This 32-ounce drink clocks in at an eye-opening 392 milligrams of caffeine, the most of any Dunkin’ drink; the medium has 294 milligrams, and the small has 196 milligrams.
For context, the average 8-ounce mug of brewed coffee contains around 95 milligrams of caffeine, and the Mayo Clinic recommends a daily limit of 400 milligrams.
At most coffee shops, cold brew coffee is more caffeinated than iced coffee. However, this isn't true at Dunkin' — the large cold brew has 347 milligrams of caffeine.