Vital Essentials offers both frozen and freeze-dried green tripe. Green tripe is the raw, unprocessed stomach of a ruminating animal. It can be added to raw or traditional petfood. According to the company, it contains high levels of digestive enzymes, probiotics, essential fatty acids and other nutrients. Vital Essentials offers Frozen Beef Tripe Nibblets, Frozen Beef Tripe Patties and Freeze-Dried Tripe Nibblets.