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Starbucks Grande Coffee: 330 milligrams. VitaminWater Energy Citrus: 42 milligrams (Source: www.energyfiend.com) What's in energy drinks. Caffeine: Side effects common for 200 millgrams or more. Taurine: Amino acid helps regulate heartbeat and muscle contractions. Guarana: Comes from South American plants. Increases alertness and energy. ................
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