Caffeine levels depend on preparation

(From BCuz.com)
Depending on the type of coffee and method of preparation, the caffeine content of a single serving can vary greatly. On average, a single cup of coffee of about 207 milliliters (7 fluid ounces) or a single shot of espresso of about 30 mL (1oz) can be expected to contain the following amounts of caffeine:[81][82][83]

 

Author: Susan Bate

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