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4. Heart Palpitations

Some doctors recommend niacin to help lower cholesterol levels and reduce the risk of cardiovascular disease, though recent studies have questioned its cardiovascular benefits. The vitamin may even be harmful in some cases. Some people experienced rapid heartbeat, heart palpitations, and irregular heart rhythms while taking niacin supplements. Research concerning niacin's cardiovascular effects is ongoing.

young woman experiencing heart palpitations or chest pain

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