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Immune Health600 mg Per CapsuleHerbal SupplementMaintains Immune HealthSupports Liver Health and DetoxificationSupports a Normal Response to Daily StressScience-Backed Quality Since 1969Swanson Reishi Mushroom is a defense shield for your body. Reishi mushrooms enhance the immune system because they reinforce your body's defenses. Native to Asia reishi mushrooms also support a healthy response to daily stressors.