Psyllium seed husks are indigestible in human beings and are often used as a source of dietary fiber. They are used to relieve constipation, irritable bowel syndrome, diverticular disease and diarrhea. They are also used as a regular dietary supplement to improve and maintain regular GI transit. The inert bulk of the husks helps provide a constant volume of solid material irrespective of other aspects of the diet or any disease condition of the gut. Some recent research is also showing them to be promising in lowering cholesterol and controlling diabetes.