Cranberry for Prevention of Urinary Tract Infections

A 2025 study found that 500mg of whole cranberry fruit powder daily was significantly more effective than placebo at reducing recurrent urinary tract infections in women over 6 months. Cranberries contain proanthocyanidins and flavonoids, which inhibit the ability of Escherichia coli (a common pathogen) to adhere to uroepithelial cells. In large amounts, cranberries may cause stomach upset or other side effects.

Stonehouse W, Benassi-Evans B, Bednarz J, Vincent AD. Whole cranberry fruit powder supplement reduces the incidence of culture-confirmed urinary tract infections in females with a history of recurrent urinary tract infection: A 6-month multicenter, randomized, double-blind, placebo-controlled trial. Am J Clin Nutr. 2025 Apr;121(4):932-941. doi: 10.1016/j.ajcnut.2025.01.022. Epub 2025 Jan 23. PMID: 39863114; PMCID: PMC12002188.