Equi-Aid Natural Psyllium Fiber Pellets may help reduce the possibility of digestive colic in horses. Made with Psyllium hydrophilic mucilloid, a natural, bulk-forming fiber. Equi-Aid absorbs moisture to soften the stool and add bulk - to keep things moving through your horse's intestinal tract. Ideal for horses that graze on rocky or sandy soil. 10 lbs in a resealable plastic tub.