 As long as the practitioner has correctly determined the constitution of the patient, then the herbal formulas for that constitution will all fundamentally agree with them and cause no irreversible harm.The healing energies of the herbs all fall into one of the Five Elements, so if the herbal formula was a combination of Five Elements that was compatible with the Five Element makeup of the patient's internal organs/energies, then in theory they would experience a beneficial response to the herbal formula.Through this system of testing, matching the Five Element natal chart with the Five Element energies of the herbal formulas, Master Sunim discovered that the natal charts did indeed provide an extremely accurate picture of the internal energy condition of the patient, and therefore showing the patient's body constitution.