Invigor?? Prebiotic Digestion Formula The original and the most potent prebiotic digestive aid on the market. Features & Benefits of Invigor: advance prebiotic digestive aid that nourishes beneficial digestive microflora contains yeast cultures and mannanoligosaccharides (MOS) enhances feed efficiency and is great for older horses helps with hay belly reduction and horses prone to diarrhea colic or laminitis Invigor provides several sources and extracts of yeast to create a favorable environment in the cecum for healthy microbial populations. This is especially important for older horses metabolically challenged horses horses prone to colic or diarrhea horses that are exposed to feed changes or simply to enhance feed efficiency. No barn should be without Invigor! View manufacturer and/or label information.