Supports immune system, circulatory functions, and skin health in cats and dogs.recommended for:animals exposed to environmental toxins (car exhaust, second hand smoke, carpet fresheners etc.)Animals that need joint, immune, circulatory, and vascular support.antiox is standardized to yield 95-Percent proanthocyanidins per capsule.proanthocyanidins are a special type of water-soluble bioflavonoids that are potent antioxidants.proanthocyanidins help to normalize the release of histamine from mast cells thereby reducing the adverse effects of histamine.