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Food-grade brown algae such as mozuku, wakame, and konbu (tangle) contain a polysaccharide known as fucoidan. Fucoidan is one of the ingredients that give seaweed its characteristic slippery texture, and its name is a general term for a substance that naturally occurs as an oxygenated polysaccharide primarily made up of fucose, uronic acid, and a sulfate acid base.

Fucoidan manufactured by this method is a brown powder with a slight scent of seaweed.
Fucoidan is reported to have an array of biological functions, of which the main functions include
(1) anticoagulant action;
(2) cholesterol-lowering action;
(3) protective effect on the stomach lining; and
(4) anti-tumor action.