If you've been stockpiling serums since a faint second line showed up on a test, niacinamide has probably survived the cull. It's in half the skincare aisle, from budget serums to prestige moisturisers, and it's usually the one ingredient nobody warns you about. So is niacinamide safe during pregnancy, or is it hiding a catch like retinol did?
The Short Answer
Niacinamide is not currently flagged in PregSafe's ingredient database, meaning no safety concern has been identified based on current evidence. It has one of the most well-studied tolerability profiles of any skincare active, with no restrictions during pregnancy, when trying to conceive, or while breastfeeding.
Is Niacinamide Safe During Pregnancy? What the Evidence Shows
Niacinamide is the amide form of vitamin B3, a nutrient your body already needs and gets from food. Retinol is also a form of a vitamin your body needs, vitamin A, so the difference isn't that one is natural and the other synthetic. It comes down to dose and potency. Retinoic acid, what your skin converts retinoids into, is a known teratogen at high concentrations, and topical retinoid products are formulated to push well past what your body would encounter through diet alone. Niacinamide has no equivalent mechanism in the current research.
The most detailed safety review comes from the Cosmetic Ingredient Review (CIR) Expert Panel, which combined decades of toxicology and clinical data on the ingredient. Testing at concentrations up to 10% produced no stinging, use tests up to 5% produced no irritation, and a 21-day cumulative irritation test at 5% found niacinamide was neither a skin sensitiser nor a photosensitiser (1). A separate dermatology review found that topical niacinamide reduces transepidermal water loss and strengthens the skin barrier, which is part of why it turns up in so many moisturisers and sensitive-skin formulas in the first place (2).
None of this research is pregnancy-specific, which is worth being upfront about. Human clinical trials on niacinamide for pigmentation have generally used concentrations of 2 to 5% (3), and the CIR panel's human irritation and stinging testing went up to 10%. Some brands do sell higher-strength 20% formulas. The CIR panel's animal sensitisation testing did include a 20% challenge concentration, which produced no sensitisation, but there is less published human data at that strength than at 2 to 10% (1). There is no mechanism in the literature suggesting topical niacinamide crosses into systemic circulation in meaningful amounts at any of these concentrations.
Does TTC, Pregnancy, or Breastfeeding Change the Guidance?
Not for topical niacinamide. Unlike salicylic acid or benzoyl peroxide, which PregSafe rates as limit and ties to specific concentration caps, niacinamide carries no stage-specific caveats in the current evidence base, whether you're trying to conceive, pregnant, or breastfeeding.
The one distinction worth knowing is between skincare and supplements. Niacinamide is also the active form of niacin (vitamin B3) used in oral supplements, and the recommended intake actually increases during pregnancy, to 18mg NE a day, and stays elevated at 17mg NE a day while breastfeeding, according to the NIH's Office of Dietary Supplements. That's about food and prenatal vitamins, not serums, and it's a different conversation to whether your 10% niacinamide moisturiser is fine to keep using.
The Bottom Line
So is niacinamide safe during pregnancy? Based on the current evidence, it's not currently flagged by PregSafe and has one of the better-studied tolerability profiles of any skincare active, whether you're TTC, pregnant, or breastfeeding. It's a reasonable ingredient to keep in your routine, unlike retinoids, which PregSafe does flag as avoid across all three stages.
That said, "not currently flagged" describes the ingredient in isolation, not the dozen other ingredients sitting next to it on your bathroom shelf. That's why we built PregSafe: to check your actual products, not just the headline ingredient, against a toxicologist-reviewed database. Join our waitlist to be the first to try it.
PregSafe is not a replacement for medical advice. Always consult your healthcare provider for personalised guidance.
Sources (1) Andersen FA. Final report of the safety assessment of niacinamide and niacin. International Journal of Toxicology. 2005;24(Suppl 5):1-31.
(2) Gehring W. Nicotinic acid/niacinamide and the skin. Journal of Cosmetic Dermatology. 2004;3(2):88-93.
(3) Hakozaki T, Minwalla L, Zhuang J, et al. The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer. British Journal of Dermatology. 2002;147(1):20-31.
