Li Shizhen said in his book that pig manure was nontoxic and detoxified, because many people at that time would question the theory of Chinese medicine and think it was unscientific. What we see now, in fact, many theories are really immature.
But in ancient times, some doctors thought that pig excrement could detoxify because they saw that he lived in a dirty and chaotic environment, but in fact this may be just a theory. Because if you look at Compendium of Materia Medica, it may be a kind of medical book with more emphasis on taste.
Moreover, in ancient times, people were very appreciative of the traditional idea of supplementing shapes with shapes, so we can see that this idea runs through this book in Compendium of Materia Medica. Many people may think that Compendium of Materia Medica is a famous literary work, but in fact some methods can't be adopted because there is no scientific theoretical basis to prove that it can cure diseases.
So we see that Li Shizhen has included many incredible drugs and some prescriptions in this book. In fact, there is no way to prove whether it is effective. I suggest you not try it easily.
Although many people have expected the Compendium of Materia Medica, it is pure natural, non-irritating, non-side-effects, and can preserve health and so on. But if it were me, I wouldn't try it easily, because after all, many things are very unacceptable.