Eucalyptus Radiata essential oil is renowned for its effectiveness on all ENT problems: colds, sinusitis, bronchitis, coughs... Mainly composed of 1,8-cineole, or eucalyptol, this molecule gives the essential oil a powerful expectorant and mucolytic activity. Antiviral and immunomodulating, it will help relieve certain winter ailments or stimulate immunity during periods of epidemics. Latin name: Eucalyptus radiata A.Cunn. ex DC. Distilled part: leaves

This article was updated on 23/06/2023

Precautions for use

Very flexible in use, unlike certain other Eucalyptus essential oils, Eucalyptus Radiata (or Radiated) essential oil is relatively well tolerated by everyone, except people with asthma and epilepsy. It should also not be used by pregnant women under 3 months and infants under 3 months. All routes of administration are permitted, however it is preferable to dilute it in diffusion, because it is sensitizing for the respiratory tract, and during cutaneous application because of its irritating nature for the skin.

Authorized users

Adults and Teenagers Adults and Teenagers
Children under 6 years old Children under 6 years old
Pregnant & breastfeeding women Pregnant & breastfeeding women
Pregnant women less than 3 months Pregnant women less than 3 months
Babies under 3 months Babies under 3 months

Possible ways of use

Inhaled Inhaled
Dermal Dermal
Oral route Oral route
In broadcast In broadcast

Risks of use

Irritating to the skin Irritating to the skin

Other precautions

Medical advice
  • People with epilepsy should seek medical advice before any use (epileptogenic risk at high doses).
  • Seek medical advice before use for people with asthma.
Skin application
  • It is preferable to dilute Eucalyptus Radiata essential oil to a maximum of 20% in vegetable oil (1 drop in 4 drops of vegetable oil), to be adapted according to the age and sensitivity of the skin. .
  • Avoid application to the face and torso for children. We will focus on the upper back and the soles of the feet.
Ingestion

The oral route is not recommended for children under 12 years old.

In broadcast

The use of Eucalyptus Radiata essential oil is possible in atmospheric diffusion, preferably diluted to around 30% in other essential oils, to prevent it from being too drying for the respiratory mucous membranes, especially in young children.

Allergenic components

Eucalyptus Radiata essential oil contains few allergenic biochemical components.

  • limonene (≤ 7.00%);

  • citral (geranial + neral) (≤ 2.00%);

  • geraniol (≤ 2.00%);

  • linalool (≤ 1.00%);

  • citronellol (≤ 1.00%)

Note: It is preferable to test the essential oil before using it (two drops in the crook of the elbow for at least 24 hours to check that there is no reaction).

Properties of Eucalyptus Radiata essential oil

Eucalyptus Radiata essential oil is highly concentrated in 1,8-cineole, alpha terpineol and alpha pinene. These different molecules give it the following main properties:

  • expectorant, mucolytic ++++ (α-pinene, 1,8-cineole (eucalyptol)):

    Eucalyptol is capable of stimulating the exocrine glands of the respiratory mucous membranes, making it possible to thin secretions and activate the movement of the cilia of the bronchial epithelium in order to more easily expel obstructions from the respiratory tract. Also drying, alpha-pinene and 1,8-cineole present in Eucalyptus Radiata help limit phlegm. The essential oil is particularly effective on the upper respiratory tract, to decongest blocked noses and facilitate breathing.

  • spasmolytic, bronchodilator ++++ (1,8-cineole (eucalyptol)):

    In vivo studies have shown that eucalyptol has bronchodilator activity, by relaxing the smooth muscles of the airways. Indeed, 1,8-cineole could block the influx of calcium across the membrane (the increase in cytoplasmic calcium is, among other things, the signal that stimulates muscle contraction). This property helps relieve coughs.

  • antiviral +++ (α-terpineol, 1,8-cineole (eucalyptol)):

    The alpha-terpineol and eucalyptol couple has a strong antiviral power on the respiratory sphere, by inhibiting the intracellular replication of the virus. Its action on certain viruses responsible for bronchopulmonary infections has already been demonstrated, such as the infectious bronchitis virus (IBV) or the herpes virus.

  • immunomodulating +++ (terpinen-4-ol):

    Eucalyptus Radiata essential oil is ideal during winter periods to stimulate immunity. It promotes the body's ability to defend itself against attacks, by increasing the phagocytic activity of immune cells such as monocytes or macrophages.

  • antibacterial, respiratory antiseptic +++ (α-pinene, 1,8-cineole (eucalyptol)):

    Eucalyptus Radiata essential oil is an excellent respiratory antiseptic. It will be particularly effective during respiratory infections of bacterial origin since it is active on certain microbial strains such as Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli. When diffused, Eucalyptus Radiata essential oil can be used to purify the ambient air. It is even used for prevention in hospitals, in synergy with other essential oils. In addition, it brings a smell of freshness to the room. 

