Supplemental Vitamin E is recommended in several disease treatment protocols.  Vitamin E is measured in IU(International Units) per day. The suggested feeding rate for nutritional treatment of EPM/Wobblers disease or other severe deficiencies is 10,000IU per day.  For healthy horses in stressful situations or in high training programs the suggested feeding rate is 5,000-10,000IU per day.  Feeding extra vitamin E is beneficial in any diet as it is a good source of antioxidants.