Does Decaf Coffee Still Have an Effect? Unpacking the Truth
                                
                                
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                                    4 min read                                
                            
                                An 8-ounce cup of decaf coffee typically contains 2 to 5 milligrams of caffeine, compared to a regular cup's 95 milligrams. This residual caffeine means that yes, decaf coffee still has an effect, particularly for individuals highly sensitive to the stimulant.