Caffeine: The most common stimulant, found in coffee, Coke and Mountain Dew. Found in much higher quantities in energy drinks. Most energy drinks contain between 70 and 200 mg. A 5 oz cup of coffee contains 110-150mg for drip, 65-125mg for percolated, and 40-80 mg for instant. Dr. Pepper gives you 61mg, and a can of Coke provides 50mg. A full can
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