What it does
Niacinamide is the closest thing skincare has to a default active. It supports the production of ceramides in the skin barrier, which is why it tends to reduce redness and reactivity rather than provoke it, and it has a well-documented effect on uneven tone and post-inflammatory marks over a couple of months.
It also has a modest effect on how oily skin reads through the day, which is why it shows up in so many products aimed at combination and oily skin. That effect is real but gradual — it is not a mattifying primer, and expecting same-day shine control is the usual reason people conclude it "did nothing".
Because it is water-soluble and stable, it sits comfortably in almost any step of a routine and layers with almost anything. If you are building a first routine and want one active that is unlikely to cause a setback, this is the sensible pick.
In a routine
Layers well with
- Hyaluronic acid
- Ceramides
- Retinol
- Zinc oxide
