  • Oregano may have diuretic effects.
  • Large amounts of oregano can upset the stomach.
  • Oregano oil may cause rash when applied to the skin.
24 Sept 2021

Who should not take oil of oregano? ›

It is unknown if oil of oregano is safe when used as an oral medicine. Large amounts of oregano may cause stomach upset. Oil of oregano may also cause allergic reactions. Do not use oil of oregano if you are allergic to plants in the Lamiaceae family, such as basil, lavender, sage, and more.

Can Oil of Oregano raise blood pressure? ›

Oil of oregano can cause a range of skin reactions when applied topically, and if used in its undiluted form, it can cause burning and redness even in those with the toughest of skin. When taken internally, it can cause gastrointestinal upset, and those with high blood pressure and heart conditions should avoid it.

What are the benefits of taking oil of oregano daily? ›

A rich source of antioxidants, oil of oregano can help to repair the body's cells and reduce the rate of aging and the risk of some diseases. Oregano contains pyridoxine, also known as vitamin B6, which is necessary for healthy blood vessels and skin.

Does oregano oil affect the brain? ›

Studies show that oregano extracts can help alleviate symptoms of depression and anxiety in humans and animals. Taking carvacrol, a potent medicinal compound found in oregano oil, has been shown to increase levels of dopamine and serotonin in certain parts of the brain, reducing symptoms of anxiety and depression.

Is oregano oil safe to take internally? ›

Share on Pinterest Oregano oil is a diluted oil that is safe to take orally. Oregano, or Origanum vulgare, is a small, bushy plant that belongs to the mint family. It is a familiar culinary herb in Italian dishes. Oregano oil contains high levels of important compounds in its leaves and smaller stems.

When should you not take oregano oil? ›

Remember that essential oils are much stronger than the supplements and should always be diluted. Oregano oils shouldn't be used in babies or children, and pregnant or breastfeeding women. Baser KH. (2008).

Can I take vitamin D with oil of oregano? ›

No interactions were found between oregano and Vitamins.

Is oil of oregano good for your liver? ›

The Science Behind Oregano Oil and Gut Health

Scientific literature reveals that extracts of oregano herb are antimicrobial, antiviral, and liver-protective. They also have analgesic (pain relieving) actions, and anti-inflammatory properties [13 Trusted SourcePubMedGo to source].

Does Oil of Oregano cause blood clots? ›

Oregano might slow blood clotting. Taking oregano along with medications that also slow blood clotting might increase the risk of bruising and bleeding.

How many days should you take oregano oil? ›

Green also cautions against using oregano oil for longer than one week. Take one dose three times a day for the first two days, she suggests. Then use one capsule twice a day. If you get no relief from your symptoms after seven days, discontinue its use and find another remedy.

Does Oil of Oregano cause blood thinning? ›

People should also be aware that oregano oil may increase the effect of blood thinning or anticoagulant medications. Therefore, people who take warfarin, heparin, or other anticoagulant medications must avoid taking oregano oil.

Can oil of oregano be taken long term? ›

As beneficial as it may be for warding of candida—an overgrowth that can cause infection, digestive problems, and leaky gut—it can also negatively kill off good healthy gut bacteria, increasing your chances of having diarrhea. Extended, long-term use of oregano oil is highly discouraged.

Does oil of oregano help against Covid? ›

Essential oils, like oregano

"There have been no essential oil studies with COVID-19 at all," says Dr. Swindells. See what pharmacist Ally Dering-Anderson, PharmD, says about the safety and usefulness of essential oils. The bottom line is that none of these supplements have shown efficacy against COVID-19 yet.

Is oregano oil good for nerves? ›

Oregano Oil

It is is also helpful in quelling anxiety and helping with difficulty sleeping. It induces feelings of inner serenity and calmness so that you are able to relax and fall asleep. For a restful, peaceful sleep, apply a few drops to the soles of your feet at bedtime.

Does oregano boost immune system? ›

Our results indicate that dietary intake of Lamiaceae herbs (oregano and sage) improved innate immune system functions and also reduced the immunosuppresive effects of cyclophopshamide in vivo.

Does oregano oil have zinc? ›

Main ingredients of oregano oil are carvacrol and thymol. Also contains terpens, rosmarinic acid, calcium, magnesium, zinc, iron, potassium, copper, boron, manganese, vitamin A, vitamin C, and vitamin B3.

How many drops of oregano oil should I take daily? ›

Oregano oil uses:

For internal use, take 2 to 4 drops twice daily for up to 10 days. Fight Pneumonia and Bronchitis: For external infections, apply 2 to 3 diluted drops to the affected area. To prevent internal bacterial overgrowth, ingest 2 to 4 drops twice daily for up to 10 days.

