Host Defense Chaga Mushroom - Chaga grows primarily on birch trees. Studied and treasured worldwide for its health-enhancing and antioxidant properties, Chaga is a unique species, and the focus of recent and ongoing scientific research. Host Defense Chaga 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, mycoflavonoids, and other myco-nutrients, which are essential for supporting natural immunity.