A balanced intestinal flora is an important part of the digestive tract. Pro- and prebiotics provide digestive support. Bo Yeas Act Ultra provides Mycosorb A+, probiotic yeast to support nutrient absorption. It also contains prebiotics to help the probiotic yeast. It can be given when you notice that the horse's stools look different. In addition, it can also be used to help lower the risk of digestive disorders or during a recovery period after, for example, a course of antibiotics.