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Caffeine is a popular and legal stimulant found in coffee, tea, chocolate, and many sparkling beverages.
|Product||Serving size||Caffeine per serving (mg)||Caffeine per liter (mg)|
|Caffeine tablet (regular-strength)||1 tablet||100 mg||—|
|Caffeine tablet (extra-strength)||1 tablet||200 mg||—|
|Excedrin tablet||1 tablet||65 mg||—|
|Hershey's Special Dark (45% cacao content)||1 bar (43 g; 1.5 oz)||31 mg||—|
|Hershey's Milk Chocolate (11% cacao content)||1 bar (43 g; 1.5 oz)||10 mg||—|
|Percolated coffee||207 mL (7 U.S. fl oz)||80–135 mg||386–652 mg|
|Drip coffee||207 mL (7 U.S. fl oz)||115–175 mg||555–845 mg|
|Coffee, decaffeinated||207 mL (7 U.S. fl oz)||5–15 mg||24–72 mg|
|Coffee, espresso||44–60 mL (1.5-2 U.S. fl oz)||100 mg||1691–2254 mg|
|Black tea||177 mL (6 U.S. fl oz)||50 mg||282 mg|
|Green tea||177 mL (6 U.S. fl oz)||30 mg||170 mg|
|Guayakí Yerba Mate (loose leaf)||6 g (0.2 U.S. oz)||85 mg||~358 mg|
|Coca-Cola Classic||355 mL (12 U.S. fl oz)||34 mg||96 mg|
|Mountain Dew||355 mL (12 U.S. fl oz)||54 mg||154 mg|
|Vault||355 mL (12 U.S. fl oz)||69 mg||194 mg|
|Jolt Cola||695 mL (23.5 U.S. fl oz)||280 mg||403 mg|
|Red Bull||250 mL (8.2 U.S. fl oz)||80 mg||320 mg|
The word 'caffeine' was an invented word meaning "chemical found in coffee". Ironically, caffeine was already very popular across the world as it is also present naturally in tea.
Caffeine is considered safe in any amounts by the United States Food and Drug Association, though in can cause a rapid heartbeat. Because of this some people attempt to lessen their intake of the chemical by drinking de-caffeinated coffee or tea that does not contain caffeine. While the majority of coffee drinkers find this odd, the removed caffeine is added as pain relievers, energy drinks, and flavoring to carbonated soft drinks.