Peppermint Essential Oil: Dangers and Who Should Avoid It

Talking about the dangers of peppermint essential oil is not excessive: this concentrated product, presented in our reference article peppermint essential oil, carries formal contraindications that a simple mint tea does not.

The most serious risk: young children

High-concentration menthol can trigger, through a reflex acting on the nasal mucosa, a laryngeal spasm with slowed breathing, a risk documented in the pediatric aromatherapy literature. This essential oil is therefore formally contraindicated for children under 6-7 years old, including diffusion in their bedroom or application to their face, even heavily diluted.

What does the research say about documented uses?

A German study by Göbel, Schmidt and Soyka, published in 1994 in Cephalalgia, tested diluted peppermint applied to the forehead of volunteers for tension headaches and reported no notable adverse effect at that specific dilution (see the study on Google Scholar). An Iranian trial by Ahmadi and colleagues, published in 2020 in Evidence-Based Complementary and Alternative Medicine, tested inhalation against post-operative nausea without reporting a serious adverse event (see the study on Google Scholar). Both studies reassure on specific, diluted, supervised adult uses — neither covers children, undiluted use, or unsupervised oral intake.

Pregnancy, breastfeeding and at-risk conditions

This essential oil is contraindicated as a precaution throughout pregnancy and breastfeeding, regardless of the method of application. People with gastroesophageal reflux should also stay cautious: peppermint can relax the relevant sphincter and worsen symptoms, even from concentrated external use. People with epilepsy or asthma should seek medical advice before any use, including diffusion.

Population or situation	Risk	Guidance
Children under 6-7 years old	Laryngeal spasm, breathing difficulty	Formal contraindication
Pregnancy and breastfeeding	Insufficient data	Contraindicated as a precaution
Undiluted skin application	Cold burn, irritation	Always dilute in a carrier oil
Contact with the eyes	Sharp irritation	Rinse with a carrier oil, never water

Precautions

• Never for children under 6-7 years old, including diffusion in their bedroom;
• Never undiluted on the skin: always dilute in a carrier oil;
• Never in the eyes or on mucous membranes;
• Never orally without supervision from a trained aromatherapy professional;
• Pregnancy and breastfeeding: avoid entirely as a precaution.

This essential oil never replaces medical treatment. General guidance appears in our safety and precautions guide.