Fucoidan is a unique water-soluble polysaccharide combined with sulfate groups, also known as sulfated polysaccharide or fucoidan sulfate, primarily found in brown algae and some sea cucumbers.

Fucoidan possesses over 20 physiological functions, including bidirectional immune regulation, free radical scavenging, anti-aging, anticoagulant and antithrombotic effects, antitumor and anti-HIV properties, alleviation of gastrointestinal disorders, anti-allergic effects, liver function enhancement, reduction of hyperlipidemia and hypertension, stabilization of blood sugar levels, as well as promoting skin regeneration and moisturization.