Synopsis

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

Horehound (Marrubium vulgare) has a long history of traditional use as a remedy for respiratory issues, including coughs, bronchitis, and other lung-related ailments. Traditional Western herbal medicine, as well as folk medicine practices in Europe and North America, have employed horehound as an expectorant, believed to help loosen mucus and ease the passage of phlegm from the lungs. The plant is typically prepared as teas, syrups, or lozenges for this purpose. The active constituents thought to be responsible for its effects include marrubiin, a bitter compound, and various volatile oils.

While horehound’s use as a lung remedy is well documented in herbal texts and pharmacopoeias dating back centuries, scientific evidence for its efficacy is limited. Some laboratory studies suggest mild expectorant action and possible anti-inflammatory effects, but high-quality human clinical trials are lacking. Regulatory agencies such as the European Medicines Agency (EMA) recognize horehound’s traditional use for the relief of cough associated with cold, but also note the absence of robust clinical evidence. Overall, horehound’s support for the lungs is primarily based on tradition, with a modest rating due to the limited scientific validation.

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