This highly concentrated supplement ensures that your horse gets the critical nutrients they need to thrive. In fact, just two ounces a day is all it takes to provide your horse with the vitamins and minerals typically missing from hay. With 3 mg of organic selenium included in each dose, you can rest assured that your horse is getting the best possible care. Plus, our supplement includes 1,000 IU of Vitamin E per dose! This is the perfect professional-grade supplement to help your horse stay healthy and happy.