Essential Oils and Pregnancy: Which Are Safe and Which to Avoid

The essential oil dilemma during pregnancy

Essential oils are everywhere — in skincare products, diffusers, massage oils, and household cleaners. They are natural, they smell wonderful, and they are often marketed as gentle wellness solutions. But during pregnancy, "natural" does not mean "safe."

Essential oils are highly concentrated plant extracts. A single drop of peppermint oil contains the equivalent of 28 cups of peppermint tea. At these concentrations, some oils contain compounds that can cross the placental barrier, stimulate uterine contractions, or disrupt hormonal balance.

Essential oils to AVOID during pregnancy

High-risk oils (avoid entirely)

These oils have documented risks during pregnancy and should not be used in any form — topical, diffused, or ingested:

Uterotonic oils (may stimulate contractions):

• Clary sage (Salvia sclarea) — contains sclareol, a potent uterotonic
• Rosemary (Rosmarinus officinalis) — can increase blood pressure and stimulate uterus
• Juniper berry (Juniperus communis) — traditional abortifacient
• Thuja (Thuja occidentalis) — contains thujone, a known convulsant
• Pennyroyal (Mentha pulegium) — highly toxic, even in small amounts
• Mugwort/Wormwood (Artemisia absinthium) — contains thujone
• Parsley seed (Petroselinum crispum) — emmenagogue properties

Hormone-disrupting oils:

• Fennel (Foeniculum vulgare) — contains estragole, a phytoestrogen
• Anise/Star anise (Illicium verum) — oestrogenic properties
• Basil (sweet) (Ocimum basilicum) — contains estragole

Neurotoxic oils:

• Camphor (Cinnamomum camphora) — can cause seizures at high doses
• Wintergreen (Gaultheria procumbens) — 98% methyl salicylate (aspirin equivalent)
• Birch (Betula lenta) — high methyl salicylate content

Medium-risk oils (use with extreme caution)

These oils are considered potentially problematic. If you choose to use them, do so only in low dilution (under 1%) and in well-ventilated areas:

• Peppermint — generally safe in the second and third trimester in low amounts; avoid in the first trimester
• Eucalyptus — mild concern for 1,8-cineole content; safe in low concentrations for diffusing
• Tea tree — suspected endocrine disruptor at high concentrations; low-concentration topical use is debated

Essential oils generally considered SAFE during pregnancy

The following oils have no documented adverse effects when used properly (diluted for topical use, moderate diffusion time):

Safe for topical use (properly diluted)

• Lavender (Lavandula angustifolia) — calming, safe at 1-2% dilution
• Chamomile, Roman (Chamaemelum nobile) — soothing, anti-inflammatory
• Ylang ylang (Cananga odorata) — relaxing, safe at low dilution
• Neroli (Citrus aurantium) — calming, safe for pregnancy
• Mandarin/Tangerine (Citrus reticulata) — gentle citrus, safe topically (avoid sun after application)
• Sweet orange (Citrus sinensis) — uplifting, safe at standard dilution
• Frankincense (Boswellia carterii) — calming, considered safe

Safe for diffusion only

• Lemon (Citrus limon) — can help with nausea
• Ginger (Zingiber officinale) — may reduce morning sickness when diffused
• Spearmint (Mentha spicata) — gentler alternative to peppermint

Safe usage guidelines during pregnancy

Topical application

• Always dilute — never apply essential oils neat (undiluted) to skin during pregnancy
• Maximum 1-2% dilution — that is 6-12 drops per 30ml of carrier oil
• Use a carrier oil — jojoba, sweet almond, coconut, or grapeseed oil
• Patch test first — pregnancy increases skin sensitivity
• Avoid the abdomen in the first trimester

Diffusion

• Limit to 30-60 minutes at a time
• Ensure good ventilation — open windows or doors
• Use 3-5 drops maximum in a standard diffuser
• Avoid diffusing around pets — cats especially are sensitive to essential oils

General rules

• Avoid ingesting essential oils — always, but especially during pregnancy
• Skip essential oils in the first trimester if you are cautious — this is the most sensitive period
• Buy from reputable brands — adulterated oils may contain unlisted ingredients
• Check skincare products — many contain essential oils as fragrance; read the INCI list

Essential oils in skincare products

Many "natural" skincare products contain essential oils. Check the INCI list for:

• Names ending in "Oil" preceded by a Latin plant name (e.g., Rosmarinus Officinalis Leaf Oil)
• "Parfum" or "Fragrance" — this can hide essential oil blends
• Specific compounds like Limonene, Linalool, Geraniol — these are fragrance allergens often derived from essential oils

Use our ingredient analyzer to check any product for essential oil content and get safety scores for each ingredient.

Aromatherapy during pregnancy: what the evidence says

For morning sickness

Lemon and ginger essential oils (diffused, not applied to skin) have some clinical evidence supporting their use for pregnancy nausea. A 2014 study published in the Iranian Red Crescent Medical Journal found that inhaling lemon essential oil reduced nausea and vomiting in pregnant women.

For anxiety and sleep

Lavender diffusion has evidence for reducing anxiety during pregnancy. A randomised controlled trial in the Journal of Alternative and Complementary Medicine showed improved sleep quality in pregnant women who used lavender aromatherapy.

For labour

Clary sage and jasmine are sometimes recommended by midwives during active labour (not before) to support contractions. This is a clinical decision that should be made with your care team — never self-administer these oils during pregnancy.

The bottom line

Essential oils are potent bioactive compounds, not harmless fragrances. During pregnancy, stick to the safe list, always dilute for topical use, and avoid high-risk oils entirely. When in doubt, fragrance-free skincare products are the safest choice.

Check any product for essential oil content using our ingredient checker, or browse our ingredient database for safety scores on specific oils.

Disclaimer: This article is for informational and educational purposes only and does not constitute medical advice. Essential oil safety during pregnancy is an evolving field. Always consult your midwife, obstetrician, or healthcare provider before using essential oils during pregnancy.