Protexin CystoPro Urinary Supplement for Dogs and CatsProtexin CystoPro Urinary Supplement for Dogs and Cats CystoPro contains an active ingredient derived from cranberries. This active ingredient is a class of antioxidants called Proanthocyanidins (PACs). CystoPro also contains probiotics, prebiotics and N acetyl D glucosamine. Features: Proanthocyanidins (Type A PACs)Proanthocyanidins are naturally occurring powerful antioxidants extracted from the North American cranberry. Type A PACs have an anti