Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Menthol oil, derived from peppermint, is commonly used as a remedy for nasal and sinus congestion. Its use is supported by both tradition and some scientific evidence, though the scientific validation is modest. Menthol does not physically clear blocked sinuses or reduce inflammation but acts as a counterirritant that stimulates cold receptors in the nasal passages. This produces a subjective feeling of increased airflow and easier breathing, even if actual airway resistance is not significantly reduced. Several studies, including randomized controlled trials, have indicated that inhaling menthol vapors can make people feel as though their congestion is alleviated, despite objective measurements showing little change in airflow. For example, a study published in the Journal of Clinical Pharmacology (1988) showed that menthol improved the sensation of nasal patency without measurable improvement in nasal airflow. Menthol is also a common ingredient in over-the-counter topical ointments and inhalants for cold and sinus relief, which supports its widespread traditional use. In summary, while menthol oil provides symptomatic relief by making patients feel less congested, it does not physiologically decongest the sinuses, and the scientific evidence for its efficacy is limited but present.

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