Vita Flex Pro E & Selenium is a balanced supplement of vitamin E and selenium for horses. Many soils in the U.S. and Canada are chronically selenium deficient. Selenium is an important trace mineral that acts as an antioxidant in the horses' body. Selenium works synergistically with vitamin E, another important antioxidant, for many body functions . Feedstuffs grown in some regional soils may provide inadequate amounts of selenium in the daily diet. Vita Flex E & Horse Selenium is a premium quality supplement, which can contribute to the correction of nutrient deficiencies by providing balanced levels of Vitamins E & Selenium.