Vet's Best Urinary Tract Support for cats is specially formulated with Cranberry Fruit, Parsley Leaf and Horsetail Leaf to support your cat?s healthy urinary tract. For over 30 years, Vet?s Best? has offered a powerful and healthy balance of effective, vet-approved solutions made with natural, plant-based ingredients, so you never have to choose between what works and what feels good.