100% cranberry juice (Vaccinium macrocarpon). Cranberry is a medicinal plant whose properties are concentrated in the fruit. It contains antioxidant substances called proanthocyanidins (PAC). These substances are part of the cranberry pigments and have antibacterial properties, i.e. they prevent bacterial adhesion that causes urinary tract infections. Cranberry proanthocyanidins are recommended for the prevention of urinary tract infections.