While there may be some truth to the belief that cranberry juice is good for your bladder and urinary tract, the science behind it isn’t 100%.
However, recent studies suggest that some cranberry supplements may help prevent bladder infections. They contain substances called proanthocyanidins that prevent bacteria from sticking to the bladder wall. But since supplements are not regulated by the FDA, the amount of this active ingredient in different brands can
vary widely . Some supplements do not contain enough to be effective. Many experts also believe that cranberry juice does not contain enough of these proanthocyanidins to be helpful in preventing UTIs.