VITA FLEX E & SELENIUM by FARNAM options 4 lb - $34.99 4 lb Size 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Please call the store at (434) 392-4192 to place your order. Vita Flex E & Selenium is a balanced supplement of vitamin E and selenium for optimum equine health. Blended with a quality yeast culture base, Vita Flex E & Selenium is palatable and easy to feed.