|Contains veterinary strength antacids to soothe and coat the gastrointestinal tract, but in a super-concentrated formula so you need only use one product instead of three. Picked top choice by the Horse Journal in their review of ulcer feed supplements. Contains calcium carbonate, magnesium silicate, methylcellulose, silicone dioxide, kaolin, pectin and more. Feed 1 oz. twice daily with horse's feed.