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For Heart Health: Psyllium fiber, the natural dietary fiber found in Metamucil, is clinically proven to help lower cholesterol levels because it forms a thick gel that traps some cholesterol, bile acids and waste in the gut.
Recent Examples of supplemental from the Web. 1  Common supplemental fibers include: Metamucil (psyllium fiber) â Provides 2.4 grams soluble fiber. â , Cincinnati.com, Why health experts emphasize fiber, 17 July 2017. 2  Watch for supplemental water needs over the winter.