  • anti-inflammatory ++ (α-pinene, 1,8-cineole (eucalyptol)):

    Eucalyptus Radiata essential oil is capable of inhibiting the production of pro-inflammatory molecules involved in certain respiratory pathologies and mucus hypersecretion, such as leukotriene B4 or interleukin 1-β.

  • antifungal + (α-terpineol, 1,8-cineole (eucalyptol)):

    Eucalyptus Radiata essential oil acts on certain strains of fungi such as Aspergillus tubingensis or Penicillium sp. These studies were carried out with the aim of finding alternatives for the treatment of plants, safe for humans and the environment.

  • analgesic + (1,8-cineole (eucalyptol)):

    Eucalyptol is an activator of TRPM8 (cold sensitive receptor) causing local anesthesia by sensation of cold. It is also an inhibitor of TRPA1, a receptor involved in triggering pain signals and activated by inflammatory mediators. These two associated mechanisms seem really effective in blocking pain induced by inflammation.

But also these secondary properties:

  • anti-oxidant
  • parasiticide
  • skin absorption promoter
  • pediculicide
  • positive

In case of Stuffy nose, Nasopharyngitis, Cold

Efficiency: ++++

Simple use

For adults and adolescents: 

  • In dry inhalation, after washing the nose with sea water, place 2 drops of Eucalyptus Radiata essential oil on a tissue or the cotton wick of an inhaler, to breathe 4 to 6 times a day.
  • Dermal, up to 5 drops of Eucalyptus Radiata essential oil diluted in 5 drops of vegetable oil (dilution up to 50%) applied to the torso and upper back, twice a day.

For children from 3 years old. Through the skin, limit yourself to a 20% dilution (1 drop in 4 drops of vegetable oil), rubbing on the upper back and the soles of the feet.

For babies over 3 months old. Dermal, limit yourself to a 5% dilution via the skin (1 drop in 19 drops of vegetable oil), massage on the upper back and the soles of the feet.

Use in synergy

Reserved for ages 6+. Repeat 2-3 times a day for 5 days. Apply 5 to 10 drops of the mixture to the chest and/or upper back:

  • 20 drops of Eucalyptus Radiata essential oil
  • 10 drops of Wild Mint essential oil
  • 20 drops of Balsam Fir essential oil
  • 50 drops of Nigella vegetable oil

More details or other users: essential oils for colds.

In case of Rhinitis, Sinusitis

Efficiency: ++++

Simple use

From 12 years old. In wet inhalation, place 5 drops of Eucalyptus Radiata essential oil in hot water, then inhale the vapors released, 5 to 10 minutes, 3 times a day maximum.

From 6 years old. In dry inhalation, after washing the nose with sea water, place 2 drops of Eucalyptus Radiata essential oil on a tissue or on the cotton wick of an inhaler, to breathe 4 to 5 times a day.

Use in synergy

Reserved for ages 6+. Repeat 4 times a day for 3 days. Apply 2 drops of this mixture to the forehead:

  • 30 drops of Eucalyptus Radiata essential oil
  • 15 drops of Wild Mint essential oil
  • 20 drops of Black Pepper essential oil
  • 10 drops of Lemon Eucalyptus essential oil
  • 75 drops of Nigella vegetable oil

More details or other users: essential oils against sinusitis.

In case of Pharyngitis, Laryngitis

Efficiency: ++++

Simple use

Reserved for over 12s. Orally, 2 drops of Eucalyptus Radiata mixed with a teaspoon of honey, to swallow or dilute in herbal tea, 4 times a day for 2 days.

Use in synergy

Reserved for ages 6+. Repeat 3 times a day until improvement. Place 1 to 2 drops of the mixture on a neutral tablet to place under the tongue:

  • 20 drops of Lemon essential oil
  • 16 drops of Eucalyptus Radiata essential oil
  • 4 drops of Thyme Linalool essential oil

More details or other users: essential oils against laryngitis.

Against the Fever

Efficiency: ++++

Simple use

From 6 years old. Through the skin, 1 drop of Eucalyptus Radiata essential oil in 9 drops of vegetable oil (10% dilution), massage on the thorax and the arch of the foot, twice a day.

Eucalyptus Radiata is effective in cases of fever if it accompanies an ENT infection. No prolonged use without medical advice. In case of prolonged fever or above 40°C, see a doctor.

