Caffeine is a central nervous system (CNS) stimulant, having the effects of temporarily warding off drowsiness and restoring alertness. Caffeine is the most widely consumed psychoactive substance, but unlike many other psychoactive substances it is legal in nearly all jurisdictions. People take caffeine to increase alertness and wakefulness, have faster and clearer flow of thought, increased focus and better general body co-ordination. It is these effects that make caffeine of interest to a wide audience and particularly those in sports and training.
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