The molar mass of caffeine is 194 grams per mole. It has a chemical structure of C8H10N4O2. It is considered a stimulant drug. Caffeine is found naturally in many seeds, leaves and fruits of plants, plus it is artificially added to many beverages and food items for consumers.
In humans, caffeine acts as a central nervous stimulant. It temporarily removes drowsiness and can make a person become temporarily alert and aware of his surroundings. Worldwide, caffeine is the most widely used drug. However, unlike many other popular drugs, caffeine is unregulated and is completely legal throughout many parts of the world.