The Purina Systemiq Probiotic Pellets Horse Digestive Aid represents over a decade of Purina research into the equine microbiome to help horse owners unlock new insights into their health. Looking beyond the usual expectations of what a probiotic can do, the unique probiotic technology in Systemiq supplement has a systemic effect in your horse, helping them to overcome challenges such as exercise or occasional gastrointestinal stress. It’s time to know your probiotic is working as hard as you do.