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How long does a niacin flush last?

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Niacin flush is caused when the capillaries become dilated and blood flow increases causing a warming sensation and reddening of the skin. This typically occurs within 20 to 30 minutes after niacin has been taken and usually only lasts a few minutes. read more

There are 2 theories of thought as to why we flush or not, and they are actually the exact opposite of each other. 1. If you do not flush, then you are deficient and require a higher dosage. 2. If you do not flush then you have plenty of niacin in your system. read more

Flush due to extended release niacin generally lasts for hours. Some physicians recommend aspirin or another nsaid (if you tolerate them) 30 minutes prior to taking fast-acting niacin. In this case, taking them a few hours after the extended release niacin may work better. read more

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