Protexin - Supplement for Dogs & Cats - Cystopro Urinary Health - 120CAPSCystoPro 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. CystoPro contains: Proanthocyanidins (Type A PACs)Proanthocyanidins are naturally occurring powerful antioxidants extracted from the North American cranberry. Type A PACs have an anti adhesion affect, this means they help to reduce