Contraindications for Essential Oils

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Contraindications for Aromatic Herbs

Essential oils contain various aromatic molecules that belong to different aromatic classifications, each possessing its own characteristic actions. Because essential oils are volatile, they act through inhalation; and because they are lipophilic, when diluted with carrier oils and applied to the skin, their aromatic molecules enter the bloodstream and influence both mind and body.

Some aromatic molecules have beneficial effects, while others may have harmful effects for certain individuals. These are generally categorized and expressed as “contraindications” or “precautions.”

For example: “〇〇 essential oil should not be used during pregnancy because it has emmenagogue, abortifacient, or uterine‑contracting properties.”

Depending on specific conditions, diseases, medical histories, plant allergies, or usage environments, essential oils are classified with contraindications and precautions that must be checked. Since aromatherapy is fundamentally based on self‑responsibility, confirming these points is essential.

Common contraindication categories include: pregnancy, breastfeeding, infants and young children, individuals with epilepsy, those sensitive to strong‑stimulating oils, and people with Asteraceae (daisy family) allergies. Direct sunlight within six hours after topical application should also be avoided due to photosensitizing or phototoxic effects.

For herbs, in addition to contraindications and precautions, checking for drug interactions is essential.

《Quick Tips & Important Notes》

※ Aromatherapy and herbal use are based on self‑responsibility.

※ Essential oils (aromatherapy essential oils) are lipophilic. Products labeled “aroma oil” or “water‑soluble” are not true essential oils, so please take care when using them.

※ The essential oils listed below are examples; you do not need to use all of them.

※ For blending, it is recommended to start with one main essential oil and use a total of about three types, which is easier to manage.

※ Always check physical condition, mood, contraindications, and medical history, and use within an appropriate dilution range.

※ Aroma crafts should be made in amounts that can be used once, or stored in a cool, dark place and used within 3–7 days. ※ For treatment oils, a patch test is recommended.

※ After aromatherapy inhalation, ventilate the room. If you feel unwell, stop use. If skin trouble occurs, rinse with plenty of water. ※ For contraindications, please refer to the relevant page on this site.

※ For those who wish to learn more about fragrance, please refer to the relevant page on this site or visit “C Jasmine Ruri Rurijira’s Maou‑jo” (the Japanese site).

List of Contraindications and Precautions | Aroma Essential Oils

Those who fall under the following categories should not use the corresponding essential oils.

Contraindication List for 140 Essential Oils

アロマハーブ資格勉強サポート・ク…

精油とハーブの禁忌リスト｜安全に使うための注意とリンク集妊娠中・子ども・疾患時など使用を避けたい精油・ハーブの一覧。信頼性ある情報とリンク付きで紹介。botanical-study.com

The links above list 140 essential oils in the following format.

■ Pregnancy, Breastfeeding, and Hormones

■ Individuals with a sensitive nervous system (e.g., the elderly), epilepsy, blood pressure issues, etc.

Patients with a weak nervous system or elderly individuals

Atlas cedar　→　https://botanical-study.com/atlas-cedar-quiz/

Arvensis mint　→　https://botanical-study.com/arvensis-mint-quiz/

Patients with epilepsy

Atlas cedar　→　https://botanical-study.com/atlas-cedar-quiz/

Arvensis mint　→　https://botanical-study.com/arvensis-mint-quiz/

People with high blood pressure

Peppermint　→　https://botanical-study.com/peppermint-quiz/

■ Allergy-related

Individuals with an allergic constitution

Inula　→　https://botanical-study.com/inura-quiz/

True Balsam　→　https://botanical-study.com/true-balsam-quiz/

For those with ragweed allergies

German Chamomile　→　https://botanical-study.com/chamomile-german-quiz/

Yarrow　→　https://botanical-study.com/yarrow-quiz/

Individuals with an aspirin allergy

Wintergreen　→　https://botanical-study.com/winter-green-quiz/

■ Age,Skin,Irritation

Infants and toddlers

Atlas cedar　→　https://botanical-study.com/atlas-cedar-quiz/

Arvensis mint　→　https://botanical-study.com/arvensis-mint-quiz/

For those with sensitive skin

Wintergreen　→　https://botanical-study.com/winter-green-quiz/

Winter Savory　→　https://botanical-study.com/winter-sevory-quiz/

Avoid applying the undiluted product (exercise particular caution if you have sensitive skin).

Ajwain　→　https://botanical-study.com/ajowan-quiz/

Oregano　→　https://botanical-study.com/oregano-quiz/

■ Scope of use, application rate, duration of use, and phototoxicity

Use over a wide area

Arvensis mint　→　https://botanical-study.com/arvensis-mint-quiz/

Peppermint　→　https://botanical-study.com/peppermint-quiz/

Use in large quantities

Anise　→　https://botanical-study.com/anise-quiz/

Copaiba　→　https://botanical-study.com/copaiba-quiz/

Long-term use

Sage　→　https://botanical-study.com/sage-quiz/

Celery　→　https://botanical-study.com/celery-quiz/

Due to photosensitizing (phototoxic) effects, avoid direct sunlight for 4 to 5 hours after application.

Angelica (seed)　→　https://botanical-study.com/angelica-seed-quiz/

Angelica (Root)　→　https://botanical-study.com/angelica-root-quiz/

Essential oils that can be used safely

Depending on your physical condition, existing medical conditions, or whether you are taking medication, use may not be safe; please be sure to check the contraindications and precautions.