Fucoidan can improve the function of immune system. It can increase the secretion of cytokine IL-1 and TNF(tumor necrosis factor), as well as the respiratory burst capacity of macrophages, so that the immune function could be improved.
Reference
Effects of Fucoidan and Its Fraction Isolated from Laminaria japonica on Immunity of Broiler Macrophages in vitro, Scientia Agricultura Sinica, Vol.41, No.5, 2008
