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Contraindications of essential oils

Aromas are handy to have on hand daily to take advantage of their natural, chemical-free benefits, but if used incorrectly, they may lead to unexpected encounters.

The precautions differ slightly according to symptoms, situation, use and age, and there are also contraindications.

It is not something to use based on complex special knowledge, but it is useful to know the basic precautions.

Essential oils can ignite

Essential oils can ignite. Each essential oil has a different heat resistance temperature, but it might catch fire.

The flash points of popular essential oils are as follows.



Citrus fruits such as lemon and orange/43-50°C



Roman camomile/58°C







Clary sage/77°C


Those with a low flash point temperature are more volatile, and their fragrance is more easily released, while those with a high flash point temperature are less volatile, and their molecules are heavier.

Conversely, some essential oils solidify at temperatures below 10°C and should be wiped off each time they are used, even at room temperature.

The properties of essential oils are fat-soluble, volatile, flammable, liquid or semi-liquid, light yellow or transparent in colour, so knowing the flash point will help you to use them safely.

Precautions for the safe use of essential oils

The following should be observed When using essential oils.

⭐︎Do not apply the undiluted solution directly to the skin or drink it without diluting it.

⭐︎Should be used to avoid contact with the eyes.

⭐︎Avoid use in the presence of fire, as essential oils are flammable.

⭐︎As it does not like high temperatures and high humidity, close the cap tightly and store it in a cool, dark place.

⭐︎Store out of reach of children and pets.

⭐︎Be careful about the concentration used, where they are applied and the time of day they are used for phototoxic essential oils.

⭐︎ Avoid massage with essential oils in early pregnancy and limit to aromatic baths.

⭐︎In mid to late pregnancy, it is better to stop the dilution concentration to 1%, except for essential oils with strong menstrual effects.

⭐︎For seniors, it is advisable to use half the normal dilution concentration.

⭐︎To avoid overloading the senior individual's body, devise a partial test massage.

⭐︎ For people with pre-existing medical conditions, use at half the normal dilution concentration.

⭐︎Patch test in advance if there are skin allergies, etc.

⭐︎Use only for aromatic baths under 3 years old.

⭐︎Use only low-toxicity essential oils at one-half to one-quarter the concentration adults use for over 3 years old to 10 years old.

: What is aromatic bathing? Aromatic bathing refers to diluting essential oils with water and allowing them to evaporate through candles or other means to enjoy their fragrance in the air.

Essential oils during pregnancy

Although it is possible to massage with essential oils from the time of stability, it is helpful to remember which essential oils you should refrain from using in advance.

Why do you need to know?

That is because some essential oils contain ingredients that regulate hormones, promote childbirth and have a menstrual action.

Conversely, there are also essential oils with menstrual effects that are good to use during childbirth or promote delivery.

Essential oils to avoid during pregnancy

Angelica, ylang-ylang, chamomile-roman, cumin, clary sage, clove, coriander, cypress, cedarwood, cinnamon leaf, jasmine, juniper, spikenard, spearmint, sage, geranium, thyme, nutmeg, basil, palmar Sage, hyssop, cypress, fennel, peppermint, marjoram, myrrh, melissa, yarrow, ravinzara, rose. Rosemary is not recommended for pregnant women due to its high sympathizing, menstruation-promoting, labour-promoting, and uterine tonic effects.

Essential oils to avoid in early pregnancy

Orange, Chamomile German, Sandalwood, Niaouli, Pine, Black Pepper, Benzoin, and Lemongrass is Not recommended for pregnant women due to their high menstruating, pro-menstrual, and uterine tonic effects.

Other symptoms and precautions

Essential oils to avoid during menstruation

Clary sage, cloves, cinnamon leaf, fennel, marjoram and myrrh are not recommended for people with excessive or heavy menstruation, as they have high menstruating, pro-menstrual, and uterotonic effects.

Essential oils people with low blood pressure should avoid

Sedative essential oils, such as ylang-ylang, chamomile Roman, bergamot, marjoram and lavender.

Essential oils people with high blood pressure should avoid

Essential oils with circulatory and adrenaline-promoting properties, such as thyme, peppermint, eucalyptus, and rosemary.

Essential oils people with epilepsy should avoid

Stimulant essential oils such as cedarwood, basil, hyssop, fennel, peppermint, yarrow, eucalyptus and rosemary.

Essential oils people during a fever should avoid

Hyssop, yarrow and rosemary.

Essential oils should not be used in combination with alcohol

clary sage

Should avoid essential oils under 3 years of age

Clove, coriander, ginger, thyme, nutmeg, basil, fennel, peppermint, melissa, yarrow, eucalyptus, lemongrass, rosemary and laurel.

Essential oils that are phototoxic and should be avoided in UV

Citrus fruits such as angelica, orange, cumin, grapefruit, bergamot, mandarin, yuzu, lime and lemon. Citrus essential oils are classified as lactones and coumarins and contain furocoumarins, which can cause blemishes.

Essential oils people with liver disease should avoid

Juniper, black pepper and other peppers have a strong detoxifying effect and are not recommended for people with liver disease.

Essential oils people with uterine cancer and endometriosis should avoid

Fennel acts on female hormones and is active during menopause but is not recommended for people with uterine disorders.

Essential oils people with heart trouble should avoid

Peppermint should not be used by people with weak nervous systems or heart problems due to the content of ketones.

Essential oils people with enlargement of the prostate should avoid

Melissa contains the aldehyde citral (geranial) and should not be used.

Essential oils people with glaucoma should avoid

Melissa contains the aldehyde citral (geranial) and should not be used.

Essential oils that are highly irritating to mucous membranes

Thyme, pine, and lemon are highly irritating and not recommended for sensitive skin, but we recommend using a dilution rate for adding a few fragrances to other essential oils.

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