Caffeine: A central nervous system and metabolic stimulant, and is used both recreationally and medically to reduce physical fatigue and to restore alertness when drowsiness occurs. It produces increased wakefulness, faster and clearer flow of thought, increased focus, and better general body coordination. Please note there is only a moderate dose of caffeine in our product (comparable to 2/4 to 3/4 of a cup of coffee).