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Tea usually contains
about half as much
caffeine per serving
as coffee, depending
on the strength of the
brew. Certain types of
tea, such as black and
oolong, contain some-
what more caffeine than
most other teas.
Soft drinks usually
contain about 10 to 50
milligrams of caffeine
per serving.
Energy drinks like Red
Bull have about 80
milligrams of caffeine
per serving.