**6. Conclusions**

Functional food is considered to be any food or food component that provides health benefits beyond basic nutrition. Recently, considerable attention has been directed by consumers towards functional ingredients from food, because of the lack of side effects. Compared with other polysaccharides, fucoidans are sulfated polysaccharides and are very active in their functions. In order to be commercially and widely available as functional food additives, a large number of fucoidans have been investigated in recent years.

**Funding:** This work was supported by the 2021 education, research and student guidance gran<sup>t</sup> funded by Jeju National University.

**Conflicts of Interest:** The author declares no conflict of interest.
