PreProbiotics A blend of direct fed microbials important to support healthy digestive processes. Crucial to an animal’s gut are the “friendly bacteria” for mircorbial balance. Prebiotics (Fructooligosaccharides FOS) are added to help increase the nutrients needed for specific bacteria to survive. Digestive enzymes are used to help break down food for proper digestion and absorption. Wonderful to use before and after worming or antibiotic protocols. An average size horse uses 10 grams per day.