A cup of tea may contain up to 3 times less caffeine than a cup of coffee - a release from the U.S. FDA. There is an impression that tea has more caffeine than coffee. It is true as far as a pound of loose tea to a pound of ground coffee. But when brewed, you can brew up to 150-200 cups of tea with a pound of loose tea, but with a pound of coffee only can make 60-80 cups. So, the per cup content of caffeine in tea is far less than a cup of coffee. A six ounce serving of coffee has about 110-140 mg of caffeine, whereas a 6 oz serving of black tea brewed for 3-minutes has only about 36 mg of caffeine. Green tea is generally thought to contain less caffeine per cup than black tea, this is only true if it is brewed in the traditional green tea method because more caffeine is released with higher water temperature.
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