All Natural Herbs for a Horses Immune Systems For better overall health, your horse or equine may need some immune system support. While you may be giving your horse a healthy diet, they may not be building up the same immunities they would if they were grazing in the wild. Silver Lining Herbs all-natural supplements are designed to help support your horse or equines overall health. With proper diet and natural, herbal supplementation, you could help strengthen your horse and eliminate some health problems. Many equine veterinarians and top professional riders say our supplements are best for keeping their horses strong and healthy, and once you try it, we think you will agree.