Is 42 mg of caffeine a lot? Breaking Down Your Daily Intake
                                
                                
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                                    4 min read                                
                            
                                An 8-ounce cup of black tea contains approximately 42 mg of caffeine, a relatively modest amount compared to many other popular beverages. For most healthy adults, this dosage is well within safe daily limits, but is 42 mg of caffeine a lot for everyone?