Hailed in ancient Eastern medicine as the “mushroom of immortality” and the “medicine of kings”, the Eastern world has been using Reishi for thousands of years, particularly in China and Japan. Even the ancient kings and emperors drank Reishi tea because it was believed that its properties encouraged vigor and long life. They also thought that the tea would increase their wisdom and happiness. The use of Reishi has reached the Western world where these days people are making elixirs from the mushroom for the purpose of promoting vitality and longevity. It is also used to treat certain medical conditions.