The variations are partly down to the variety of beans used.
A study reveals big differences in the amount of caffeine coffee-drinkers get from different high street chains.
According to Which? a medium cappuccino from Costa contains 325 milligrams - five times stronger than the same drink at Starbucks.
The variations are partly down to the variety of beans used.
Nutritionist Amanda Ursell says it might be useful for cafés to display this information:
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