Essential oils are molecularly very complex products, and will have different effects depending on how they are used. The 4 main routes of use are the dermal route, the oral route (ingestion), diffusion and inhalation. Some other ways of use are also possible, but often require more precautions, or consultation with a health professional. Here are some indications on these different ways of using essential oils.

This article was updated on 23/11/2023

Dermal

The cutaneous route is ideal for using essential oils since when applied to the skin, the essential oil passes through the epidermis very quickly and spreads throughout the body. If applied to the thorax for example, the particles act in less than 10 minutes! Uses vary depending on many factors: essential oil, associated risks (irritant, dermocaustic, photosensitizing, etc.), desired action, area of ​​application, users, etc. For example, certain essential oils are very dermocaustic and can be used on the skin provided they are very diluted (e.g. Cinnamon). Others are potentially irritating for sensitive skin, and therefore also require dilution (see below) before use. Finally, some do not pose problems, even pure in localized areas and in the short term (for example Ravintsara). Be careful, if you dilute your essential oil, you will have to wait a little longer before observing the effects. Vegetable oils have much larger particles than essential oils, which will therefore be trapped outside the epidermis. Massage for a long time so that it nevertheless penetrates the skin.

Also note that the area of ​​application is quite simply linked to the action sought. For example, an application along the spine aims to act on the nervous system but also on the immune system. On the thorax, the application targets the respiratory system. Liver, intestine, stomach, the organs are in this case directly targeted, for example in cases of difficult digestion or liver problems. In the case of the solar plexus, we target the autonomic nervous system but also the cardiac system. Concerning the folds of the elbow, inside the wrists, the veins are generally clearly visible there, these uses allow rapid passage of the EOs into the blood circulation, we speak of "aromatic infusion". This is often the case for situations of stress and insomnia; the desired effects must be rapid. So it’s all a question of physiology.

Orally

Oral use is possible for many essential oils, contrary to popular belief. Under the tongue, there is an important irrigation network, allowing rapid passage into the blood system. On the tongue, it will be effective for nasal infections, thanks to absorption through the mucous membrane and the sinuses.

Since essential oils have a strong taste and can be irritating, it is generally best touse a suitable support such as a neutral tablet, a teaspoon of vegetable oil or honey, sugar or a piece of breadcrumbs. It is then recommended to ingest it close to a meal for rapid assimilation.

The oral route should however be used with caution: it is considered the least well tolerated route of use due to the absence of a protective barrier, unlike the cutaneous route for example. That is why the ingestion of essential oil is strongly discouraged for children under 6 years old. For certain essential oils, a doctor's advice is necessary before ingestion: if the effectiveness is maximum this way, so is the toxicity!

In broadcast

There are different ways of diffusing essential oils, more or less effective depending on the diffusion technology used, and above all more or less expensive. The best known is of course the use of a streamer : nebulizers remain the most effective and powerful, to be favored for the therapeutic use of essential oils. Then there are misters, ventilation or gentle heat diffusers.

Other diffusion techniques exist but remain quite artisanal and not very effective:

  • There wet diffusion : put a few drops of essential oil in a bowl of hot water near a radiator.
  • THE room spray: add a few drops of essential oils in a spray bottle containing a base allowing their good dispersion (alcohol, white vinegar, etc.).
  • THE incense burner : this last technique is to be avoided for essential oils. They are placed in a receptacle and heated to more than 40°C by the flame of a candle. This technology induces molecular modification of the essential oil, and risks dispersing harmful molecules into the air.

Inhaled

Inhalation allows absorption of essential oils directly through the respiratory tract in different ways since it can be dry or humid:

  • We hear by dry inhalation, inhalations carried out using a support such as a tissue or an inhaler stick. The advantage of dry inhalation is that it is quick and portable, available everywhere. Simply place a few drops of essential oil on a tissue or the cotton wick of the inhaler and inhale deeply.
  • L’wet inhalation can be done using an electric inhaler, or in a bowl of very hot water. Pour a mixture of water and essential oil into a bowl (about 5 drops in a bowl of water), and inhale with your head covered with a towel (to prevent the vapors from diffusing). The aromatic compounds are transported by water vapor which allows better availability of the molecules present in the essential oil. However, it is important not to inhale the essential oil for more than 10 minutes, and not to use essential oils that irritate the respiratory tract. This method is contraindicated for children, people with asthma or suffering from facial skin irritations.

Less common ways of use

Rectal

The mucosa of this area is very irrigated, which allows rapid effectiveness, comparable to what is observed sublingually. The essential oils arrive at the level of the inferior vena cava and are quickly in contact with the pulmonary alveoli. In addition, by this route, essential oils are not degraded as after passing through the intestine.

