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Immune Support500 mg Per CapsuleHerbal SupplementTotal Wellness For Mind Body & HomeUnsurpassed Purity & PotencyScience-Backed Quality Since 1969Bolster your body’s natural defenses with the powerful immune support of Swanson® Superior Herbs Shiitake Mushroom Extract. For thousands of years traditional Chinese and Japanese herbalists have treasured the shiitake mushroom for its unique immune-boosting properties. Modern science has revealed that shiitake mushrooms have unique polysaccharide constituents with a wide range of protective benefits throughout the body. Shiitake mushrooms can help support cardiovascular health boost energy and brain function promote skin health and more.