20 January 2014
by Catherine Saxelby
A. Energy drinks are really soft drinks with caffeine whether it's added or derived from guarana, the seeds of a climbing vine native to South America. Or both. The level of caffeine is generally around 80 mg per 250ml can, which is around twice what you'd get from a 375 ml can of cola soft drink (which has always contained a small amount of caffeine) and roughly equal to a cup of brewed coffee.
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