Dr. Colbert's Fiber Zone is a natural bulk-forming fiber intended to help keep you full for hours. It can also be used to relieve constipation and detoxify from harmful toxins. The main ingredient in Fiber Zone is a premium form of psyllium husk that works to bind partially digested foods and carry them from your stomach through your small intestine. The water-soluble psyllium husk in Fiber Zone absorbs water in the gut to create a thick, gel-like substance similar to a sponge. Psyllium husk is hypoallergenic, gentle on the digestive tract, and works to soften stool to improve bowel movements. Our Fiber Zone contains two prebiotics, psyllium husk powder and inulin fiber, to relieve constipation, supports immune function, lower cholesterol, and promote satiety.*