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Caffeine is a central nervous system stimulant belonging to the methylxanthine class and is the world’s most widely consumed psychoactive substance. It is legally available in most countries and commonly found in beverages such as coffee, tea, and soft drinks.
Its primary mechanism of action involves blocking adenosine receptors, reducing drowsiness and promoting alertness. Caffeine also influences the autonomic nervous system, contributing to increased wakefulness and cognitive performance.
Naturally occurring in plants such as coffee beans, tea leaves, and cocoa, caffeine serves as a natural protective compound. It is widely consumed globally for its stimulatory effects and ability to temporarily enhance focus and reduce fatigue.