The therapy predominantly uses leaves, flowers, roots, and barks. A TCM practitioner can choose from 350 plant parts. In rare cases, mineral or animal substances are also used, with careful consideration for species protection and ecological balance. The composition of mostly plant-based active ingredients is based on detailed knowledge of their effects and contraindications, derived from profound expertise and experience. The application of these medicinal substances is integrated into a holistic theoretical framework, precisely aligning each remedy with functional circuits and disease factors. The properties of the medicines are differentiated and detailed in the literature of Chinese Medicine. With this knowledge and thorough examination, a TCM practitioner can create a personalized prescription. Even if two patients have the same illness, their prescriptions will likely differ, as Chinese Medicine considers each individual’s constitution and psyche. This results in considerable variation in the composition and concentration of active ingredients per patient. If symptoms are treated over a long period, the composition and intensity of the Chinese natural medicines can be adjusted. For example, a lower dose of a particular active ingredient may be required after prolonged use. Unlike often in Western medicine, there are no standard answers in TCM, as sometimes only a limited number of drugs are approved for certain diseases, which must be used for all patients.