Coffee beans generally only have enough caffeine for one use. Caffeine content from a coffee bean depends on the plant the bean is harvested from. Arabica beans from Central and South America produces about 1.1% caffeine. The stronger robusta beans from Indonesia and Africa produces around 2.2% caffeine. For Americans a normal cup of coffee averages about 75 mg of caffeine. However, preparation and size of the cup will make a different in the amount of caffeine.
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