Does cranberry juice prevent or treat urinary tract infection?
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Cranberry juice (200 mL daily to 250 mL 3 times daily) or cranberry concentrate tablets (at least 1:30 parts concentrated juice twice daily) reduce recurrent, symptomatic urinary tract infection (UTI) in women by 12% to 20% (absolute risk reduction [ARR]) compared with placebo (number needed to treat [NNT]=58) (strength of recommendation: A). There is no conclusive evidence that cranberry juice effectively treats UTI (SOR: D).
Journal of Family Practice, 52(2) 2003: 154-155.