Inulin is a starchy substance found in many fruits, vegetables and herbs. It is a soluble fiber and fructo-oligosaccharide (FOS) that functions as a prebiotic to promote digestive health. Interestingly, inulin is not digested or absorbed in the stomach. Instead, it goes to the bowels where bacteria are able to use it to grow, supporting bowel function and general health. Inulin powder is a favorite among shoppers. According to the reviews, other inulin powders can come with a not-so-great taste, but the Swanson Ultra powder remains a highly rated item. You can also get inulin through supplements like Full Spectrum Jerusalem Artichoke. No matter the form, inulin is a great way to promote healthy digestion.