Mannan is a cosmetically employed polysaccharide from the tubers of the konjac plant (Amorphophallus konjac), which is native to Japan and China. It is used as a basis for the gel that gives skin care and hair care products their creamy consistency. In addition, it has slightly film-forming, moisture binding properties. Mannan is very well tolerated and is therefore suitable for use with sensitive skin.
see. Heike Käser 2010 "Natural Cosmetic Raw Materials", Linz, Freya Verlag, 3rd Edition 2012