Psyllium /ˈsɪliəm/, or ispaghula /ˌɪspəˈɡuːlə/, is the common name used for several members of the plant genus Plantago whose seeds are used commercially for the production of mucilage.
Psyllium is mainly used as a dietary fiber to relieve symptoms of both constipation and mild diarrhea and occasionally as a food thickener. Research has also shown benefits in reducing blood cholesterol levels.
The plant from which the seeds are extracted tolerates dry and cool climates and is mainly cultivated in northern India. Psyllium products are marketed under several brand names, such as Metamucil, Fybogel, Konsyl, and Lunelax.