GastroAID Everyday is particularly beneficial for hindgut health due to the unique, powerful prebiotic and two live yeast probiotics. Just like our digestive system, the horse’s gut contains ‘good’ and ‘bad’ bacteria. The balance between these bacteria can be easily disrupted. If the presence of bad bacteria outweighs the good, it can negatively impact your horse’s well-being. An unhealthy gut means an unhappy horse.