Purina® Outlast® Gastric Horse Support Supplement is specially formulated to promote gastric health and maintain proper pH balance in horses. Designed by expert Ph.D. Equine Nutritionists, this supplement addresses the common issue of gastric discomfort, which affects up to 90 percent of active horses. Factors such as stall confinement, exercise, transportation, weaning, and stressful environments like events and shows can contribute to gastric distress, impacting a horse’s health, attitude, and performance. Purina® Outlast® helps support a healthy gastric environment, helping your horse stay comfortable and perform at its .