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, healthy balance of effective, veterinarian-recommended solutions made with natural, plant-based ingredients, so you never have to choose between what works and what feels good. Brewer's yeast, cellulose, liver powder (defatted), magnesium stearate, natural chicken liver flavor.