Reiki—the alternative medicine therapy that's becoming mainstream Reiki is a subtle, non-invasive form of healing that uses spiritually guided life force energy, and 60% of top hospitals in the United States now offer it as complementary treatment for anxiety, depression, pain relief, and more. Reiki For Dummies is a clear and easy-to-follow guide to the origins of Reiki, where you can study Reiki, what it can do for you, what to expect in a session, and how to use Reiki at h