Natures Secret Urinary Cleanse and Flush with Cranberry Extract! The urinary system is composed of the kidneys, ureters, bladder and urethra. Urinary Cleanse & Flush is designed with nutrients to support the proper functioning of the urinary system. This formula includes cranberry extract which contains bladder protecting compounds. The antioxidant components in cranberries are also widely known for their health-promoting properties. Urinary Cleanse & Flush provides ingredients such as goldenrod, birch leaf extract and uva ursi which have all traditionally been used to nourish, cleanse and support the urinary system.