Evidence supporting the use of: Japanese Horseradish
For the health condition: Colds (decongestant)

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Synopsis

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

Japanese Horseradish, commonly known as wasabi (Wasabia japonica), has a traditional reputation in Japanese folk medicine for aiding in the relief of cold symptoms, particularly as a decongestant. The use stems largely from the plant’s pungent, volatile compounds—most notably allyl isothiocyanate—which can produce a sensation of nasal clearing similar to that caused by horseradish and mustard. There is anecdotal and ethnobotanical documentation of wasabi being used for its perceived ability to “open up” nasal passages and promote sinus drainage by causing a temporary irritation of the mucous membranes, leading to increased mucus flow and a sensation of relief from congestion.

However, rigorous scientific studies specifically evaluating wasabi’s efficacy as a decongestant or treatment for colds are lacking. Most available evidence is based on traditional use and the known effects of related plants in the Brassicaceae family. The decongestant effect is primarily attributed to the sharp, vaporous sensation experienced when consuming wasabi, rather than any proven pharmacological action against cold viruses or inflammation. Thus, while there is a basis in traditional practice and a plausible mechanism for symptomatic relief, there is minimal scientific validation, and the evidence supporting its use for colds remains weak and primarily experiential.

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