Santa Cruz Animal Health carries a premium line of equine immune and respiratory system support products formulated to help horses adapt to stressful situations and maintain a healthy immune system. High quality products such as APF provide protection against stress-induced gastric ulcers and allow horses to increase muscle mass in response to exercise in addition to maintaining a healthy immune system. Help your horse manage chronic inflammation with Duralactin® Equine. Give your foal an immune system boost with Foal Response™ Colostrum Paste Supplement. Choose Santa Cruz Animal Health for all of your equine immune system needs.