Picture from Reishi, Ling Zhi: 'Mushrooms of Immortality' in HuffPost
This mushroom is an antimicrobial, as well as fights cancer through stimulating the production of macrophages that increases the body's natural killer T cells. It also has great anti-inflammatory and antioxidant properties. Reishi mushrooms improve respiration because of their ability to enhance oxygen absorption, and some studies show it may even reduce the effects of aging from its role with reducing oxidative stress from free radicals. For more on this information and particular studies check out pages 231-238 of Mycelium Running by Paul Stamets.