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Psyllium offers several advantages over other dietary sources of bulk fiber.
Psyllium supplies approximately five times more soluble fiber than oat bran, and eight times more than wheat bran. Virtually all of the residual non-soluble fiber found in most feed grade products is removed. Laboratories use this fact to conduct a standard evaluation of psyllium quality and gel-forming action, the swell volume test. In this assay, the psyllium sample is mixed with a specific quantity of water. The growth in volume is then measured over time to develop a score for the psyllium being tested.