Our pony was having problems with diarrhea/wet-gas (what a yucky mess!) and, after giving him a tablespoon-and-a-half of this with his horse-feed morning and night, within a week it cleared him right up. I'd also like to put a plug in for the MannaPro company. I called their toll-free number on the bag and everyone I spoke with was exceptionally helpful and wonderful to deal with! It's nice to see a GREAT company selling a GREAT product :)