A natural cranberry & blueberry extract with marshmallow and vitamin C, to help support a healthy urinary tract. For use in cats and dogs who are prone to Struvite crystals and urinary tract infections. Cranberries and blueberries contain a substance called hippuric acid which helps to prevent bacteria from adhering to the bladder wall, which can cause infections. Berry Balance helps to maintain a healthy urinary tract pH, to control Struvite crystal formation. This product should not be used for animals who are prone to Calcium Oxalate crystals, nor should it be used in conjunction with medical or commercial "acidifying" diets. Always consult a veterinarian if you suspect your pet has urinary tract problems.