Swanson ® Glucomannan is a food supplement that contains glucomannan obtained from the Riviera tuber ( Amorphophallus konjac K. Koch). The formula will work well as a supplement to the daily diet of adults, especially those looking for an additional source of dietary fiber. What properties does glucomannan have? Glucomannan, also called konjac mannan, is a substance of natural origin included in the water-soluble fiber fraction. After consumption, it is not subject to digestion. It passes through the entire digestive tract practically unchanged until it reaches the large intestine, where it is fermented by bacterial flora. Each capsule of the American brand Swanson® formula contains 665 mg of glucomannan, and a pack of 90 will provide 3 months of daily dietary fiber supplementation.