Sourced from brown seaweed Supports immune health Standardized to 40% total polysaccharides Vegetarian Per GMP guidelines set forth by the FDA, most products are formulated for 24 months from the date of manufacture. Liquids and probiotics are formulated for 12 months. Swanson GreenFoods Maximum Strength Fucoidan Extract is standardized to 40% total polysaccharides, our Fucoidan brown seaweed extract supplement is available in 500 mg capsules.