Radiant health is defined in China as "health beyond danger." Radiant health is dependent upon one's ability to adapt appropriately and effectively to all the stresses that one encounters in the course of one's life. Tonic herbs are said to provide “adaptive energy” which helps us handle stress much more easily. It is possible to develop a very high degree of adaptability to the many challenges we face and the changes that constantly take place in our lives. By overcoming stressful circumstances successfully, we grow as human beings and we enjoy life much more fully. The superior herbs are thus a primary source of true human empowerment. Tonic herbs are widely believed in the Far East to be transformational.