Purina Outlast Supplement is in and in stock at Lochte Feed! Purina® Outlast® Gastric Support Supplement New Purina Horse 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, a­ffecting health, attitude, and performance. Common activities including stall confinement, exercise, transportation, weaning [...] ...