Ingredients (NUTRACEUTICAL GRADE) CRANBERRIES, WILD BLUEBERRIES.CRANBERRY: SOURCED IN THE USA. WILD BLUEBERRY: SOURCED IN CANADA. Cranberries and Blueberries have been proven to contain natural anti bacteria on the mucosal walls of the bladder and urinary tract by forming adhesion compounds called PROANTHOCYANIDINS (P.A.C.s). P.A.C's block the adhesion of 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. P.A.C's also promote a healthy immune response.