http://en.wikipedia.org/wiki/Psyllium_seed_husks
Over-the-counter laxatives and fiber supplements such as Metamucil, Serutan, Effersyllium, and Isabgol have psyllium husks as their main ingredient, in finely chopped or powdered form.

http://www.organicindiausa.com/product_info.p...
In whole husk form, derived from the seeds of the herb plantago ovata, Psyllium husks are a rich source of soluble fiber. They naturally promote healthy elimination and regularity while supporting the gastrointestinal system

http://www.immunesupport.com/psyllium_husk.htm
For thousands of years Psyllium husks have been used in Europe, North Africa, and Asia as a laxative. Psyllium husks and seeds are often called by their folk name of flea seed because of their brown coloring and small size.