After testing 10 different equine digestive supplements on 4 different horses with major digestive issues and 4 horses with minor digestive issues over the course of 3 months, we concluded that the champion equine digestive supplement is Farnam Sand Clear Digestive Aid for Horse. Our horses showed signs of being more energetic, mobile, and displaying no or minimal signs of stomach/digestive issues within only a couple days of introducing them to Farnam Sand Clear Digestive Aid for Horse. It’s an amazing supplement and its effects show quite instantly. The Horses with major digestive issues (e.g diarrhea) showed results in a couple weeks, whereas the horses with minor issues (e.g. minor flatulence) showed results in as little as one day (all of our horses were monitored by veterinarians prior to introduction to said supplements.)