Inulin is a dietary fiber that may benefit gut health. Plants naturally contain inulin, and some manufacturers add it to processed foods. It is present in a large range of fruits, grains and vegetables, such as wheat, onions and bananas. Commercially inulin is sourced primarily from Jerusalem. Inulin is a natural storage carbohydrate present in more than 36, species of plants, including agave, wheat, onion, bananas, garlic, asparagus, Jerusalem.