Topical niacinamide is widely regarded as safe to use during pregnancy. It is a form of vitamin B3, and dermatologists often suggest it as a gentle stand-in for actives that are restricted in pregnancy, like retinoids. This reflects guidance and general consensus from dermatology and obstetric sources, though your own provider knows your situation best.
Niacinamide (also called nicotinamide) is a form of vitamin B3. In skincare it is used to calm redness, support the skin barrier, reduce oil, and help with dark patches like melasma. It usually appears in serums and moisturisers at concentrations of roughly 2 to 10 percent. Vitamin B3 is also a normal part of the diet, so the body is used to handling it.
Major bodies have not flagged niacinamide as an ingredient to avoid. The American College of Obstetricians and Gynecologists (ACOG) does not list it among skincare actives to steer clear of in pregnancy, and it is commonly grouped with low-risk ingredients like hyaluronic acid and glycerin. Applied to the skin, very little is absorbed into the body, and any trace exposure is small next to the amount of B3 people already get from food. There is no evidence linking topical use to harm in pregnancy.
Use niacinamide as directed on the product rather than in unusually high amounts, and patch test if your skin is sensitive, since pregnancy can change how skin reacts. Be aware it is often combined in the same product with other actives, some of which (like retinol or high-strength salicylic acid) are the ones usually restricted in pregnancy, so check the full ingredient list. If you prefer alternatives, hyaluronic acid, glycerin, and gentle vitamin C are also generally considered pregnancy-friendly.