Is niacinamide safe during pregnancy?

No study has tested niacinamide skin care in people who are pregnant, so no one can say for certain that it is safe in pregnancy. Many websites answer yes anyway. What is actually known is narrower: niacinamide is a form of vitamin B3, it tested gentle in skin studies, and it is absent from the American Academy of Dermatology's list of acne ingredients to avoid in pregnancy. This Skinli guide sets out that evidence, says plainly what is missing, and explains what you can do with what is known. For the overview of the ingredient, see what niacinamide does for your skin.

The short answer

No study listed on PubMed has tested niacinamide skin care in pregnant people. Several facts point toward low risk, and none of them replaces a pregnancy study:

• Niacinamide is a form of vitamin B3, a nutrient the body needs, and needs more of in pregnancy.
• Safety tests found niacinamide gentle on skin.
• The American Academy of Dermatology's page on acne treatment during pregnancy does not list niacinamide among treatments to stop. It does not mention niacinamide at all.

The decision belongs to you and your prenatal care provider. Bring the product, or a photo of its ingredient list, to your next visit.

Why there are no pregnancy studies

The American Academy of Dermatology explains the gap for all acne treatments: "Researchers don't give pregnant women medications, so there are no studies to tell us what happens when pregnant women use a treatment." What doctors know comes from animal studies and from people who used a treatment while pregnant.

For well-known medicines, that past use adds up to useful data. Niacinamide skin care is sold as a cosmetic, and PubMed, the U.S. National Library of Medicine's index of medical research, lists no study of niacinamide skin products in pregnant people. That is a real gap in the evidence, and guesses cannot fill it.

What the safety data does show

The main safety report on niacinamide is from the Cosmetic Ingredient Review panel, published in 2005. It found:

Finding	What it means for pregnancy
No irritation up to 5 percent and no stinging up to 10 percent in human skin tests	Gentle on skin
Not an allergen and did not cause reactions to light in its tests	Low chance of a skin reaction
"Readily absorbed from skin"	Some niacinamide reaches the body, so skin use is not fully separate from the rest of the body
Judged safe as used in cosmetics	The panel's conclusion, for the general public, without a pregnancy study

The absorption finding is the reason the pregnancy question is fair to ask, and the reason to decide with your provider.

Vitamin B3 in pregnancy

Niacin and niacinamide are both forms of vitamin B3. MedlinePlus, from the U.S. National Library of Medicine, gives the daily amount women need:

Group	Niacin per day
Females age 14 and older	14 milligrams
During pregnancy	18 milligrams
During breastfeeding	17 milligrams

This shows that vitamin B3 itself is a normal, needed nutrient in pregnancy. It says nothing about how much reaches the body from a serum, and it gives no safe limit for skin products. Most of your daily need comes from food and your prenatal vitamin.

Niacinamide pills are a separate question

Niacinamide pills, often labeled nicotinamide, deliver far more vitamin B3 than skin care. Trials of nicotinamide pills for skin cancer used 500 milligrams twice a day, which is many times the daily need above, and they enrolled adults with a history of skin cancer. A 2022 review of 29 trials linked nicotinamide pills to more stomach side effects. MedlinePlus says too much niacin can cause high blood sugar, liver damage, stomach ulcers and skin rashes.

Do not take niacinamide or any vitamin B3 pill during pregnancy unless your prenatal care provider advises it. The niacinamide vs niacin guide explains how the pills differ from skin care. Your prenatal vitamin already contains vitamin B3.

