Reliable. Chang Haicang, a famous TCM health expert, a nourishing culture promoter of Chinese cream, and the executive director of the Sub-health Professional Committee of the World Federation of Chinese Medicine Societies. Therefore, Chang Haicang is reliable. Chinese medicine was born in primitive society, and the theory of Chinese medicine was basically formed in the Spring and Autumn Period and the Warring States Period, and was summarized and developed in past dynasties.