Synopsis

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

Horseradish (Armoracia rusticana) has a long history of traditional use in European herbal medicine, especially for respiratory tract infections and urinary tract infections. Its pungent root contains glucosinolates, which are enzymatically converted into allyl isothiocyanate and other compounds with noted antimicrobial properties in laboratory studies. In folk medicine, horseradish has been consumed fresh, as a condiment, or as a syrup, believed to "clear" the sinuses and fight infections before the widespread use of antibiotics.

While some in vitro (test tube) studies demonstrate that horseradish extracts can inhibit the growth of certain bacteria, such as Escherichia coli and Staphylococcus aureus, clinical evidence in humans is limited. There are a few small studies, often in combination with other herbs like nasturtium, suggesting potential benefit in mild urinary and respiratory tract infections, but these studies are not large or rigorous enough to be conclusive. Regulatory bodies such as the German Commission E have recognized horseradish for traditional use in supporting the treatment of respiratory and urinary infections, but emphasize that it should not replace antibiotics when they are needed.

In summary, the use of horseradish as an alternative or adjunct to antibiotics is primarily supported by tradition and some promising laboratory data, but robust clinical validation is lacking. It may be appropriate for mild infections or as a preventive measure, but it should not be relied upon for serious or established bacterial infections.

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