Drinking cranberry juice on a regular basis may help prevent urinary tract infections (UTIs) in some women, according to a new review. This is not new news, as many people are aware of this connection. However, although the cranberry juice likely works, I would not advise using it. The juice has far too much sugar in it; like all fruit juices, it is high in fructose. Instead, I would advise taking one-quarter teaspoon of mannose, the active ingredient in cranberry juice, once or twice a day as a far superior, more effective, and less damaging alternative to cranberry juice for the prevention of chronic UTIs.
Science Daily April 29, 2004