As with everything else on the market, there will be people who say yes and no. Probiotics are supplements to the diet that contain potentially beneficial yeasts or bacteria.
Hundreds of beneficial organisms reside in the cecum and large colon of the horse naturally. These bigger sections of the gut provide a place for fermentation to take place, where cellulose and hemi cellulose fibers in roughage such as hay (especially stems and stalks) are broken down into a form of nutrient the horse's body can use.
Read more: Can supplementing with Probiotics improve your horse's digestion? [click]