Speedwell (Veronica officinalis) has a history of traditional use in European herbal medicine for various ailments, including as a remedy for kidney and urinary tract conditions. Folk medicine texts and herbal compendiums from the 16th to 19th centuries describe Speedwell as a mild diuretic and "blood purifier," sometimes recommended for kidney complaints, bladder inflammation, and urinary difficulties. This usage was based on observational and empirical practices rather than controlled scientific studies.

Modern scientific research on Speedwell's efficacy for treating kidney infections is extremely limited. There are no significant clinical trials or pharmacological studies demonstrating that Speedwell possesses antibacterial properties against pathogens commonly responsible for kidney infections, such as Escherichia coli. Most available scientific literature on Speedwell focuses on its antioxidant and anti-inflammatory effects, with some in vitro studies suggesting mild activity, but not specifically in the context of kidney infection.

In summary, the use of Speedwell for kidney infections is primarily justified by traditional herbal practices, without robust scientific validation. Its role has not been substantiated by modern evidence, and it should not be relied upon as a primary treatment for kidney infections, which require prompt medical intervention.