noun
a type of vitamin B3 that is essential for the body's metabolism and overall health
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Niacin, also known as vitamin B3, is essential for the body's metabolism.
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If you're feeling tired all the time, you might need to up your niacin intake.
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I heard niacin is good for boosting your energy levels.
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Adding niacin to your diet is like giving your body a little extra fuel to keep going.