Caffeine is a (CNS) of the . Caffeine is a stimulant compound belonging to the class of chemicals naturally found in , , and (to a lesser degree) or . It is included in many , as well as a larger amou...Caffeine is a (CNS) of the . Caffeine is a stimulant compound belonging to the class of chemicals naturally found in , , and (to a lesser degree) or . It is included in many , as well as a larger amount in . Caffeine is the world's most widely used psychoactive drug and by far the most common stimulant.
