Alternative medicineBy Mayo Clinic staff
There's some indication, though it hasn't been proved, that cranberry juice may have infection-fighting properties and drinking it daily may help prevent urinary tract infections. Studies have shown the greatest effect in women who have frequent UTIs. Studies involving children and older adults have had mixed results.
It's not clear how much cranberry juice you'd need to drink or how often you'd need to drink it to have an effect.
If you enjoy drinking cranberry juice and feel it helps you prevent UTIs, there's little harm in continuing to drink it, but watch the calories. For most people, drinking cranberry juice is safe, but some people report an upset stomach or diarrhea.
However, don't drink cranberry juice if you're taking the blood-thinning medication warfarin, because this may lead to bleeding.
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