Research has shown that cranberries have multiple benefits on human health, the benefits range from increased HDL and reduced LDL, and in lab tests it can kill H. pylori bacteria, which can cause stomach cancer and ulcers. In addition, a compound in cranberries prevents plaque formation on teeth, and extracts of chemicals in cranberries also appear to prevent breast cancer cells from multiplying in a test tube. It is possible that it protects body cells against free radicals and oxidation, conditions related to high levels of 'bad' cholesterol in the blood, ulcers, stroke and a wide range of cancers, including stomach cancer breast cancer. It also prevents or treats urinary infections.
Research has so far found that cranberry juice can be used by women as a natural medicine and antibiotic to prevent or treat urinary infections, like cystitis. The juice contains “antibiotic” compounds called proanthocyanidins that annihilate the Escherichia coli bacteria which cause urinary tract infections and it prevents these bacteria from adhering to the mucosal cells which line the urinary tract.