Found in caffeinated beverages, caffeine may relieve fatigue and provide energy boosts.

Certain plants contain caffeine although it can be made as well. It absorbed rapidly to the brain and is excreted through the urine hours after being consumed. Caffeine is not required in the diet but many consume caffeinated food products to relieve fatigue and to provide an energy boost. It is found naturally in tea leaves, kola nuts, coffee, and cocoa beans.

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