Thi-a-tone a great source of vitamin B1 to calm your nervous horse. Contains Thiamine Hydrochloride. Horses that are deficient in Thiamine (Vitamin B1) may exhibit extreme nervousness, loss of appetite, or weight loss under stressful situations such as competition, training, or transportation. Thi-A-Tone is available in an appetite friendly cherry-flavored liquid or apple-flavored powder. This product contains 500 mg. (in liquid form) and 1,250 mg. (in powder form) of Thiamine per ounce.