Niacinamide: What It Does and Which Skin Types It Suits

Niacinamide is one of the most broadly useful ingredients in skincare — genuinely well-studied and well-tolerated across most skin types. It is a form of vitamin B3, and it turns up in everything from budget serums to premium moisturisers for good reason. This guide covers what the evidence points to, how it fits into a routine, and where it tends to make a visible difference.

What does niacinamide actually do?

The honest answer is that it does several things reasonably well rather than one thing exceptionally, which is part of why it has become such a staple. Research most consistently associates it with a more refined-looking skin surface, a less shiny appearance, a more even-looking skin tone, and support for the skin's moisture barrier.

For skin that tends to look oily or congested, niacinamide is associated with a more balanced, less shiny complexion over time. For skin that looks uneven or dull, it is linked with a brighter, more even-looking tone. For skin that feels reactive or looks red, its soothing reputation makes it one of the more reliable options among cosmetic actives. Niacinamide reached dermatologist consensus for redness and dark spots in the JAAD 2025 Delphi study, a two-round expert review completed by 62 dermatologists across 43 centres that assessed the evidence behind hundreds of candidate skincare ingredients.

What makes it particularly useful is that these benefits are not mutually exclusive. A serum built around niacinamide suits oily skin, sensitive skin, and skin concerned with uneven tone — often at the same time.

Is niacinamide right for your skin type?

It suits most skin types, which is unusual for an active ingredient. For oily and combination skin, its association with a less shiny, more refined-looking surface makes it one of the more targeted cosmetic options available. For sensitive skin, it is gentle enough to use daily and unlikely to cause the adjustment reactions that stronger actives can. For dry skin, it supports the moisture barrier in a way that complements ceramides and hyaluronic acid rather than competing with them.

The one group that occasionally finds niacinamide less straightforward is skin already using a high concentration of vitamin C. The two are compatible, but some people find that very high concentrations of both together cause temporary flushing. Starting at a lower concentration and building up resolves this for most people.

What concentration is worth looking for?

Niacinamide typically appears in skincare at concentrations between 2% and 10%. The research does not point to a clear "more is better" relationship. A well-formulated product at 5% will often outperform a poorly formulated one at 10%, because the surrounding formula affects how an ingredient behaves on the skin. A concentration in the 4 to 5% range is a sensible starting point for most skin types.

How does it fit into a routine?

Niacinamide works well at almost any point in a routine, which makes it easier to layer than many actives. As a serum it is applied after cleansing and before moisturiser. It can be used morning or evening, or both. Unlike some actives, it does not increase photosensitivity, so it does not require the same precautions as retinol or exfoliating acids.

It pairs easily with most other ingredients. The questions that come up most often — including whether it can be combined with vitamin C or retinol — are addressed in related articles in this series.

Where Dewi comes in

Because niacinamide appears across so many product types and price points, narrowing down which formula suits your skin profile is where a scored recommendation adds something a general list cannot. Dewi scores the options against your individual profile, so the output reflects what is in the formula and how well it matches your skin, rather than what is trending.