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Is niacin safe during pregnancy?

Written by the Full Measure editorial team, which sells supplements. Approved for publication by the Full Measure owners. Updated .

Drafted with AI assistance from the sources listed below. How we write these

Quick answer

NIH's upper limit for niacin from supplements is 35 mg a day for adults and 30 mg for ages 14 to 18, including in pregnancy, and it does not count food. The label of a prescription niacin tablet says data are too limited to judge the risk of birth defects or miscarriage. Ask your doctor first.1,2,3

Key facts

  • NIH's upper limit for niacin from supplements and medicines is 35 mg a day for adults and 30 mg for ages 14 to 18, the same in pregnancy.1,2
  • The upper limit counts niacin from supplements and medicines only, and niacin that occurs naturally in food has not been reported to cause harm.1
  • The label of a prescription niacin tablet says its data on pregnant women are insufficient to evaluate a risk of major birth defects, miscarriage or other outcomes.3
  • The same label says to stop the tablet when pregnancy is recognized in patients taking it for high cholesterol.3
  • MedlinePlus says to tell your doctor if you are pregnant or plan to become pregnant, and to stop niacin and call your doctor if you become pregnant while taking it.4

What does NIH say about niacin in pregnancy?

NIH's fact sheets do not describe any pregnancy-specific harm from niacin at nutritional amounts. What they do give is an upper limit for niacin from supplements and medicines, listed in the same table for pregnancy as for other adults and teens: 35 mg a day at 19 and older and 30 mg at 14 to 18.1,2

The upper limit for niacin from supplements and medicines is 35 mg a day for adults, including during pregnancy and breastfeeding. It is 30 mg for ages 14 to 18, 20 mg at 9 to 13, 15 mg at 4 to 8 and 10 mg at 1 to 3. It is set at the level linked to flushing, covers both nicotinic acid and nicotinamide, does not count niacin in food, and does not apply to people taking niacin under medical supervision.1,2

The limit rests on flushing, the effect that appears at lower amounts than any other, and it covers both forms of niacin. It does not apply to people taking niacin under medical supervision, which is the case for prescription niacin.1

Does niacin in food matter in pregnancy?

NIH says niacin that occurs naturally in food has not been reported to cause harm, and that the upper limit counts niacin from supplements and medicines only. Food is therefore not the part of the picture that the limit is meant to control.1

Niacin that occurs naturally in food has not been reported to cause harm. The upper limit counts only niacin from supplements and medicines.1,2

What does a prescription niacin label say about pregnancy?

The prescription label is the most direct official statement. It says the potential for embryofetal toxicity at the doses in the tablets is unknown, that the data on pregnant women are insufficient to evaluate a drug-associated risk of major birth defects, miscarriage or adverse maternal or fetal outcomes, and that animal reproduction studies have not been done with niacin.3

It also says to discontinue the tablets when pregnancy is recognized in patients taking them for high cholesterol, and to assess the individual risks and benefits in patients taking them for very high triglycerides. It adds that treating high cholesterol is not generally necessary during pregnancy, and that stopping lipid-lowering drugs during pregnancy should have little impact on long-term therapy for most patients.3

MedlinePlus's page on niacin medicine says the same in plain words: tell your doctor if you are pregnant, plan to become pregnant or are breastfeeding, and if you become pregnant while taking niacin, stop and call your doctor.4

What do the sources not cover?

The sources checked do not report trials of niacin supplements in pregnant women, and they do not address nicotinic acid and nicotinamide separately for pregnancy. They also say nothing about skin-care products that contain niacinamide. That is not a finding either way, so ask a doctor or pharmacist about any product that is not covered here.1,2,3

Who should ask a doctor before taking niacin in pregnancy?

  • Anyone who takes prescription niacin and is pregnant or planning a pregnancy, since the label says to reassess it when pregnancy is recognized.3,4
  • Anyone who takes a niacin supplement beside a prenatal vitamin, a B complex or fortified foods, to add up the total against the upper limit.1
  • Anyone with liver disease, a stomach ulcer, gout, diabetes or a bleeding problem, which MedlinePlus lists as conditions to mention to a doctor before niacin medicine.4
  • Anyone who takes a statin, a blood thinner or a blood pressure medicine.1,3

Questions people ask

Is niacin bad for pregnancy?

The sources checked do not report harm from niacin at nutritional amounts in pregnancy. The label of a prescription niacin tablet says data are insufficient to judge risk and advises stopping it for high cholesterol when pregnancy is recognized. Ask your doctor.1,3

Is niacin in food safe during pregnancy?

NIH says niacin that occurs naturally in food has not been reported to cause harm, and the upper limit counts only supplements and medicines.1

Is nicotinic acid safe in pregnancy?

Nicotinic acid is the form that causes flushing, and NIH's upper limit of 35 mg a day for adults covers both forms, including in pregnancy. The prescription label says data in pregnant women are insufficient. Ask your doctor.1,3

Is niacin safe for pregnancy at the upper limit?

NIH's upper limit is 35 mg a day for adults and 30 mg for ages 14 to 18 from supplements and medicines, set at the level linked to flushing. It does not say that amount is advised in pregnancy. Ask your doctor.1,2

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Sources

  1. National Institutes of Health, Office of Dietary Supplements. Niacin: Fact Sheet for Health Professionals. Updated November 18, 2022. Opened 2026-10-07.
  2. National Institutes of Health, Office of Dietary Supplements. Niacin: Fact Sheet for Consumers. Updated March 22, 2021. Opened 2026-10-07.
  3. Niacin extended-release tablets: prescribing information and patient information (Amneal Pharmaceuticals). DailyMed, U.S. National Library of Medicine. Published September 18, 2026. Opened 2026-10-07.
  4. MedlinePlus, U.S. National Library of Medicine. Niacin: drug information (American Society of Health-System Pharmacists). Last revised April 15, 2026. Opened 2026-10-07.

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.