Psyllium

Psyllium is derived from the Plantago ovata plant. Psyllium appears to decrease hyperglycemia in response to dextrose intake, when it is given simultaneously with dextrose, possibly by interfering with glucose intestinal absorption. Psyllium remains predominantly in the gut as a "bulk" agent. It is somewhat resistant to fermentation and is passed largely unchanged through the gastrointestinal tract. It has significant "water-holding" capacity due to its high hemicellulose content.