Synopsis

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

Monoterpenes, such as menthol, eucalyptol (1,8-cineole), and limonene, are aromatic compounds found in essential oils of various plants including eucalyptus, peppermint, and pine. Their use in supporting or treating congestion is primarily supported by scientific evidence, particularly for inhalation therapies. Monoterpenes like menthol and eucalyptol act as mild bronchodilators and have mucolytic properties, helping to loosen mucus and make breathing easier. Clinical studies have shown that inhalation of eucalyptol can improve symptoms in patients with chronic bronchitis and sinusitis by reducing inflammation and promoting mucus clearance (Worth et al., 2000). Menthol, found in many over-the-counter topical rubs and inhalants, produces a sensation of improved airflow by stimulating cold receptors in the nasal passages (Eccles, 2003), although it does not physically reduce nasal resistance. Overall, the evidence base for using monoterpenes to support congestion is moderate, with several well-conducted studies and widespread clinical use, particularly for symptomatic relief of upper respiratory congestion.

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Other ingredients used for Congestion

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