Psyllium (seed husk) is a mixture of polysaccharides derived from the husks of the seeds of Plantago plant species. It has a high level of soluble dietary fiber. Psyllium is used in processed foods, such as cereals, and in various dietary supplement formulations to increase fiber intake. It passes through the gastrointestinal tract largely unchanged 1. Psyllium seed husk is approved for use as a source of dietary fiber by the U.S. Food and Drug Administration (FDA) (21CFR101.81) 2.