Are you sure that's not just the Chinese herbalists creating that mystique in order to protect their business?
You had a similar thing in European herbalism, which was kept secret from the general public to protect the business interests of the physicians of the day. It was only after Culpepper's famous herbal book that the poor masses got access to herbal medical info, and then people realized they could make their own herbal formulas by gathering the right plants, and so were thereafter not dependent on expensive doctors.
Here is a description of Four Herbs: these are the four I am taking and they are wonderful. You can still have an adverse event, like when stressed out.
"When unified in a formula, herbs share the responsibility of the intended treatment goal. One of the formulas that is used to treat IBS includes a base of four herbs: bai shao (white peony), bai zhu (white atractylodes), chen pi (citrus peel) and fang feng (siler). TCM pathology uses terminology that sounds unfamiliar to western medical concepts, however it is simply a different way of explaining the same action of the compound. The purpose of each herb in the formula is defined by it’s own individual actions and plays a part in the general purpose of the formula. For example, white peony is an herb that ‘soothes the liver,’ in other words it relieves stress. To take one herb alone for IBS would be inadequate so there is the addition of the others. White atractylodes has the action of ‘tonifying the spleen,’ in other words it helps nutrients to absorb in the small intestine. Citrus peel supports the digestive function by ‘transforming dampness,’ in other words it reduces abdominal bloating. And lastly, siler has the function of ‘expelling wind,’ in other words, it relieves diarrhea."
Note the terminology above is in reference to the Qi. Liver Qi, Spleen Qi..not those organs per se.
I will just mention that I got odd headaches during the day for about the first week. They have subsided. More slog moved, apparently.
oh: I better go hurry and have some more tea!!