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Immune SupportHerbal SupplementSupports Immune Health at a Cellular LevelFortifies the Body's Natural Immune Response Excellent Cellular DefenderScience-Backed Quality Since 1969For cellular-level immune system support Swanson Agaricus Blazei Mushroom Extract is an excellent choice. Among Japan's most extensively researched immune-boosting mushrooms Agaricus Blazei contains much higher concentrations of beta glucans than other tonic mushrooms such as maitake shiitake and reishi making it one of the world's most powerful cellular protectors. Our Agaricus Blazei Mushroom Extract is standardized to 30% polysaccharides for guaranteed potency in each capsule.