If you have watched a few skincare videos, someone has certainly told you about niacinamide. It is one of the most recommended actives and, like anything that goes viral, it is now credited with more powers than it has.
Here is the honest sort-out.
In short
Niacinamide is a form of vitamin B3: water-soluble, stable and well tolerated by most skin. Used regularly, it tends to regulate shine, refine the appearance of pores and support skin comfort. Its effects are gradual and are judged over six to eight weeks; it replaces neither an exfoliant nor sun protection.
What is it, exactly?
Niacinamide is a water-soluble form of vitamin B3. Three things make it deservedly popular: it is stable (it doesn’t degrade in light the way some actives do), well tolerated by most skin, and easy to formulate, hence its presence in a huge number of products, from the specialist serum to the supermarket cream.
That is also why it is a good first active when you are starting out: no difficult adjustment period, no particular sun precautions.
What it does, to how skin looks
Used regularly, niacinamide tends to:
- smooth skin texture and soften the appearance of pores;
- regulate shine through the day;
- even out the complexion, notably the appearance of marks left by blemishes, which makes it one of the key actives for the marks that show up after the summer;
- improve the comfort of skin that feels tight, by supporting the skin barrier.
The important word in each line: tends to. The effects are real but gradual: you judge them over six to eight weeks, like any active, never over three days.
What it doesn’t do
- It doesn’t replace an exfoliant: it refines the appearance of texture, it doesn’t clear anything out. For that, you need an AHA or a BHA.
- It doesn’t erase old or indented marks: no cosmetic does.
- A higher percentage is not a better product. Past a certain point, raising the concentration mainly increases the risk of stinging, not the visible results. A well-formulated product at a moderate concentration is worth more than a race for percentages on the label.
- It doesn’t work miracles on an incoherent routine. An active is added to a base that works (gentle cleansing, hydration, protection), not in its place.
How to introduce it without a slip
Like any new product: gradually, and one at a time. Two applications in the first week, every other day after that, then daily if your skin keeps up. It goes at the serum step, morning or evening: both work.
Good news for busy routines: niacinamide gets on with most other actives, including retinol and vitamin C in modern formulations. The old rumour of incompatibility with vitamin C rests on laboratory conditions that look nothing like a bathroom.
And if you are building your routine around four products, as recommended in the minimalist routine, niacinamide is an excellent candidate for the single serum slot: versatile, tolerant, no constraints.
The last word
If stinging appears and persists beyond the first applications, it is not a “purging phase”: it is a sign that the product or the concentration doesn’t suit your skin. You space it out, reduce it, or stop. And if the discomfort continues regardless, the opinion that counts is a dermatologist’s, not a video’s.
Frequently asked questions
What does niacinamide do for the skin?
It tends to regulate shine, smooth skin texture and support the skin barrier. The review published in 2026 in Skin Health and Disease describes a reduction in sebum production and support for the barrier (ceramides, hydration), with a level of evidence still judged low to moderate.
Can you combine niacinamide and retinol?
Yes, niacinamide gets on with most actives. Just introduce the two at different times: the American Academy of Dermatology points out that using several new products at once can irritate the skin.
How long before you see an effect?
Allow six to eight weeks of regular use. According to the American Academy of Dermatology, most products need at least six weeks, sometimes up to three months.
Can niacinamide sting?
Yes, for some people, especially at a high concentration. The review cited mentions minor side effects (itching, a burning sensation). If it keeps stinging, you space it out, reduce it or stop.