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Caffeine is the most casually and widely used ergogenic aid in the world. Elite athletes and regular exercisers alike use it. Caffeine is found naturally in chocolate, coffee, tea and is added to foods such as soft drinks.
Claimed ergogenic properties
 Lowers perception of effort, wards off drowsiness and increases alertness by stimulating the central nervous system.

 Increases the amount of energy derived from fat, thus theoretically sparing glucose and glycogen stores and delaying the onset of fatigue in long distance runs (over 20 miles).
Scientific evidence for these ergogenic properties
 Well-controlled laboratory studies involving running or cycling after taking placebo or 3-13 mg c...