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Caffeine (also known as 1,3,7-rimethylxanthine) is often described as ‘the most commonly used drug in the world.’ It is a stimulant found in a variety of food and drinks that affects the central nervous system and also has a wide variety of effects a..

Caffeine is classed as a drug as well as a nutrient: it is sometimes referred to as the most-consumed drug worldwide. It is used by many people to wake up, stay awake or improve alertness. Athletes often use it to improve endurance performance, but i..