Use in synergy

Reserved for those over 6 years old and not recommended for pregnant or breastfeeding women. Repeat 3 times a day until improvement. Rub the body energetically with this mixture:

  • 5 drops of Eucalyptus Radiata essential oil
  • 10 drops of Ravintsara essential oil
  • 2 drops of Peppermint essential oil
  • qsp 5 mL of Macadamia vegetable oil

Source: Couic-Marinier, F., & Touboul, A. (2017). The Living Earth guide to essential oils.

Against the Bronchitis, wet cough

Efficiency: +++

Simple use

From 6 years old :

  • In dry inhalation, 2 drops of Eucalyptus Radiata essential oil on a tissue or the cotton wick of an inhaler stick, inhale 4 to 6 times a day.
  • Through the skin, 1 drop of Eucalyptus Radiata essential oil in 4 drops of vegetable oil (20% dilution). As a massage on the thorax and upper back, 3 times a day until improvement (without exceeding 5 days).

For ages 3+. Through the skin, limit yourself to a 10% dilution (1 drop of essential oil in 9 drops of vegetable oil), on the upper back and the soles of the feet.

For babies over 3 months old. Dermal, limit yourself to a 5% dilution (1 drop of essential oil in 19 drops of vegetable oil), on the upper back and the soles of the feet.

Use in synergy

From 3 years old. Repeat 4 times a day for 5 days. Apply 3 drops of the mixture to the chest and 3 drops to the upper back:

  • 20 drops of Green Myrtle essential oil
  • 30 drops of Niaouli essential oil
  • 20 drops of Eucalyptus Radiata essential oil
  • 70 drops (3.5 mL) of Nigella vegetable oil

More details or other users: essential oils for wet coughs.

Eucalyptus Radiata or Eucalyptus Globulus?

Eucalyptus Radiata essential oil is generally recommended in cases of upper respiratory tract infections. L'Eucalyptus Globulus is the essential oil for the bronchopulmonary area par excellence: from 6 years old, 1 drop in 4 drops of vegetable oil, to apply to the upper back and thorax 4 times a day for 5 to 7 days.

In prevention of a Flu, ENT infection

Efficiency: +++

Simple use

From 3 years old. Through the skin, 1 drop of Eucalyptus Radiata in 9 drops of vegetable oil massage along the spine and on the inside of the wrists or the soles of the feet.

From 3 months. In broadcast, dilute Eucalyptus Radiata to 30% in another essential oil (Lemon or Grapefruit for example) and diffuse for a maximum of 30 minutes, according to the diffuser's instructions, in the absence of the child. 

Use in synergy

From 6 years old. When diffusing, add a few drops of the following mixture to the diffuser, according to the instructions, then diffuse in a room for 10 minutes in the morning and evening for 5 days of the week, repeat if necessary.

  • 5 drops of Eucalyptus Radiata essential oil
  • 5 drops of Lemon essential oil
  • 5 drops of Ravintsara essential oil
  • 3 drops of Niaouli essential oil

Source: Couic-Marinier, F., & Touboul, A. (2017). The Living Earth guide to essential oils.

Eucalyptus Radiata or Ravintsara?

The immunomodulating properties of Eucalyptus Radiata are very interesting in preventing flu or ENT infections, but the essential oil of Ravintsara is more suitable: 3 drops along the spine, in the lower back and on the thorax, 1 to 2 times a day.

In case of' Otitis

Efficiency: +++

Simple use

From 6 years old. Dermal, 1 drop of Eucalyptus Radiata essential oil in 4 drops of vegetable oil (20% dilution). Apply by massage around the affected ear (not in the ear!), 3 times a day until improvement.

For children over 3 years old. Through the skin, 1 drop of Eucalyptus Radiata essential oil in 9 drops of vegetable oil (10% dilution). Massage around (never inside) the affected ear, 3 times a day until improvement.

Use in synergy

From 3 years old. Repeat 4-5 times a day for 5 days. Place 3 to 4 drops of the following mixture around the ears:

  • 30 drops of Lemon Eucalyptus essential oil
  • 10 drops of Thyme essential oil with Linalool
  • 10 drops of Eucalyptus Radiata essential oil
  • 10 drops of Fine Lavender essential oil
  • 160 drops (8 mL) of Argan vegetable oil

More details or other users: essential oils against otitis.

Eucalyptus Radiata or Lavandula Stoechas?

Eucalyptus Radiata has properties to relieve otitis, but it is especially recommended during respiratory infections. In case of otitis, but only in adults, favor the essential oil of Lavandula Stoechas : apply 1 drop in 4 drops of vegetable oil around the ear, 5 to 6 times a day for 5 days.

Other famous applications of Eucalyptus Radiata

Eucalyptus Radiata essential oil is used on many occasions, particularly linked to its expectorant, mucolytic, antiviral, anti-inflammatory and immunostimulating properties. For the majority ofthe following uses it will be effective, but without necessarily being the best essential oil. We therefore indicate to you the best replacement for Eucalyptus Radiata for the following different problems.

