"If you are buying pills online there's no guarantee you will get what's on the box. It is really the wild west," said a local doctor.
"I am now on medication for life due to those dangerous drinks," said Lee Kamen, a pub owner from Hull, in northern England.
Black tea, herbal teas and hot cacao are some alternative morning drinks to have in place of coffee.
If you're looking for a coffee to wake you up and slap you in the face, these strong, bold ones packed with caffeine are the ones to consider.
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Researchers tested a small sample of 18 batches of blood for drugs such as caffeine and Xanax. All tested positive for caffeine and the vast majority tested positive for Xanax.
"...the cravings can last weeks, months, and even years."
Friedlieb Ferdinand Runge was a German chemist who made a number of important discoveries, not least the isolation of caffeine in coffee.
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Scientists wanted to understand if coffee could be beneficial even in those whose bodies process it slowly.
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The agency says the product poses risk for overdose, and possibly death.
When brewing more than two cups rapidly, the machine oozes hot java.