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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.
1 Wheat Dextrin (e.g., Benefiber in the U.S.) is another type of non-viscous, soluble fiber that is considered a bulk-forming laxative. 2  Since it is non-viscous, it does not form a gel in the digestive tract that binds with cholesterol, rendering it ineffective in lowering blood cholesterol. Psyllium (e.g., Metamucil) is a viscous, soluble fiber that is the most common fiber source in supplements. 2  Psyllium's cholesterol-lowering ability has earned the FDA's approval, allowing foods containing psyllium to make a health claim about reducing risk of heart disease.