Ultra Cruz Equine Vitamin B-1 (thiamine) is a special formula containing 8, 000 mg of vitamin B-1 per pound. Vitamin B-1 is essential for the metabolism of carbohydrates and important for normal Muscle activity. An increased supply of vitamin B-1, above the minimum nutritional requirement, may help to Calm nervous or excited Horses. Ultra Cruz Horse vitamin B-1 (thiamine) also contains smaller amounts of crude protein, crude fat, crude fiber and calcium to aid in normal growth.