Horse Guard Vitamin E & Organic Selenium 3 mg of Organic Selenium & 5000 IUs Vitamin E in a 2 ounce dose Only the highest quality ingredients Made in Oregon Formulated by Certified Equine Nutritionists Orders placed with Amazon.com are fulfilled directly by the manufacturer Its function as a natural antioxidant Role in resistance to viral infections Reproduction Growth Protects integrity of muscle tissues Involvement in immune response