In science, chemistry, keme- "earth/black art" + -ist "performer" + -ery "activity", is the study of elements and the structures they form and is primarily concerned with effects due to the valence electrons in atoms and their effects on the formation and dynamics of molecules, chemical species, or other chemical entities.  In 1753, chemistry was defined as the physics of small bodies. 
Human chemistry is the branch of chemistry concerned with the science, principles, and laws of chemistry applied to interactions between human beings. The study of human molecules (people) or human elements and the structures they form, focusing on the effects due to valence electrons in atoms is called "human chemistry". 
● Affinity chemistry
● Physical chemistry
● Surface chemistry
1. Daintith, John. (2005). Oxford Dictionary of Chemistry. New York: Oxford University Press.
2. Chemistry (Chymie) – Encyclopedia of Diderot & D’Alembert (1753).
3. (a) Thims, Libb. (2007). Human Chemistry (Volume One), (preview). Morrisville, NC: LuLu.
(b) Thims, Libb. (2007). Human Chemistry (Volume Two), (preview). Morrisville, NC: LuLu.