Book excerpt: Mushrooms have been used as medicine for thousands of years and their value in boosting immunity, improving memory, and even fighting cancer is being recognized and documented in scientific research. Christopher Hobbs, a mycologist and herbalist at the forefront of contemporary research, profiles the most powerful medicinal mushrooms and explains the nutritional and medicinal compounds in each one. Detailed instructions cover how to select, store, and prepare each variety for use. Whether readers are growing or foraging their own mushrooms, or sourcing them from a local provider, this essential handbook will guide them in making health-boosting medicine.