Why should the traditional application experience of traditional Chinese medicine emphasize "authenticity"?

After long-term growth and reproduction in a certain area, various medicinal plants and animals gradually adapted to the environment in this area, thus forming the main producing areas of some drugs. The quality and efficacy of the same drug vary from place to place, so the traditional application experience of traditional Chinese medicine emphasizes "authenticity". Medicinal materials with excellent variety, quality and curative effect produced in a place are called "authentic medicinal materials" (also called "authentic medicinal materials"). Materia Medica Yi Yan: "Whoever uses drugs must choose the right place, so the drugs are effective and well-founded", pointing out that natural conditions such as climate, soil and water are closely related to the growth, odor formation and curative effect of medicinal materials. Physicians in past dynasties attached great importance to the application of authentic medicinal materials.