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Antioxidant Support500 mg Per CapsuleGreen Foods FormulaHerbal SupplementSourced From Brown SeaweedSupports Immune FunctionStandardized to 40% Total PolysaccharidesScience-Backed Quality Since 1969Swanson GreenFoods Maximum Strength Fucoidan Extract is standardized to 40% total polysaccharides our Fucoidan brown seaweed extract supplement is available in 500 mg capsules. Preliminary research suggests that they may support the human immune system.