What is eucalyptus oil?

Eucalyptus oil is an essential oil extracted from the leaves of eucalyptus trees, primarily Eucalyptus globulus or Eucalyptus radiata. It is widely used for its medicinal properties, including its anti-inflammatory, analgesic, antimicrobial, and decongestant effects.

How does it work for medicinal purposes?

Eucalyptus oil works for medicinal purposes primarily through its main active ingredient, cineole (also known as eucalyptol). Cineole has demonstrated anti-inflammatory, analgesic, antimicrobial, and expectorant properties. When inhaled or applied topically, it can help alleviate respiratory symptoms, relieve pain, reduce inflammation, and act as a disinfectant.

What are the active ingredients that are important for its medicinal properties?

The primary active ingredient in eucalyptus oil is cineole (eucalyptol), which contributes to its medicinal properties.

What forms does it come in?

Eucalyptus oil is available in various forms, including essential oil, ointments, creams, inhalers, and lozenges.

What if I have an imbalance or deficiency?

A deficiency of eucalyptus oil is not a common medical concern. However, if there is an imbalance, it may lead to a lack of its beneficial effects, particularly in managing respiratory conditions and other related symptoms.

When was it first used for medicinal purposes?

Eucalyptus oil has been used for medicinal purposes for centuries, with historical records indicating its use by indigenous Australian populations for treating various ailments.

What does Eucalyptus Oil help with?

Eucalyptus oil is steam-distilled from the leaves of the eucalyptus tree. Indigenous Australians used the leaves long before European herbalists took it up in the 1800s. Its main active part is called eucalyptol, also known as cineole.

The human evidence here is stronger than for most plant oils, but it is not even. Mouth rinses and cineole capsules have been tested in real trials. Other uses rest on lab work or small studies.

• Bleeding gums, plaque and gum disease
  Strong evidence — multiple clinical trials of eucalyptol-containing antiseptic mouth rinse. Eucalyptol is one of four active oils in Listerine-type antiseptic mouth rinses. Several clinical trials found less plaque, less gum swelling and less bleeding with these rinses. Chewing gum forms with eucalyptol were tested too.
  Evidence grade A · Traditional tier T2
• Asthma and COPD symptoms, alongside your inhalers
  Good evidence — clinical trials of oral cineole capsules in mild-to-moderate disease. Clinical studies gave people cineole capsules by mouth. They found fewer flare-ups and better lung function in mild to moderate asthma and COPD. Exact doses and trial sizes are not on file here.
  Evidence grade B · Traditional tier T2
• Long-running sinus trouble and sinus infections
  Good evidence — human studies of enteric-coated cineole capsules taken by mouth. Cineole was studied as an enteric-coated capsule, which is swallowed and opens past the stomach. Studies found less sinus swelling and milder symptoms in long-term sinus trouble. Researchers tie this to thinner mucus, less swelling, and action against the bacteria involved.
  Evidence grade B · Traditional tier T2
• Sore muscles and aching joints
  Early evidence — small human studies of diluted oil rubbed on the skin, no trial sizes on file. Diluted eucalyptus oil was rubbed on the skin of people with knee osteoarthritis. Those studies reported less pain and less swelling. The cool-then-warm feeling on the skin may add to the relief people notice.
  Evidence grade C · Traditional tier T2
• Tension headache
  Early evidence — one small controlled trial of a eucalyptus and peppermint blend. One small controlled trial tested a diluted eucalyptus and peppermint oil blend on the forehead. People reported milder tension headaches. The researchers thought the cooling feel and muscle easing both played a part.
  Evidence grade C · Traditional tier T2
• Chesty cough, colds and bronchitis
  Early evidence — well-documented mucolytic action of eucalyptol, trial sizes not on file. Eucalyptol is known to act as a mucolytic, which means it breaks up thick mucus. That effect comes from drug research on the compound rather than trials on file here. It is an active part of many over-the-counter cold remedies and chest rubs.
  Evidence grade C · Traditional tier T2
• Blocked, stuffy nose
  Early evidence — mechanism research on eucalyptol plus wide use in cold products; no trial sizes on file. Research on eucalyptol shows it loosens mucus and calms swelling in the nasal passages. People often report easier breathing within minutes of steam with a few drops, or a chest rub. Trial sizes for steam inhaling are not on file here.
  Evidence grade C · Traditional tier T2
• Foggy head and poor focus
  Early evidence — small human studies of breathing in the aroma. Human studies had people breathe in eucalyptus aroma. They reported more alertness and less mental tiredness, with slightly better scores on attention tasks. These were small studies, and the sizes are not on file here.
  Evidence grade C · Traditional tier T2
• Minor wounds and skin infections
  Long traditional use · not yet tested in trials — lab work against bacteria only, no human trial on file. In lab tests, eucalyptus oil slowed the growth of common skin bacteria, including Staphylococcus aureus. No human trial on file tested it on wounds or infected skin. So what it does for healing in people is still unknown.
  Evidence grade insufficient · Traditional tier T2

What Eucalyptus Oil has not been shown to do

• It has not been shown to replace a prescribed asthma or COPD inhaler.
• It has not been shown to slow the joint damage of osteoarthritis, only to ease reported pain.
• It has not been shown to improve memory or long-term brain health; the studies looked at short-term alertness.

How to read this:

Grade A means several matching randomised trials in people. B means at least one good trial. C means small, mixed or early human studies. D means the human evidence is weak or clashes. Insufficient means no human study at all. This page reports what studies found. It is not medical advice, and it does not say the oil treats anything. For who should avoid it, see the safety page.

Which conditions and symptoms does it help prevent?

Eucalyptus oil may help prevent respiratory infections and support overall respiratory health when used regularly, particularly in inhalation therapy or as a component of household cleaning products.

Which foods are rich in it?

Eucalyptus oil is primarily obtained from the leaves of eucalyptus trees and is not commonly found in food. However, certain herbal teas or throat lozenges may contain trace amounts of eucalyptus oil.

Which foods are rich in it?

Eucalyptus oil is primarily obtained from the leaves of eucalyptus trees and is not commonly found in food. However, certain herbal teas or throat lozenges may contain trace amounts of eucalyptus oil.

What are possible side effects?

Possible side effects of eucalyptus oil include:

• Skin irritation or allergic reactions
• Respiratory irritation or difficulty breathing (when inhaled in excessive amounts)
• Nausea or gastrointestinal upset (when ingested)
• Headache or dizziness (rare)

What’s the recommended daily dose?

The recommended daily dose of eucalyptus oil varies depending on the form and intended use. For inhalation therapy, a few drops in a diffuser or steam inhalation is typically sufficient. When applied topically, it's recommended to dilute the oil with a carrier oil to avoid skin irritation. For oral use, follow product-specific dosing instructions, and it's advisable not to exceed recommended amounts.

How many days does it take to work?

The onset of action of eucalyptus oil varies depending on the condition being treated and the mode of administration. For respiratory symptoms, relief may be experienced within a few days of regular use.

What time of day is best to take it?

Eucalyptus oil can be used throughout the day as needed. However, inhalation therapy may be particularly beneficial before bedtime to help alleviate congestion and promote restful sleep.

Is it best to take it with or without food?

The mode of administration (topical, inhalation, oral) will determine whether eucalyptus oil should be taken with or without food. When using it orally, follow product-specific instructions, which may recommend taking it with a meal to minimize gastrointestinal upset.