All Natural Dietary Supplement Compare & Save Helps You Maintain a Healthy Urinary Tract Easy-to-Swallow Low-Calorie Capsule Mason Guarantee - Laboratory Tested This product has been manufactured and packaged in strict conformance with industry and government standards. Urinary tract infections are caused by bacteria. Studies have shown that cranberry helps block the attachment of bacteria to the urinary bladder. Take Mason's highly concentrated cranberry supplement to help maintain a healthy urinary tract.