OptaGest is a complete solution for everyday digestive care and immune support. Contains clinically tested levels of organic prebiotic that serve as an ideal food source for your pet's native strains of beneficial bacteria. Therapeutic levels of essential, plant-based digestive enzymes help break down food for easier, more complete digestion. Fights digestive upsets, like vomitting, diarrhea, constipation, inconsistent stools, gas and hairballs. Pure formula is free of grains, fillers, flavors, preservatives, animal-derived products and artificial ingredients for a pure powder that is powerful, yet gentle on sensitive systems. View AllClose.