Finish Line’s Vitamin E & Selenium contains 20,000 IU’s of Vitamin E per lb. and 18 mg per lb. of Selenium in a powder formulation with our unique apple flavor. Feed one to two level scoops (18 gram to 36 grams) per day for an average 500 kg horse. One scoop provides 1.4 mg Selenium and 625 mg Vitamin E. Available sizes 4 lb, 100 day supply for 1 horse at 18g (0.5 vol. oz.) per day 20 lb, 500 day supply for 1 horse at 18g (0.5 vol. oz.) per day