Are there any side effects of vitamin B3?

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Vitamin B3, also known as niacin, commonly causes side effects such as feeling flushed, itching or redness of the skin. Alcohol and hot drinks may increase these side effects. To reduce flushing reactions, try taking this medicine with a cool drink. You may also feel dizzy when taking vitamin B3, or it may cause an allergic reaction. Some people may notice that vitamin B3 causes insomnia. But such side effects of vitamin B3 may fade as you consume it on a regular basis.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.