Which Dunkin' Drinks Have the Most Caffeine?
                                
                                
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                                    5 min read                                
                            
                                According to Dunkin's own website, a large (32 oz) iced coffee contains nearly 400 milligrams of caffeine. For those wondering which Dunkin' drinks have the most caffeine, it is crucial to look beyond just the type of coffee and consider both the serving size and any added espresso shots.