+Caffeine is a natural [stimulant](/wiki/stimulant) primarily found in coffee, tea, and cacao plants. It acts on the [nervous system](/wiki/nervous_system) to reduce fatigue and enhance alertness, making it one of the world's most widely consumed psychoactive substances.
+## See also
+- [Coffee](/wiki/coffee)
+- [Tea](/wiki/tea)
+- [Energy Drink](/wiki/energy_drink)
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