What should you not take vitamin D with? ›

Steroids. Taking steroid mediations such as prednisone can reduce calcium absorption and impair your body's processing of vitamin D. Stimulant laxatives. Long-term use of high doses of stimulant laxatives can reduce vitamin D and calcium absorption.

Does oregano oil affect the kidneys? ›

Research has found that oregano has been traditionally used in the treatment of kidney stones. It acts as a diuretic which increases urine volume and reduces supersaturation of crystals and anti-spasmodic agent or relieves pain. Oregano increases the dissolution of kidney stones.

Does oregano clean your blood? ›

Body detox

Enriched with healthy compounds such as calcium, fibre, vitamin K, iron and manganese, oregano can help you detoxify your body as well. Studies show that oregano speeds up liver function and allows proper elimination of toxins from your body.

Is oregano good for kidneys? ›

Oregano- Known for its antibiotic and anti inflammatory properties, Oregano essential oil is great for kidney health and can help with UTIs. Oregano is a VERY spicy oil and should be used with caution when applying topically.

Does oregano increase blood flow? ›

Very useful for bronchopulmonary diseases, it has antiseptic, antibacterial, and antifungal properties. It promotes blood circulation and tissue regeneration.

Does oil of oregano break up mucus? ›

Respiratory conditions: Oregano essential oil can act as an expectorant, which will loosen up or help eliminate the uncomfortable buildups of mucus and phlegm in the respiratory tracts and sinuses, but it is also a soothing balm for inflamed lungs and the throat, which often stimulate coughing fits.

What is the best way to take oregano oil? ›

a small shot of water with one drop of oregano essential oil. It's quick, it's easy and it gets the job done without faffing around. Our personal favourite for days that we feel a cold coming. Make sure it goes directly to your throat.

Does oregano oil affect hormones? ›

Prolonged continual consumption of oregano herb interferes with the action of steroid hormones and several drugs, and effects signaling across the brain–gut axis.

Does oregano have antiviral properties? ›

Essential oils of oregano are widely recognized for their antimicrobial activity, as well as their antiviral and antifungal properties. Nevertheless, recent investigations have demonstrated that these compounds are also potent antioxidant, anti-inflammatory, antidiabetic and cancer suppressor agents.

Can you take turmeric and oil of oregano together? ›

Wild oregano oil (Origanum vulgare) & turmeric oil (Curcuma longa) work synergistically, as they combine their individual, unique methods for combating and treating bacterial, fungal & viral infections.

What essential oils are good for killing viruses? ›

Tea tree. Tea tree essential oil is made from the leaves of Melaleuca alternifolia, a small tree originally found in Australia. Tea tree oil has been found to have antiviral and antimicrobial properties, and may be able to inactivate airborne viruses when applied to an air filter.

Can you take oil of oregano with medications? ›

Medications that slow blood clotting (Anticoagulant / Antiplatelet drugs) interacts with OREGANO. Oregano might slow blood clotting. Taking oregano along with medications that also slow blood clotting might increase the risk of bruising and bleeding.

How many days should you take oregano oil? ›

Green also cautions against using oregano oil for longer than one week. Take one dose three times a day for the first two days, she suggests. Then use one capsule twice a day. If you get no relief from your symptoms after seven days, discontinue its use and find another remedy.

Can oil of oregano be taken long term? ›

As beneficial as it may be for warding of candida—an overgrowth that can cause infection, digestive problems, and leaky gut—it can also negatively kill off good healthy gut bacteria, increasing your chances of having diarrhea. Extended, long-term use of oregano oil is highly discouraged.

Does oil of oregano help against Covid? ›

Essential oils, like oregano

"There have been no essential oil studies with COVID-19 at all," says Dr. Swindells. See what pharmacist Ally Dering-Anderson, PharmD, says about the safety and usefulness of essential oils. The bottom line is that none of these supplements have shown efficacy against COVID-19 yet.

Is oregano good for kidneys? ›

Oregano- Known for its antibiotic and anti inflammatory properties, Oregano essential oil is great for kidney health and can help with UTIs. Oregano is a VERY spicy oil and should be used with caution when applying topically.

Does oregano boost immune system? ›

Our results indicate that dietary intake of Lamiaceae herbs (oregano and sage) improved innate immune system functions and also reduced the immunosuppresive effects of cyclophopshamide in vivo.

Can oregano cure inflammation? ›

Oregano is rich in antioxidants, which can help neutralize free radicals and reduce inflammation ( 15 ). It also contains compounds like carvacrol that have been shown to have anti-inflammatory properties.

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