What is the strongest type of espresso?
                                
                                
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                                    4 min read                                
                            
                                According to the U.S. Department of Agriculture, a single espresso shot has about 63 milligrams of caffeine, but the answer to what is the strongest type of espresso is far more complex than a simple number. The term "strongest" can refer to either the highest concentration of flavor or the highest total caffeine content.