The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
You also release adrenaline from your adrenals, again riding on top of your kidneys. Those are second system whereby your system gets flooded with adrenaline in pulses. So you can get one pulse, you can get 10 pulses. We'll talk about how to regulate the number of pulses and you release it from an area of your brain called locus coeruleus, and that creates alertness in your brain.
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In fact, there's a barrier between brain and body that prevents the epinephrine that's released from your adrenal glands, from crossing the blood brain barrier. So your brain has a separate site called the locus coeruleus. This is a collection of neurons in the back of the brain that kind of sprinkler the rest of the brain with epinephrine and essentially wakes up whatever neural circuits happen to see, or I should say, wake up any circuits where that epinephrine happens to arrive, right, and generally increase the excitability of those networks. That's why we say epinephrine increases energy.