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Current clinical evidence for using cranberry juice to combat urinary tract infections is “unsatisfactory and inconclusive,” according to Raul Raz, director of infectious diseases at the Technion School of Medicine, Haemek Medical Center in Israel.
Not all medical problems require a state-of-the-art solution, and it would be nice to think that products from the supermarket could treat a widespread and uncomfortable ailment. Cranberry juice and related products have been touted as a simple solution for urinary tract infections, but Raz, finds little to support this claim.
Urinary tract infections (UTIs) are a common complaint; between 10 percent and 20 percent of women will suffer a UTI at least once, and one-third of these will experience it recurrently. Some recent studies support the use of cranberry as a preventive, but Raz and his associate faculty member, Hana Edelstein, advise the medical community that "cranberry should no longer be considered as an effective [preventive] for recurrent UTIs.”
Cranberry contains hundreds of compounds, and it has been difficult to determine which might be responsible for any therapeutic effect, hindering its adoption. Raz and Edelstein point to differences in clinical trial design and the lack of standardization for doses and formulation. There is a range of potential side-effects including stomach upsets and weight gain. Cranberry can also interact badly with other medicines such as Warfarin, commonly used to treat heart disease.