Several studies indicate that cranberry helps prevent UTIs of the bladder and urethra (the tube that drains urine from the bladder), especially for women who have frequent UTIs. In one study of older women, cranberry juice reduced the amount of bacteria in the bladder compared to placebo. Another study showed that younger women with a history of frequent UTIs who took cranberry capsules had fewer UTIs compared to those who took placebo.
However, studies suggest that cranberry does not work once you have a UTI. That is because it helps keep bacteria from attaching to the urinary tract. But it is less effective once the bacteria have already attached. That is why cranberry is better at preventing UTIs than treating them. UTIs should be treated with conventional antibiotics.
Two studies showed that cranberry may also prevent the bacteria Helicobacter pylori (H. pylori) from attaching to stomach walls. H. pylori can cause stomach ulcers. So cranberries may play a role in preventing stomach ulcers. More research is needed to be sure cranberry helps.
Scientists are still studying cranberry for the following conditions. More research is needed.
Cancer: Some test tube and animal studies suggest cranberry may help stop cancer cells from growing.
High cholesterol: One preliminary study found that drinking cranberry juice raised HDL (good) cholesterol levels.
Viruses: Cranberry seems to fight some viruses in test tubes. Studies in people are needed.
Bacterial illnesses: Cranberry has been shown to inhibit common forms of bacteria, such as Escherichia coli (E. coli) and Listeria monocytogenes.
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