The UltraCruz Equine Vitamin B-1 Supplements for Horses are a supplement that provides essential vitamin B-1 (thiamine) that helps maintain a healthy nervous system and normal muscle activity in horses. This high-quality vitamin supplement for horses is provided as an easy-to-use, pelleted formula. Ideal for nervous or excited horses, these vitamin B-1 supplements for horses are great for supporting normal emotional balance. Feel good knowing they're manufactured and developed in the USA with globally sourced ingredients. Includes a 2.5 lb. package of supplements.