Niacinamide is the active ingredient you are most likely to own without knowing it. It sits in a lot of things - a 5% ampoule, a barrier cream, a sunscreen - and it has been studied more than almost any other skincare active. It is also, unfairly, one of the most misunderstood. People expect it to do what retinol does, and then they conclude it does not work.
What niacinamide actually does
- Regulates oil. It reduces the rate your sebaceous glands produce oil, which is why it shows up in products aimed at oily and combination skin.
- Fades dark spots. It interferes with the transfer of pigment between skin cells, so existing marks fade gradually over weeks to months.
- Strengthens the barrier. It increases the skin's own production of ceramide, which is the waxy layer that keeps water in.
- Calms redness. It reduces the inflammatory signalling that makes skin look flushed, which is why it pairs well with retinoids and acids.
- Supports the look of firmness, modestly. The evidence is real but gentler than retinol.
That is a genuinely useful list. What it does not do is resurface deeper texture, dissolve a congested pore overnight, or rebuild a damaged barrier in one application. Niacinamide is a slow, steady, unglamorous ingredient, and that is exactly why it works.
What 5% means, and why it matters
Niacinamide is available from 2% to 20%. The 5% figure is not marketing - it is where the balance sits between efficacy and irritation. Below 2% you are unlikely to see much. Above 10% you gain little and increase the chance of a stinging reaction, especially on dry or sensitive skin.
If you are buying a product for the first time, 5% is the right target. It is also the concentration in our rice exfoliant ampoule with 5% niacinamide, which pairs it with rice water for gentle exfoliation - so you get the brightening effect without a routine that needs a two-week acclimatisation period.
How to use it
- Apply to damp skin, before your heavier creams. It absorbs faster and layers better.
- Use it morning and night. Niacinamide is one of the few actives that genuinely works twice daily.
- Layer it under sunscreen. It will not replace SPF, but it will not fight it either.
- Give it 8-12 weeks. Dark spots fade over months, not weeks.
If you are adding niacinamide to an existing routine, the order of operations matters more than the ingredient itself. Our facial skincare collection guide sets out the order, and the short version is: thinnest to thickest, actives before occlusives, SPF last in the morning.
Can you use niacinamide with retinol and vitamin C?
Yes. This is the most persistent skincare myth. Niacinamide is compatible with retinol, vitamin C, salicylic acid and hyaluronic acid. Some people report that niacinamide stings when layered with vitamin C, and the fix is not to separate them - it is to use a lower percentage of vitamin C, or to use ascorbyl glucoside, which is a gentler derivative. It also helps that niacinamide is mildly acidic, so it will not neutralise an ascorbic acid formula the way a high-pH product might.
Who should not use it
- Anyone with a known niacinamide sensitivity - uncommon, but it presents as persistent redness and burning.
- People using it as a replacement for a retinoid. They are different tools for different problems.
If you are pregnant, niacinamide is generally considered one of the more comfortable actives, but the full formula still matters. Check the rest of the ingredient list rather than assuming one active makes a product safe.
Frequently asked questions
Does niacinamide cause purging?
No. Purging is a concept specific to retinoids and benzoyl peroxide, where a faster cell turnover temporarily clogs pores. Niacinamide does not increase cell turnover, and any bumps you notice are unrelated to it. Stop using it and reassess if you are breaking out.
How long does niacinamide take to work?
Oil regulation usually shows in 2-4 weeks. Redness and barrier improvements are noticeable in 1-2 weeks. Dark spot fading takes 8-12 weeks, sometimes longer, and it depends on how deeply pigmented the mark is.
Can I use niacinamide every day?
Yes, twice a day if you want. It is one of the few actives that does not need a rest day, and it does not cause tolerance.
Is 10% niacinamide better than 5%?
Marginally, and at the cost of a higher chance of irritation. The extra 5% is not worth stinging.
Does niacinamide lighten skin?
It fades marks and evens tone, but it is not a lightening active in the way hydroquinone or azelaic acid are. If you have genuine hyperpigmentation, azelaic acid is a better place to look.
If you are comparing actives, our 8D hyaluronic acid serum with copper peptide is a good counter-example - it handles hydration and antioxidant defence, which are different jobs from niacinamide, and the two layer well together.