Public release date: 22-Jan-2008

The Cochrane reviewers analyzed 10 studies including 1,049 participants of all ages who received either cranberry products (juice or cranberry capsules), placebo juice or water for at least one month.

Of the studies evaluated, there was no consistent dosage or concentration of cranberries given to the participants, but according to Jepson, there was a “typical amount” given daily.

“The most common amount recommended is one glass twice a day,” Jepson said. “Trouble is, there is no general rule as to how long you have to drink that much in order for you to prevent one UTI.”

Jepson and her colleague found that cranberry products significantly reduced UTIs over 12 months compared to the placebo/control groups. The cranberry treatment was more effective for women who suffered from recurrent UTIs. For example, in one study, after six months, eight women in the cranberry group had a least one recurring UTI, compared with 19 women in the lactobacillus group and 18 in the control group.