Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Eucalyptus (Eucalyptus globulus) has a longstanding history of use in traditional medicine, particularly in Australia and other regions where the plant is native. However, its use to support the respiratory system is also supported by scientific evidence. The primary active constituent in eucalyptus is eucalyptol (also known as 1,8-cineole), which has demonstrated mucolytic (mucus-thinning), anti-inflammatory, and bronchodilatory effects in both laboratory and clinical studies. Several randomized controlled trials have found that cineole can improve symptoms in patients with chronic obstructive pulmonary disease (COPD) and asthma, by reducing airway inflammation and easing expectoration of mucus.^[1][2] Eucalyptus oil is also a common ingredient in over-the-counter vapor rubs and inhalants used for temporary relief of cough and congestion during upper respiratory tract infections.

Despite these findings, the overall quality of evidence is moderate, and eucalyptus should be used with caution, as the essential oil can be toxic if ingested in large amounts or applied undiluted to the skin. Nonetheless, the scientific literature supports the traditional use of eucalyptus for mild respiratory complaints, justifying its use as a supportive ingredient for the lungs and respiratory system.
References: [1] Juergens, U. R. et al. (2003). The anti-inflammatory activity of 1.8-cineole (eucalyptol) in bronchial asthma: A double-blind placebo-controlled trial. Respir Med. [2] Worth, H., & Dethlefsen, U. (2012). Patients with asthma benefit from concomitant therapy with cineole: a placebo-controlled, double-blind trial. J Asthma.

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