Armoracia rusticana

Horseradish root contains glucosinolates that release benzyl isothiocyanate, which has antibacterial activity in vitro. There are no randomised controlled trials of horseradish on its own. Every human study is of a fixed combination with nasturtium herb (Tropaeoli majoris herba), sold in Germany as Angocin Anti-Infekt N — including a double-blind placebo-controlled prophylaxis trial in recurrent lower urinary tract infection (Albrecht 2007, n=174) and observational cohort work in sinusitis and bronchitis. Because the clinical effect cannot be separated from the nasturtium component, no standalone therapeutic dose range is defined for horseradish and the ingredient earns no dose credit in scoring. High intakes can irritate the gastrointestinal tract; not recommended in gastric or duodenal ulcer, or for young children.

Limited clinical evidence. Zero RCTs of horseradish alone. All human evidence is for a fixed nasturtium + horseradish combination, so no standalone clinical dose can be claimed.