Host Defense Reishi Organic Mushroom - Reishi has been respectfully called the “mushroom of immortality.” Reishi grows throughout the world, primarily on hardwood trees, and is well known for supporting general wellness and vitality. Host Defense Reishi Capsules use activated, freeze-dried, Certified Organic mycelium, with a full spectrum of constituents: polysaccharides (beta glucans, arabinoxylane, glucose, xylose, galactose and mannose), glycoproteins, ergosterols, triterpenoids and other myco-nutrients, which are essential for supporting natural immunity.