Psyllium seed husks come from the seed stalk of the common plantago, which is also called Isabgol. It can be labeled a neutral natural fiber, because it can be used for both constipation and diarrhea. The characteristics of psyllium seed husks make them useful for any treatment that requires improvement or maintenance of transit time in the gastrointestinal tract, because 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.