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Fucoidan extract is also known as brown seaweed extract. Limited scientific research shows that the potential fucoidan benefits may be in promoting a healthy immune system. The primary active ingredients that make up this brown seaweed extract are polysaccharides and seaweed phenolics. Swanson GreenFoods Formulas features a high-quality Fucoidan Brown Seaweed Extract standardized to 40% total polysaccharides and 5% seaweed phenolics for consistent potency.