Surprising Side Effects of Essential Oils

side effects of essential oils

October 25, 2021 update: The CDC found a deadly bacterium, Burkholderia pseudomallei, which causes the disease melioidosis in a lavender essential oil spray called “Better Homes & Gardens Lavender & Chamomile Essential Oil Infused Aromatherapy Room Spray with Gemstones.” Read more here.

The pandemic has only enhanced an already surging demand for essential oils, according to Fortune Business Insights. Those concentrated liquids, which are fragrant compounds extracted from plants, are thought to treat headaches and anxiety and to even heal wounds. In addition to selling them in their pure form, the oils have a home with cosmetic companies, which add them to washes and lotions. Some health influencers even suggest drinking the oils.

With dozens of popular essential oils on the market, there’s evidence that some of them may indeed help you manage stress and insomnia as well as improve sleep and digestion and enhance skin care. Note, though, that there are also many potential side effects of essential oils, depending on how you use them.

Ways to Use Essential Oils

Doctors suggest that if you try essential oils, it’s best to smell them, using either a diffuser or an accessory, like a necklace made with an absorbent material that contains essential oils. The second-safest option is to rub them on your skin. Even though some advertisers and influencers may suggest drinking or eating them, healthcare professionals warn that you should never ingest the oils because they may have contaminants. Not only can the oils themselves hurt your body, but they are not regulated by the Food and Drug Administration (FDA), which adds a level of protection for the consumer.

Side Effects of Essential Oils on Your Skin

Many oils have antimicrobial effects and may help clear and brighten skin or even heal wounds. However, the oils can also aggravate your skin. Plus, anything you rub on your skin can be absorbed into your body. Doctors in the New England Journal of Medicine reported several cases in which prepubescent boys who used products containing lavender and tea tree oils experienced hormone disruption leading to enlarged breasts.  The chemicals had mimicked estrogen, a hormone that increases during puberty in women. 

Certain oils, especially those isolated from citrus fruits such as grapefruit, lemon and orange, can make your skin more sensitive to the sun, causing serious burns.

Annie Gonzalez, MD, a dermatologist in Miami, told The New York Times that essential oils’ reactions are one of the leading causes of allergic contact dermatitis she sees. The situation has worsened during the pandemic, she said, because people stuck at home during the pandemic are experimenting with essential oils remedies in their spare time.

What you can do:

First, start by diluting an essential oil in coconut oil or another neutral carrier oil, so that what you rub on your skin is less potent than the original oil. Then, apply the mixture to a small patch of skin and leave it alone for two days. This is called a patch test and can alert you if your skin reacts poorly to certain oils. If the patch of skin turns red or develops a rash or hives, you will know not to apply the oil to any other parts of your body.

If you’re using an oil that’s known to react with the sun (such as those derived from  citrus), apply it indoors and at night. Be sure to wash your skin before going outside. 

You can be allergic to any oil, but some are more likely to cause a skin reaction than others. These include:

  • Tea tree
  • Nutmeg
  • Peppermint
  • Lemon verbena
  • Cinnamon
  • Bergamot

Inhale the Scent 

Doctors agree that inhaling through a diffuser or a smelling accessory, is the safest way to use essential oils. Scents are known to evoke especially strong emotions and memories. The scents of some oils can be calming, and many people find certain scents soothing. 

Enjoying essential oils this way does still come with a few risks. First, the vaporized oils can irritate your eyes, nose and throat. While some advertise essential oils as a way to ease asthma symptoms, these chemicals can, in some patients, also trigger asthma attacks. “Essential oils are fine when used in aromatherapy for no longer than 30 minutes, as longer periods can cause the body to stress.” Says Mubashar Rehman, Ph.D., a medical writer at “Also, some people can find the smell of certain oils as an allergy trigger, causing eyesores, sneezes and a runny nose. In those cases, they [people] should avoid those oils entirely.”

What you can do:

Make sure the area in your home or office in which you diffuse oils is well-ventilated and that you don’t expose yourself to the oils for more than 30 minutes at a time.

Drinking or Adding Oils to Foods

“Mixing [essential oils] with food or drinks is not proven [to be safe or have benefits] and may even lead to health problems. Pure essential oils are very potent. Even just a small amount can irritate the throat and even the linings of the stomach.” Says Victoria Swift, MD, at “It can even lead to second-degree burns.”

“The risk of poisoning is so high that the first symptoms can manifest quickly, [in] under 30 minutes.” Explains Rehman, some essential oils, such as eucalyptus and sage, can trigger seizures.

Additionally, because there’s no government regulation of essential oils, there’s no guarantee that what you’re drinking is pure. It may contain dangerous contaminants.

Doses and Dilution

In most cases, you should be diluting essential oils  in a carrier oil before using them. Knowing your dosage and following the guidelines on the bottle are important.

Some guidelines from Essential Oil Safety, a reference book for healthcare professionals, also points out that doses for children are different from those for adults. If you’re planning to use oils on your child’s skin, for example, it recommends the following concentrations based on his or her age.

  • 3 to 24 months: 0.25% to 0.5%
  • 2 to 6 years: 1 to 2%
  • 6 to 15 years: 1.5% to 3%
  • More than 15 years: 2.5% to 5%

Essential Oils May Help Treat These Conditions

There are very few high-powered randomized clinical trials testing the effects of essential oils on specific conditions, but some smaller studies suggest that oils may be able to help relieve stress and reduce inflammation associated with skin and respiratory issues, and ease pain. A few examples are below.

Oils that may reduce stress and anxiety




Oils that may address skin conditions



Oils that may alleviate headaches and pain



Oils that may lessen congestion or improve respiratory issues



Oils that may increase energy or brighten mood



What to Keep in Mind When You Buy Them

In the absence of government regulation, here are signs that can help you determine if you’re getting a high-quality product. Buy products in dark-colored glass containers,  as this protects them from light degradation. The labels should state if the oil is 100% pure and the name of the plant’s part from which the oil was isolated. Unfortunately, there’s no grading or purity standards, when it comes to essential oils.

Some studies have shown that certain oils have antibiotic, antiviral and antifungal effects. If you are diagnosed with an infection, or believe you may have one,  remember to discuss the use of oils with your doctor, as some can interfere with the treatments you are prescribed. Never replace medicines with essential oils without consulting your healthcare provider.

“My family has essential oils at home and my health practitioners do know about them. [The healthcare practitioners] aren’t negative about them,” says Ian Sells.

Rehman adds, “under appropriate usage, essential oils can be safe.” But, because they “do not have 100% proven medical effects, they shouldn’t be used to replace prescription medicine, nor should they be consumed. Even using them topically without medical supervision can cause skin damage or even poisoning.”


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Roots Essential
Roots Essential
7 months ago

Thanks so much for the article. Lots of useful info 🙂

I use Cinnamon Essential Oil almost everyday.It smells amazing. I have turned to them as part of their daily skincare routine.

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