GASTRIX is Veterinary-tested and endorsed. Product of the USA. Exclusive Veterinary Product. GASTRIX helps promote a healthy stomach and digestive system in the horse and is the most cost effective product that promotes a healthy hindgut as well as foregut. Nutritional supplement for horses that contains vitamins, minerals and herbal ingredients. Helps to establish a healthy digestive system and ease symptoms of ulcers and colic. GASTRIX is NOT an antacid (it is itself mildly acidic) and does NOT block HCl production. As such it helps promote healthy digestion. Store at room temperature.