In fact, taking the cranberry alter the chemical composition of the urine thus preventing the adhesion of bacteria, in particular Escherichia coli (E. Coli), the walls of the urinary tract. This effect seems to be due to the presence of various substances eg of hippuric acid and proanthocyanidins (condensed tannins) with high molecular weight. Recent clinical studies show that the use of cranberry has the effect of reducing the number of urinary infections by 20% to 50% per year.