Credible. Zhang Heyao has been devoted to the study of Taoism and TCM health care for many years. His book is easy to understand and practical. According to the Five Elements Health Care Law in the book, 10,000 common female diseases have been successfully cured, so it is credible. Zhang Heyao, a first-class teacher of traditional Chinese medicine in a medical research institute in Beijing, is the author of Discipline of Not Being Sick: A Collection of Women's Physical and Mental Care, Beauty Wisdom and Skin Change Destiny.