Starbucks coffee in the United States is among the strongest available in the country, according to the Wall Street Journal. The newspaper compared caffeine content across café chains and less specialised outlets, such as Dunkin’ Donuts, and found that Starbucks had, on average, 56% more caffeine. Starbucks says that on average, its coffee drinks contain 320mg of caffeine in a medium cup. The findings go against customer opinion in the United Kingdom, which commonly find Starbucks to be among the weaker brands. Starbucks UK confirmed that the company brewed its coffee to the same strength around the world.