Caffeine is the most widely consumed and relaxing drug in the world. Caffeine's Chemical Composition is C8H10N4O2. It's Molecular Composition is as follows: The medical name, taken from its molecular composition, is 1,3,7-trimethylxanthine. It consists of 8 carbon atoms, 10 hydrogen atoms, 4 nitrogen atoms and 2 oxygen atoms. The chemical name of Caffeine is 1,3,7-Trimethylpurine-2,6-dione. Caffeine is found in the leaves and fruits of certain plants. It can also be found in energy bars, cough syrup and slimming pills. The Properties of Caffeine Molecule are that It is a white, odorless, hygroscopic crystalline solid. Caffeine tastes salty and has a mass of 1,23 g mL-1 and a melting point of 235 oC and decomposes at higher temperatures. It's water soluble. Caffeine is very relevant in our World. Millions drink it every day to increase alertness, minimize fatigue, and boost attention and concentrate.