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Horehound at a Glance
Marrubium vulgare is a gray-green, woolly member of the Lamiaceae family with a famously bitter taste. The flowering aerial parts are used in traditional herbal preparations.
Traditional Use
Horehound is best known in European and North American folk traditions for cough syrups, lozenges and bitter digestive formulas. Traditional use does not prove treatment of bronchitis, asthma or respiratory infection.
Research
Modern human clinical evidence is limited. Marrubiin and other diterpenes have been studied in laboratory settings, but laboratory activity is not the same as clinical effectiveness.
Preparation
Tea, syrup, tincture and old-fashioned horehound candies are common forms. Commercial candy may contain little actual herb, so labels matter.
Safety
Large medicinal amounts may cause digestive upset. Pregnancy is generally avoided because of historical uterine-stimulant concerns and inadequate safety data. People using medicines for blood pressure or glucose should be cautious with concentrated products because interaction evidence is incomplete.
Folklore
Horehound appears in old European protective and household-herb traditions, sometimes associated with clarity and endurance.
Bottom Line
Horehound is a classic bitter and traditional cough herb with limited modern clinical evidence. For educational purposes only.