Type of Study Randomized Double-blind, placebo-controlled, Human Clinical Study
Study Setup Participants: 153 elderly women Duration: Weeks Dosage: 300 ml Cranberry juice
Key findings Use of a 300ml cranberry beverage reduces the frequency of bacteriuria with pyuria in older women. The bacterial adherence to the surfaces in the urea trackt, a prerequisite for the development of most mammalian infections. It was found that Procyanidins (PAC) are responsible for the lower binding effect. 
Authors AVORN J., MONANE M., GURWITZ J.H., GLYNN R.J., CHOODNOVSKIY I., LIPSITZ L. A.
Organisation Harvard University
Full research text Available at http://cel.webofknowledge.com