Assure Guard Equine Gastric Health Supplement Calcium carbonate helps buffer excess acids and stabilize stomachs pH Contains MINITREX Zn - the most bioavailable chelated source of zinc to support cell health, integrity and recovery Contains high doses of our proprietary blend of probiotics, prebiotics, enzymes and Psyllium, as well as digestive enzymes for optimal feed utilizations ASSURE Guardis a granular product available in 45 or 120 day supply ASSURE GUARD can be fed directly to a horse's concentrate or grain ration. One level scoop is 35 grams. Serving is based on 1100 lb. horse; scoop enclosed.