The melting point of caffeine is 458.6 degrees Fahrenheit. A compound containing carbon, hydrogen, nitrogen and oxygen, pure caffeine occurs as a crystalline, odorless white powder. Caffeine is found in the leaves, seeds and fruits of various plants, including coffee, tea and kola.
In some of these plants, caffeine acts as a natural insecticide. Caffeine is a stimulant that acts on the central nervous system. It is the most popular legal stimulant in the world. Humans take caffeine in soft drinks, coffee, tea and energy drinks. In normal quantities, caffeine has minimal long-term effects, but high doses can be dangerous, according to the Royal Society of Chemistry.