Fucoidan is a natural compound found mainly in brown seaweed such as kombu, wakame, and mozuku. It is a type of sulfated polysaccharide (a complex carbohydrate) that has been studied for its potential effects on immune function, inflammation, and overall health. Fucoidan is available as a supplement in capsules, powders, and liquid extracts.
Fucoidan appears to affect several biological processes in the body. Research suggests it may help support the immune system, act as an antioxidant, and influence inflammatory responses. Some laboratory and early human studies also suggest that fucoidan may play a role in supporting gut health and normal cell function. However, more high-quality clinical research is needed to fully understand how it works in humans and how effective it may be for specific conditions.
People commonly use fucoidan for immune support, general wellness, digestive health, and as an antioxidant. It is also sometimes promoted for supporting healthy aging and overall cellular health.