Sometimes natural cures really do work because when it comes to treating women's urinary tract infections, cranberry juice is a recommended strategy. Not because it's acidic or has a lot of vitamin C. Instead, antioxidants called proanthocyanins are the real medicinal heroes. These tannins prevent bacteria from adhering to the walls of the bladder where they can multiply and cause, or intensify, an infection. This just in: New studies are testing concentrated cranberry extracts and finding they can also help fight UTI's. No word on when these could be available, so stick to berries or juice for now.The right dose: Varies. But drink unsweetened 100% cranberry juice (60 calories per cup) to avoid excess sugar.