Synopsis

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

Horehound (Marrubium vulgare) has a long history of traditional use for relieving bronchial congestion and cough. It has been employed in European herbal medicine for centuries, often included in cough syrups and lozenges. The primary constituents thought to contribute to its expectorant effects are marrubiin (a bitter diterpene), volatile oils, and flavonoids. Marrubiin is believed to stimulate the secretion of bronchial mucus, thereby aiding in the clearance of phlegm from the respiratory passages.

While anecdotal and traditional records abound, there is limited modern scientific validation for horehound’s efficacy in treating bronchial congestion specifically. A few small studies and laboratory investigations suggest mild expectorant and antispasmodic properties, but robust clinical trials are lacking. The European Medicines Agency (EMA) recognizes horehound as a traditional herbal remedy for the relief of cough associated with cold, acknowledging that its use is based primarily on longstanding tradition rather than conclusive scientific evidence.

In summary, horehound’s use for bronchial congestion is well-rooted in herbal tradition, with some pharmacological rationale and minor supportive studies. However, the overall evidence is weak by contemporary clinical standards, meriting a modest evidence rating.

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More about Congestion (bronchial)

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Nature's Sunshine Sinus Support EF