Asthenia, Fatigue

Although Eucalyptus Radiata essential oil tones slightly, theblack Spruce essential oil is more effective in combating asthenia and fatigue: 1 drop in 4 drops of vegetable oil to apply to the lower back, 3 times a day.

Acne

Eucalyptus Radiata effective, but... it is better to use tea Tree essential oil : cutaneously, 1 pure drop on each pimple, or diluted in a vegetable oil, morning and evening after washing the face, until improvement. Take a week's break after 3 weeks of use.

Angina, Sore throat

Eucalyptus Radiata effective, but... it is better to usetea Tree essential oil, renowned for its powerful anti-infectious properties: orally, 2 drops of Tea Tree mixed with honey, 3 times a day, until improvement (3 weeks maximum).

Gynecological infection

Eucalyptus Radiata can be effective, but... it is better to use thetea Tree essential oil : through the skin, apply 2 drops in 8 drops of vegetable oil on the lower part, twice a day.

Bug spray

Eucalyptus Radiata essential oil is useful against lice when mixed with other essential oils. L'lavandin Super essential oil is more suitable for use alone: ​​1 drop of essential oil in 4 drops of vegetable oil applied to the scalp.

How to recognize a good Eucalyptus Radiata essential oil?

Botanical characteristics
  • Latin Name: Eucalyptus radiata Sieber
  • Botanical family: Myrtaceae
  • Part used: leaves
  • Country of origin: Australia.
Physical characteristics
  • Density at 20°C: 0.905 to 0.925
  • Refractive index at 20°C: 1.455 to 1.475
  • Rotary power at 20°C: -5 to 10
  • Flash point: 51
Organoleptic characteristics
  • Appearance: liquid
  • Color: colorless to pale yellow
  • Odor: fresh, eucalyptol, minty.
Biochemical characteristics
  • limonene: ≤ 8%
  • 1,8-cineole (eucalyptol): 60 to 80%
  • α-pinene: ≤ 5%
  • α-terpineol: 4 to 14%
  • terpenyl acetate: ≤ 2%

Eucalyptus Radiata: from plant to essential oil

The secret of the aborigines

This large tree native to Australia provides bright green leaves. The gray bark can sometimes turn blue depending on the soil and sunlight. If on average its size is around fifty meters high, it can reach up to 120 meters high. The aborigines climbed to the top of the trees to obtain the leaves closest to the sun, and therefore potentially, those which received the most “positive waves”. The aborigines also picked oil glands, small brown fruits growing in cone-shaped clusters. Their seeds were crushed then mixed with water to form a paste which was placed on the patient's head to reduce the fever. One of their old customs was to burn leaves in a sick person's room to purify the surrounding air. The pale yellow flowers were also appreciated for nectar.

To clean their water, early Australian inhabitants floated a small piece of wood in a jar to kill small insects and purify their water supplies. Finally, they also used it as a pump: by placing the end of a root in a pond, and the other in a container, the root pumped the water from one side to fill the container without effort. !

From the Koala tree to toothpaste

This traditional Aboriginal remedy was acclaimed upon its arrival in Europe. It was nicknamed “the koala tree”. Well acclimatized in hot countries, notably in South America and Australia, it was brought to Europe in the 18th century. It now flourishes around the Mediterranean basin. Absorbing a lot of water, it quickly dries up the marshes around it. It is therefore very popular for destroying the humid environments favored by mosquitoes, which carry, among other things, malaria.

Eucalyptus Radiata essential oil began to be marketed in 1860. Today, the main producing countries are, of course, Australia but also South Africa, Spain, Morocco and Thailand. It was initially used to disinfect instruments in English hospitals. From now on, it can be part of the manufacture of mouthwashes and certain toothpastes.

At the heart of the eucalyptus radiata harvest

The leaves of Eucalyptus Radiata are harvested between October and January. You have to wait until they are creamy yellow in color, a sign that they are very ripe.

About 10 cm long, these long, thin leaves give off a pleasant and slightly spicy peppery odor. They are picked by hand to choose only good quality leaves. For optimal quality, the harvest is carried out in dry weather so that the leaves are well open. As with each plantation, the quality varies from one year to the next depending on the richness of the soil, rainfall and sunshine.

The different essential oils of Eucalyptus

Eucalyptus Radiata, Lemon Eucalyptus, Eucalyptus Globulus or Eucalyptus Smithii? Which essential oil for which use?

Although they belong to the same genus, these 4 species are very different and their essential oils are therefore not the same. For more information, discover how to differentiate Eucalyptus essential oils.

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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.