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Caffeine Content of Common Beverages
Quick reference to caffeine content of selected beverages, including coffee, tea, soft drinks, and energy drinks. Provides a brief introduction to caffeine, "a substance that exists naturally in certain plants. ... It can also be produced synthetically and added to foods and beverages." From the Mayo Foundation for Medical Education and Research.
http://www.mayoclinic.com/health/caffeine/AN01211
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