Ingredient type

Fibers

Plant fibers such as inulin and glucomannan that feed gut bacteria, add bulk and can help with fullness and regularity.

Xylitol

Evidence: Limited

Xylitol is a sugar alcohol used to sweeten gum, mints and toothpaste. It does not feed cavity bacteria, but reviews rate the evidence that it prevents...

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Oat bran

Evidence: Moderate

Oat bran is rich in beta-glucan, a soluble fiber with good evidence for modestly lowering LDL cholesterol at 3 g or more a day. Direct evidence for bo...

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Flaxseed

Evidence: Moderate

Ground flaxseed provides fiber, mucilage and the omega-3 fat ALA. Several trials suggest it can improve constipation symptoms at doses of 10 g or more...

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Apple pectin

Evidence: Limited

Pectin is a soluble fiber found in apples and citrus peel. It showed benefits for constipation in a few trials at high gram doses, but evidence is thi...

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Glucomannan

Evidence: Limited

Glucomannan is a highly absorbent fiber from konjac root. Small studies suggest gram-level doses can modestly increase bowel movement frequency; weigh...

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Psyllium husk

Evidence: Strong

Psyllium is a soluble, gel-forming fiber and one of the best-studied bulk-forming laxatives. Trials consistently link it to more frequent, easier bowe...

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