The UltraCruz Canine Antioxidant Supplement for Dogs is a selenium, vitamin C and vitamin E formula that supports healthy tissues, organs and cellular health. Hard working dogs such as those involved in herding, agility or any active lifestyle may especially benefit from these tasty chews. Selenium and vitamin E are key antioxidants that work well together to regulate free radicals produced during exercise. Vitamin C supports production of connective tissues like tendons and ligaments, as well as skin, bones and teeth. Pine bark extract is a powerful antioxidant, which may help support a normal inflammatory response.