Made with U.S. Grown Organic Mushrooms. Energy Support. Paul Stamets. About the Founder. Paul Stamets believes in the power of Mycelium the network of thread-like cells that produces mushrooms. Mentored by the greatest mycologists of our time he integrates and expands upon the knowledge of our ancestors. . Host Defense Cordyceps uses activated freeze-dried Certified Organic mycelium with a full spectrum of constituents: polysaccharides (beta glucans arabinoxylane glucose xylose galactose and cordycepic acid) glycoproteins ergosterols triterpenoids and other myco-nutrients which are essential for Supporting Natural Immunity. . The Source. • Full Spectrum of Active Constituents. • Grown & Processed in the USA. • Purity Assured. • Freeze Dried to Preserve Nutrients. • Bioavailable Heat Activated. • Optimized Peak Life Cycle Selection. • P Value® Certified for Maximum Growth. . From the Forest to our Farm to You™. . Host Defense Cordyceps. Himalayan mountain peoples have long used Cordyceps during strenuous high altitude activities. Recently professional athletes and fitness enthusiasts have discovered that Cordyceps may support increased oxygen uptake and higher endurance levels. People have also found that Cordyceps supports healthy sexual functioning.