Psyllium

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 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.

Psyllium is mainly used as a dietary fiber, which is not absorbed by the small intestine. The purely mechanical action of psyllium mucilage is to absorb excess water while stimulating normal bowel elimination. Although its main use has been as a laxative, it is more appropriately termed a true dietary fiber and as such can help reduce the symptoms of both constipation and mild diarrhea. The laxative properties of psyllium are attributed to the fiber absorbing water and subsequently softening the stool. It is also one of the few laxatives that does not promote flatulence.

As well as aiding in intestinal transit, several studies point to a cholesterol reduction attributed to a diet that includes dietary fiber such as psyllium. The use of soluble-fiber cereals is an effective and well-tolerated part of a prudent diet for the treatment of mild to moderate hypercholesterolemia. Although the cholesterol-reducing and glycemic-response properties of psyllium-containing foods are fairly well documented, the effect of long-term inclusion of psyllium in the diet has not been determined. Supplementation with fiber as ispaghula husk may have adverse effects on colorectal adenoma recurrence, especially in patients with high dietary calcium intake.

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