Antimicrobial Potential of Cranberry Proanthocynin in Urinary Tract Infections: A Literature Review
Abstract
Urinary tract infections (UTIs) are among the most prevalent bacterial infections, particularly affecting women, pregnant individuals, and children, and are often complicated by increasing antimicrobial resistance. This review evaluates the potential role of cranberry (Vaccinium macrocarpon) and its bioactive constituents, primarily A-type proanthocyanidins (PACs), in the prevention and adjunctive management of UTIs. Cranberry PACs exhibit a unique mechanism by inhibiting the adhesion of P-fimbriated Escherichia coli to uroepithelial cells, thereby reducing bacterial colonization. In addition, cranberries possess antimicrobial, antioxidant, and anti-inflammatory properties that further contribute to urinary tract health. Clinical studies show variable but promising results, especially in women with recurrent UTIs, with some trials demonstrating reduced recurrence rates when cranberry juice or extracts were consumed regularly. Pharmacokinetic studies indicate limited oral bioavailability of PACs, but their metabolites are excreted in urine where they exert local effects. Cranberry products are generally safe; however, potential drug interactions, particularly with warfarin, should be considered. This review concludes that cranberry may serve as an effective, non-antibiotic prophylactic option for recurrent UTIs, but standardized dosing, long-term safety, and high-quality clinical evidence remain areas for further research.
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