Hong Zun, a bachelor of Zizheng Palace in the Southern Song Dynasty, wrote a book on traditional Chinese medicine. In his spare time, Hong Zun was familiar with medical books, cared about people's illnesses, collected medical prescriptions, and carried out treatments, which achieved many results. In his later years, his many years of searching for effective medical prescriptions was published in a book called "Hong's Collection of Prescriptions". The accepted recipes come from Santu. First, "to those who have experienced it throughout their lives"; second, to "those who have heard of it even though it has not yet been used"; third, to quote doctors' prescriptions.
