**2. What Is Fucoidan**

Fucoidan is a type of sulfated polysaccharide which contains a significant portion of L-fucose. Fucoidans are mainly extracted from brown seaweeds and one of the well-known bio-active polysaccharides collected from seaweeds [1]. Earlier Fucoidan was named as "fucoidin" when it was first separated from seaweeds by Kylin in 1913. According to the IUPAC rules correct term is fucoidan. However, some people still use fucosan, fucan, and sulfated fucan instead of fucoidan [2]. In recent years, fucoidan has been extensively studied due to its beneficial and interesting biological activities [3]. Specifically, fucoidan possess numerous bioactive properties such as, anti-inflammatory, immunomodulatory, antioxidant, anticoagulant, antivirus, anticancer, and gastric protective properties.
