This is a philosophical question best answered by your own research and contemplation. Some people choose not to take synthetic medicines because of the side effects and the conventional practice of treating the symptom instead of the cause. To read about the mechanism of action for natural substances you may consult the hundreds of thousands of books in a variety of cultures and over many generations that have been written. You may begin reading the history of medicine in China, Greece, India, etc. A general question such as yours is well beyond the scope of this website, and beyond anyone's available time in a single lifetime.
Dr. Karen Benton, Naturopathic Physician
answered by Dr K B N