Is there caffeine in Dunkin' Hard iced coffee? Yes, But Less Than You Think
                                
                                
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                                    4 min read                                
                            
                                According to the Dunkin' Spiked website, a 12-ounce can of their Hard Iced Coffee contains about 30 mg of caffeine. This means that while there is caffeine in Dunkin' Hard Iced Coffee, the amount is notably lower than what you'd find in a standard cup of their non-alcoholic brew.