Water and the human body behave almost alike whenever any external substance is introduced in contact with them, in respect to generation of potential /emf. Here we demonstrate that every potency of any metal /non-metal in pure water is different and it is also so in the human body. It also however differs from body to body. However the generation of potential for any three electrodes strictly follows the Law of Triangle. The results of this experimental work undoubtedly confirm Hahnemann’s individualization of medicine and individualization of a patient, as stated by him long ago.