Mega-Sel is a unique compound of selenium-tocopheryl (Vitamin E) for equine dietary supplementation. Each ounce contains 2.25 mg. of Sodium selenite and 50 IU Vitamin E. The selenium source is greater than 99% pure. The Vitamin E source is 100% biologically available. Mega-Sel should be top-dressed on the horse's daily ration of dry or sweet feed.