Eucalyptus

Botanical

What is it

Eucalyptus (most commonly Eucalyptus globulus) is an Australian tree whose leaves yield an essential oil rich in 1,8-cineole (eucalyptol). It is widely used in inhalations, cough drops, and topical preparations for respiratory and muscle complaints.

Evidence for 2 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Acute and chronic rhinosinusitis

Good Evidence

Standardized cineole (Soledum, Myrtol) shows efficacy in RCTs for acute sinusitis and bronchitis vs. placebo.

Muscle/joint pain (topical)

Limited Evidence

Topical preparations provide counter-irritant analgesia; effects are mild and short-lived.

How it works

Eucalyptol has mucolytic, anti-inflammatory, and mild antimicrobial effects. Inhaled eucalyptus oil thins respiratory secretions and improves breathing in upper respiratory infections, supported by clinical trials in chronic rhinosinusitis and bronchitis. Topical preparations provide mild counter-irritant relief for muscle aches.

Dosage

No RDA. Inhalation: a few drops in steaming water; oral cineole capsules at 100-200 mg three times daily have been studied for sinusitis and bronchitis.

When and how to take it

Used as needed for symptoms; oral cineole is typically dosed three times daily.

3 commercial forms

Compare the main delivery options and what they’re best suited for.

Essential oil (inhalation)

Traditional and common.

Steam inhalation for respiratory symptoms.

Cineole oral capsules

Most clinical evidence.

Standardized active.

Topical balm

Used for muscle aches.

Local action; some dermal absorption.

Safety

Topical and inhalation use is generally safe. Internal use of essential oil at high doses can be toxic (CNS depression, seizures), especially in children; even a few mL can be dangerous in toddlers. Standardized cineole oral capsules used in trials have a good safety record.

Who should be cautious

Children: never apply undiluted essential oil to the face; keep oils out of reach. Pregnancy: avoid internal use of concentrated oil. Asthma: limited evidence both for and against; some report bronchospasm.

Interactions

Cineole can induce CYP enzymes in vitro; clinical relevance at typical doses is small.

Frequently asked questions

Can I drink eucalyptus tea?⌄

Brief, dilute leaf tea is generally safe. Avoid ingesting concentrated essential oil.

Is it safe around children?⌄

Topical or inhaled use needs caution. Never apply to a young child's face, and keep oils out of reach to prevent accidental ingestion.

References

Eucalyptus on Wikidata — Wikidata link

Eucalyptus on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Eucalyptus (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.