Description Purina Outlast⢠Gastric Support Supplement is formulated to support gastric health and proper pH. It is estimated that up to 90 percent of active horses experience gastric discomfort, aÂffecting health, attitude and performance. Common activities including stall confinement, exercise, transportation, weaning and few environments such as events and shows are known to cause stress and gastric discomfort. Purina Outlast⢠Gastric Support Supplement was developed by our Ph.D. Equine Nutritionists to support a healthy gastric environment.Outlast⢠supplement contains a unique blend of ingredients that are designed to support gastric balance, giving you and your horse the confidence to perform.Flexible Feeding horses enjoy Outlast⢠supplement top-dressed or fed as a snack before a stressful event.Outlast⢠supplement provides an aÂffordable tool to support your horseâs gastric health.