My vet suspected hind gut ulcers with my horse and recommended AssureGuard and a lower starch feed to prevent recurrence after treatment. She recommended this probiotic because they have scientific studies which prove their probiotic makes it to the hind gut. I was sold and after a round of Omeprazole treatment, my horse has not had any recurring ulcer symptoms! He’s also a picky eater and doesn’t have any issue eating his Assure Guard mixed with grain!