There is no a corner of the planet that does not have mushrooms or fungi. They are one of the most extensive living organisms on Earth, second only to insects in number and diversity. This vast, mostly unexplored realm of living organisms is also an incredible resource of potential medicinal value and a nutrient rich resource that scientists have yet to fully discover. Mushrooms will undoubtedly become a new generation of drugs that will turn the views of physicians on the problems of treating various disease and illness. This book presents about 300 species of medicinal fungi which have a restorative and tonic effect on the immune system and some of which possess anti-tumor properties and can be used as a natural way to in the help treat a variety of cancers and other serious illnesses through strengthening the immune system. Knowledge of the application of mushrooms and their use not only as food, but also as medicine, will help people find an alternative way of maintaining health in our modern societies rife with stress, pollutants and man made toxins.