Synopsis

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

Eucalyptus, particularly in the form of eucalyptus oil (derived from Eucalyptus globulus), is commonly used to support and treat coughs. The primary active component, eucalyptol (also known as 1,8-cineole), has been studied for its expectorant, anti-inflammatory, and mild bronchodilatory effects. Several clinical studies and systematic reviews have suggested that eucalyptus oil can help reduce the frequency and severity of coughs, especially in conditions like bronchitis and upper respiratory tract infections. Eucalyptol is an ingredient in many over-the-counter cough syrups and vapor rubs, supporting its established role in mainstream medicine.

Mechanistically, eucalyptol helps to loosen mucus and facilitate its clearance from the airways, which may relieve cough symptoms. Inhalation of eucalyptus vapors can also provide a soothing effect and may reduce cough reflex sensitivity. The scientific evidence, however, is moderate rather than robust. While some randomized controlled trials and meta-analyses have found benefits, the studies are often small, and results can vary based on formulation and dosage.

Traditionally, eucalyptus has been used for respiratory ailments by indigenous Australian peoples and later in Western herbal medicine. Its scientific validation for cough relief reflects both longstanding use and moderate clinical support. While not a cure for underlying illnesses, eucalyptus oil appears to be a safe and effective symptomatic treatment for mild to moderate cough when used appropriately.

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