Premium Immune System Support. Maitake Mushroom. Shiitake Mushroom. Reishi Mushroom. Cordyceps Mushroom. Chaga Mushroom. Premium Immune System Support. Zahler Myco5Defense includes a rich blend of organic mushrooms designed to potentiate and activate immune system functioning. This advanced formula helps support cellular protection. Zahler Myco5Defense includes a rich blend of 5 organic mushrooms designed to potentiate and activate immune system functioning. This advanced formula helps support cellular protection. Also included is Selenium to provide maximal gains. The MycoFusions materials are natural complexes of mushroom compounds which support robust immune function.