A psyllium husk is the crushed seeds of a plant, and a great source of soluble fiber. They form bulk bulk in the intestines because the soluble fiber from psyllium husk forms a gel when mixed with liquid. Be sure you drink you water when you take them, to help things move along smoothly
I get psyllium in cap form at Target. A huge bottle is less than $5.00 and it works like a charm.