Do medium Dunkin' refreshers have caffeine? Your definitive guide
                                
                                
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                                    3 min read                                
                            
                                A medium-sized Dunkin' Refresher contains approximately 99 milligrams of caffeine, derived from the green tea extract present in the drink's concentrated flavor base. This fact often surprises customers who perceive the fruity beverage as a caffeine-free alternative to coffee.