Purity >85%. Fucoidan is a sulfated polysaccharide found in various species of brown seaweed and algae that demonstrates anticancer, antiviral, neuroprotective, immune-modulating, and many additional diverse biological effects in animal models. It is reported to target natural thrombin inhibitors, P- and L-selectins, various complement enzymes, CD4 glycoproteins on T lymphocytes, digestive enzymes involved in the absorption of glucose, kinases that drive mitosis such as MAPK, caspases involved in apoptosis, angiogenesis-promoting HIF-1, NK cells, T cells, and dendritic cells. Fucoidan has also been studied for its potential use in nanosystem applications such as drug delivery or tissue engineering.