The rectum is an irritable area, and essential oils should never be applied pure to this area. They must be administered in suppositories. Some pharmaceutical laboratories or pharmacists are authorized to prepare oils in this way; it is strongly recommended not to rely on artisanal manufacturing.

Vaginally

The vaginal mucosa has the same qualities as the rectal mucosa, very permeable and irrigated. This route is available via vaginal enemas with essential oils, gynecological ovules or gynecological creams.

Before using this approach, it is always necessary to speak with your gynecologist or general practitioner. In addition, it is recommended to have the mixtures prepared by professionals in order to limit the risks and side effects.

How to dilute your essential oil?

  • In vegetable oil : for skin application with minimal risk, this dilution remains the best solution. Vegetable oils are very nourishing for the skin. In addition, they have biochemical properties similar to those of essential oils, allowing very good mixing between them. Vegetable oils can also be used as a support for oral intake. In this case, choose edible vegetable oil.
  • In water : essential oils never mix with water, they are lipophilic and generally remain on the surface of the water. For use in a glass of drinking water, it will be necessary to use a dispersant suitable for ingestion. For use in a bath, for example, you will need to mix the essential oil with a suitable dispersant (foaming base, bath salts, etc.).
  • On a neutral tablet : they can be found in pharmacies or on the internet. They are generally formulated with acacia gum, and are, as their name suggests, neutral in taste. Simply place 1 to 2 drops maximum of the essential oil on the tablet, let it penetrate, then let it melt in the mouth.
  • On a sweet support (honey, sugar, breadcrumbs) : these supports are effective when taken orally, reducing the very strong taste of the essential oil and allowing better digestion.
  • In a cosmetic base (cream, gel, balm, etc.) : all these products allow easy skin application of the essential oil, reducing the risks for the skin. However, each of these blends requires precise dilution of the essential oil. You cannot mix as many drops in a balm as in a cream, for example.

Some vegetable oils for dilution

Jojoba vegetable oil

Jojoba vegetable oil is theneutral oil par excellence. It is in reality a liquid vegetable wax, it is said to be non-greasy thanks to its biochemical composition very close to part of that of human sebum. This particularity makes it very easily absorbable by the epidermis.

Arnica vegetable oil

For purists, it is actually an oily macerate of Arnica, and not vegetable oil. It is essential in case of muscle pain, jerks, and blood circulation problems. St. John's Wort or even Meadowsweet are also useful macerates for these uses.

Sweet almond vegetable oil

For infants and children, this is the vegetable oil to adopt! Very gentle, moisturizing and softening, it instantly regenerates the skin. In addition, it is effective for all skin types, no contraindications for this all-purpose oil.

Nigella vegetable oil

Nigella vegetable oil is essential for many respiratory, immune or even digestive problems. It can be used both cutaneously and orally. Dilution in another vegetable oil is required for the most sensitive skin and digestive systems.

Borage vegetable oil

Borage oil is suitable for women, she is active on the hormonal system in case of menstrual disorders and during menopause. It is also suitable for dermatological and joint problems thanks to its anti-inflammatory properties. It can also be replaced by Evening Primrose.

Rosehip vegetable oil

Rosehip vegetable oil is regenerative for the skin. Used in cosmetology, it is healing, helps blood circulation and treats skin problems. Furthermore, it is a excellent anti-aging, to be combined with essential oils with similar properties.

Apricot kernel vegetable oil

Apricot Kernel vegetable oil is an excellent diluting oil in aromatherapy, especially for massages. She is very soft penetrating. It allows you to benefit from the powerful and deep action of essential oils.

Olive vegetable oil

Olive oil is very useful for taking essential oil orally. It is often recommended to dilute the essential oil in a teaspoon of olive oil. It is an easy oil to have at home. However, it is preferable to favor virgin and ORGANIC olive oil.

Hemp vegetable oil

For taken orally eOs, many edible oils can be useful. Some have the advantage of being rich in omega-3, a fatty acid essential for the proper functioning of the body. This is the case for Hemp, Chia, Perilla, Flax, and Camelina oils.

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Bibliography

Work : de la Charie, T. (2019). Treat yourself with essential oils. Why and how does it work? Editions du Rocher.

About these tips

This aromatherapy article was written by Théophane de la Charie, author of the book “Treat yourself with essential oils”, accompanied by a multidisciplinary team made up of pharmacists, biochemists and agronomists. 

La Compagnie des Sens and its teams do not encourage self-medication. The information and advice provided comes from a reference bibliographic database (books, scientific publications, etc.). They are given for information purposes, or to suggest avenues for reflection: they should in no case replace a diagnosis, consultation or medical follow-up, and cannot engage the liability of the Compagnie des Sens.