Glucomannan is a water-soluble polysaccharide composing 40% by dry weight of the roots or corm of the konjac plant. Glucomannan is a dietary fiber, and has been marketed as a treatment for constipation, obesity, high cholesterol, Acne vulgaris (source) and Type 2 diabetes. Glucomannan is also a hemicellulose that is present in large amounts in the wood of conifers and in smaller amounts in the wood of dicotyledons.
