Cranberry (Vaccinium macrocarpon) is probably most well-known for its use in urinary tract infections. Cranberry works in the system by helping to prevent bacteria from being able to adhere to the walls lining the bladder and ureters. For this reason, it is effective against urinary tract infections and should be used whenever there is a kidney or a bladder infection. Cranberry juice may also be used, but care should be taken to purchase 100% cranberry juice and not a mixture, particularly not one mixed with added sugar as most of them on the market are made.

Cranberries are especially high in vitamin C, and contain anthocyanins, carbohydrates, fiber, and potassium.