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Caffeine stimulates the CNS by increasing certain neurotransmitters such as dopamine, acetylcholine and even serotonin. These neurotransmitters have profound effects on the way you feel. It’s important to note that an increase of these neurotransmitters lead one to be very alert and active. Caffeine can cross the blood brain barrier so it can even stimulate your brain to make you more active. Usually you’ll start feeling the effects within 45 minutes of drinking a cup of coffee."

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