Show your horses (and their bellies!) some love with Purina Outlast Horse Treats! These treats contain the Outlast Gastric Support Supplement that helps support optimal gastric pH. Purina Outlast Gastric Support Supplement has been researched at the Purina Animal Nutrition Center and is a perfect complement to any horse's diet. Your horse will love this great-tasting treat, and you will feel great knowing that you are helping to support their gastric health.