Japanese horseradish, commonly known as wasabi (Wasabia japonica), has a long history of culinary use, especially as a condiment in Japanese cuisine. Its application for urinary tract infections (UTIs) is primarily rooted in traditional practices rather than well-established scientific validation. In Japanese folk medicine and some traditional herbal systems, wasabi has been valued for its purported antimicrobial properties, which led to its occasional recommendation as a supportive agent for urinary tract health.

There is limited scientific evidence to support wasabi's efficacy in treating or preventing UTIs. Some in vitro studies suggest that certain isothiocyanates present in wasabi possess antibacterial effects, including activity against pathogens commonly implicated in UTIs. However, these findings are preliminary, mostly laboratory-based, and have not been substantiated by controlled clinical trials in humans. The concentrations used in these studies are typically much higher than those achievable through dietary consumption.

In summary, while traditional uses of wasabi for urinary tract health exist, scientific evidence remains minimal, and its use for UTIs should not replace standard medical treatment. At present, wasabi’s role in UTI management is best categorized as traditional and supported by only weak evidence.