Researchers treated 42 men with an average age of 63 years who had lower urinary tract symptoms with benign prostatic hyperplasia. They took 1500 mg of dried powdered cranberry or placebo for 6 months. The cranberry treated group experienced improvement in rate of urine flow, average flow, and had lower total PSA levels. See http://www.raysahelian.com/cranberry.html for info.