The double-blind trial tested two inexpensive plant-fiber prebiotics that are available over the counter in many countries.
One of the supplements was inulin, a dietary fiber in the fructan class. The other, fructooligosaccharide (FOS), is a plant carbohydrate often used as a natural low-calorie sweetener.
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Cheap Daily Supplement Appears to Boost Brain Functions in Older People | Spyke
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