Equine Microbiome is the organisms (bacteria) in the intestinal tract that affect the lymphatic system in the intestine that controls Immunity and Health in the horse. The healthier the Microbiome is, the Healthier the horse is. Stamina Plus Equine Supplement and Stamina Plus Immune Power Plus have been designed to maintain a healthy Microbiome and as such a Healthy Horse. A healthy Microbiome will assure that your horse has less health issues and less joint problems. Stamina Plus recommends that one of these two supplements are fed daily, too balance the horses physiologic state.