Caffeine is a popular psychostimulant that acts as an adenosine receptor antagonist at physiological concentrations. It is the most widely used drug in history, consumed daily by more than 70% of New Zealanders in the form of coffee, tea, chocolate and caffeinated soft drinks. It has been estimated that adults aged between 20 and 64 years are exposed to an average of 3.5mg of caffeine/kg body weight/day¹.
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