Theoretically speaking, there is some truth in herbal health preservation on TV, but these truths must be combined with my own reality. Everyone's situation is different, and it is difficult for laymen to use them accurately. Besides, those principles are like that in theory, but many of them are not like that in practice. For example, it is said that Polygonum multiflorum Thunb can cure white hair, and Qibao Meidan can cure white hair. See how many old Chinese medicine practitioners are not white-haired, which seems reasonable in theory, but not all of them can be verified in practice.