How niacinamide compares with other acne and skin ingredients

The American Academy of Dermatology gives clearer guidance for other ingredients:

Ingredient	What the AAD says about pregnancy
Isotretinoin, tazarotene, spironolactone	Stop at once; "These medications can cause serious birth defects"
Adapalene	"Most experts recommend stopping this treatment during pregnancy"
Retinol and retinyl palmitate	"If you're pregnant or breastfeeding, you shouldn't use a product containing retinol or retinyl palmitate"
Azelaic acid	"This is thought to be safe to use during pregnancy"
Benzoyl peroxide	"Experts say it's safe to use in limited amounts"; talk with your obstetrician or dermatologist first
Salicylic acid	"Generally considered safe when used for a limited time"; talk with your obstetrician or dermatologist first
Niacinamide	Not mentioned

The retinoid rules are the ones with firm warnings. The adapalene label also says to ask a doctor before use if pregnant or breastfeeding. The retinoids during pregnancy and breastfeeding guide covers those in detail.

Breastfeeding

The evidence for niacinamide while breastfeeding is also limited. No study listed on PubMed has measured niacinamide from skin products in breast milk.

One expert source gives an opinion. In a 2026 consensus study from Egypt, published in Dermatology and Therapy, 16 expert dermatologists rated skin care ingredients for a breastfeeding mother with pigment problems. They rated sunscreen and pigment ingredients, including niacinamide, as appropriate, and rated classic retinoids inappropriate "during breastfeeding because of safety/irritation concerns." This is expert opinion from one country. It supports niacinamide as a reasonable choice while breastfeeding, and it is still no substitute for a study.

If you use niacinamide while breastfeeding, keep it off the chest and any skin your baby's mouth touches, and tell your provider.

Why answers online disagree

Websites that call niacinamide pregnancy safe give reasons such as these: it is a form of vitamin B3, it is gentle, and it carries no known warning. Those facts are real. The step from "no known warning" to "proven safe" is the part that has no study behind it. This Skinli page keeps the two apart, because a pregnancy decision deserves to rest on what is known, with the unknowns named.

Reading the label during pregnancy

The niacinamide in a product is rarely the only active ingredient. Many serums and creams combine it with other ingredients, and some of those do carry pregnancy warnings. Before you use a niacinamide product while pregnant or breastfeeding, read the full ingredient list and look for:

• Retinol and retinyl palmitate, which the American Academy of Dermatology says not to use while pregnant or breastfeeding.
• Adapalene, which most experts recommend stopping in pregnancy, per the AAD.
• Salicylic acid, which the AAD calls generally safe for a limited time, after a talk with your obstetrician or dermatologist.
• Fragrance and many plant extracts, which add more unknowns and more chances of a skin reaction.

A product with niacinamide and a short list of plain moisturizing ingredients keeps the number of unknowns lowest.

Questions to take to your prenatal care provider

A short visit goes further with specific questions. Consider asking:

1. Is it fine for me to use a 2 to 5 percent niacinamide product on my face during this pregnancy?
2. Are any of the other ingredients in this product a concern?
3. Which acne treatments can I use if my acne gets worse?
4. Should I change anything in my skin care while breastfeeding?
5. Is my prenatal vitamin enough vitamin B3, or do I need anything else?

Write the answers down, since skin care questions often come up again later in pregnancy.

If you want to use niacinamide while pregnant

After talking with your provider, these steps keep the unknowns small:

1. Choose one simple product with 2 to 5 percent niacinamide, the strengths used in trials.
2. Avoid combination products that also hold retinol, retinyl palmitate or other retinoids.
3. Patch test on the underside of the arm for 7 to 10 days. The steps are in how to patch test a new skincare product.
4. Use it once a day at first.
5. Wear sunscreen daily, SPF 30 or higher.
6. Stop if you get a rash, burning or itching.

If acne flares in pregnancy, see your provider or a dermatologist. The AAD says that if you want to treat acne during pregnancy, it helps to get expert advice from your obstetrician or a dermatologist before using any acne treatment. The adult acne guide has a section on acne during pregnancy.

When to see a doctor

See your prenatal care provider before starting any new skin product you are unsure about, and at once for a rash with swelling, blisters or trouble breathing. See a dermatologist for acne that is painful, spreading or leaving marks during pregnancy. Never stop a prescribed medicine on your own. Call the doctor who prescribed it and tell them you are pregnant.