... products in the world. Glucomannan is a fiber, a water-soluble polysaccharide, which has been ... The underground tubers of konjac have a round shape and look like big water chestnuts. Their diameters ... can be over 25 cm. With rich nutrients, konjac has a ... phosphorus, selenium, etc. Besides, it also contains a content of over 45% of Polysaccharide Konjac, i ...