Cranberries and Blueberries have been proven to contain natural anti-adhesion compounds called PROANTHOCYANIDINS (P.A.C.’s). P.A.C.’s block the adhesion of bacteria on the mucosal walls of the bladder and urinary tract by forming a slippery barrier. Once the P.A.C.’s have done their job and have created the slippery barrier, bacteria are unable to adhere or “stick” to the lining and are washed away in the urine preventing infection. P.A.C.’s also promote a healthy immune response.