How does it work?
Caffeine mainly affects the brain. It's absorbed in the small intestines within an hour, and becomes available throughout the blood and most parts of the body, including your brain. It functions by blocking the effects of adenosine, a neurotransmitter relaxing the brain and making people feel tired. And caffeine helps you keep awake by connecting to adenosine receptors in the brain without activating them to reduce tiredness. Besides, it may also increase brain activity of the neurotransmitters dopamine, which further stimulates the brain and promotes a state of concentration and effectiveness.
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