Psyllium is the common name for several members of the plant genus Plantago. This small herbaceous plant is believed to be native to southern Asia and Europe, with most commercially produced Psyllium coming from India.

Psyllium is a true dietary fiber, even though it is classified by some as a laxative or mucilaginous fiber, and is a convenient way to increase intake of dietary fiber because of its high mucilage content. This bulking agent swells considerably when added to liquid, which can help to support healthy gastrointestinal transit time. This bulking action and healthy transit time can play an important role in maintaining healthy gastrointestinal function.