Psyllium seeds

Psyllium seeds come from a species of plantain (Plantago psyllium) and are an excellent source of insoluble (as well as soluble) fiber. They are the basis of many safe commercial laxatives. You can buy powdered psyllium seed husks at health-food stores without the sweeteners, dyes, and flavors that are added to drugstore products. The only caution about this wonderful remedy for constipation is that it must be used with plenty of water; otherwise the fiber will form an obstructing mass that may add to your problems.