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Can cranberry capsules prevent urinary tract infections?

Based on the current data, it appears that cranberry juice and its derivatives may reduce the number of urinary tract infections by about 33% in women who have them repeatedly. However, the optimal quantity, concentration, and duration for the product to be most effective is not known. Therefore, it is up to individuals to make their own decision. As for renal failure, there is no data suggesting that cranberries should be avoided in this situation.