Glucomannan fiber

Glucomannan fiber is a high-molecular-weight, water-soluble dietary polysaccharide extracted primarily from the tubers of the konjac plant (Amorphophallus konjac), consisting mainly of D-mannose and D-glucose monomers in a roughly 1.6:1 ratio, linked via β-1,4 glycosidic bonds. It is notable for its extremely high viscosity and ability to absorb water and form a gel, which underlies its effects as a bulking laxative, an agent that promotes satiety for weight control, and a cholesterol-lowering supplement. It is not a cellular or protein-based therapeutic target, but rather a bulk-acting dietary fiber with beneficial and mechanical effects in the gastrointestinal tract. Common side effects include gastrointestinal discomfort and, rarely, obstruction if not taken with adequate fluids.

Other names

Konjac glucomannanKonjac mannanKonjac fiberKonjac flourGlucomannan powder

Mechanical bulk-forming effect: absorbs water, swells, and forms a gel that slows gastric emptying, carbohydrate/sugar/fat absorption, and provides satiety. Binds dietary cholesterol and bile acids in the intestine, leading to reduced absorption and lower serum cholesterol. Acts as a prebiotic fiber, altering gut microbiota composition.