Macrocystis fucoidan is a fucan sulphate occurring in brown marine algae (Phaeophyta), typically Macrocystis pyrifyra, and has been shown to have anti-coagulant activity. The fucose content of this fucan is approx. 31% and it also contains galactose (approx. 2.2%, uronic acid (approx. 12.4%) and sulfate (approx. 32.5%). Other therapeutic indications are reported in the literature:
Fitton H. J., Stringer D. N. and Karpiniec S. S., Therapies from Fucoidan: An Update, Marine Drugs, 13, 5920-5946 (2015)