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This study will be of critical importance for coffee junkies looking to maximise their caffeine hit.
![www.bbc.co.uk](/proxy.php?image=https%3A%2F%2Fichef.bbci.co.uk%2Fnews%2F1024%2Fbranded_news%2F139EF%2Fproduction%2F_128476308_gettyimages-1270749917.jpg&hash=329f38327690422f3373dbf52f4dc27f&return_error=1)
Caffeine levels in High Street coffee vary hugely, tests find
One espresso contained six times the caffeine found in one from another chain, research shows.
www.bbc.co.uk