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A cool fact about epinephrine (also known as adrenaline) is that it’s your body’s emergency “fight-or-flight” hormone. When you’re faced with a threat or stress, your adrenal glands release epinephrine, which increases your heart rate, boosts blood flow to muscles, and sharpens your focus, essentially preparing you to react instantly. Interestingly, it’s also used medically to treat life-threatening allergic reactions (anaphylaxis) because it can quickly open airways and raise blood pressure.