Niacinamide is a form of vitamin B3. Korea's Ministry of Food and Drug Safety lists it as one of nine notified brightening actives, and beyond that claim it turns up in products aimed at pores, the skin barrier, oil and fine lines. Reports of irritation are rare, it does not fuss about skin type and it layers easily with other actives, which is why people reach for it first.
The short version The notified range for a brightening claim is 2 to 5 percent. A product using that much has to print niacinamide near the top of its ingredient list, so the position alone tells you something. It is fine to use with vitamin C, and the old flushing scare has little to do with the strengths people actually apply.
| On the label | Niacinamide (나이아신아마이드 in Korea) |
|---|---|
| Also known as | Vitamin B3, Nicotinamide |
| Family | B-vitamin complex |
| Functional claim | Notified brightening active · 2 to 5% (Annex 4) |
| EWG rating | 1 |
| Pregnancy & breastfeeding | Generally considered usable (check with your doctor) |
| Photosensitivity | None (use day or night) |
| Key benefits | Brightening, pores, barrier repair, oil control, anti-aging |
| In our database | 894 of 2,086 products · usually 6th (July 2026) |
Melanin forms deep in the skin and slowly works its way up to the surface. That is where it shows as a dark spot. Niacinamide gets in the way of that journey. Rather than bleaching out pigment that has already settled, it holds back the pigment still on its way up. The change is gradual rather than instant. You will not see much overnight, but a month or three of steady use lets spots fade and the overall tone even out.
It works on pores from two angles. It eases off how much oil the skin produces and firms the skin around each opening so the pore reads as tighter. The difference shows up most on the larger pores around the nose and cheeks.
Niacinamide nudges the skin to make more of its own barrier lipids. Those lipids are the ceramides that hold the surface together, and topping them up helps mend a barrier that has worn thin. On dry or easily irritated skin that means less water loss and a little more resilience against daily stress.
It keeps excess oil in check and quietly calms low-grade inflammation, and together those take some heat out of breakouts. It is not as aggressive as salicylic acid. That is part of the appeal, because you can use it day after day without the irritation.
It supports collagen production in the background and mops up the free radicals (oxidative stress) that push skin toward aging. It is far gentler than retinol, so it makes a sensible first step into anti-aging for beginners and for anyone whose skin reacts easily.
Once it is absorbed, niacinamide converts into a molecule called NAD+ that cells lean on to make energy and repair themselves. Think of it as topping up your skin cells' baseline fitness. The more they keep in reserve, the faster they recover from damage and the steadier they hold up against oxidation.
Your skin's outer layer seals in moisture and keeps irritants out, and ceramide is the mortar that holds that wall together. Niacinamide coaxes the skin into making more of that ceramide on its own. That is what sets it apart from products that simply spread ceramides on top. Here the skin does the work itself.
A brightening claim has to sit inside 2 to 5 percent, so that is where most products land. Higher-strength formulas like The Ordinary's 10% + Zinc go past the notified range, and we have no grounds to say the extra strength buys extra results. Some people flush temporarily, so drop back down if your skin objects.
Front-of-bottle names and ingredient lists rarely match. Niacinamide is the exception. Of the 894 products we counted, 831 spell it 나이아신아마이드 on Korean labels and 76 print the English Niacinamide, so the name you saw on the front is the name you will find on the back. Ceramide behaves differently, turning into 세라마이드엔피 once you flip the bottle over.
One name does trip people up. Nicotinamide adenine dinucleotide and nicotinamide mononucleotide are separate raw materials that contain niacinamide inside them. They read like the same thing, but the ingredient on the notified brightening list is niacinamide itself.
The MFDS names nine ingredients a product may use to claim it helps brighten skin. Niacinamide is seventh, at 2 to 5 percent. Arbutin, mulberry extract, ascorbyl glucoside and alpha-bisabolol sit on the same list (Regulation on Functional Cosmetics Review, Annex 4).
That number is how you read a label. Ingredients run in order of amount, and only those at or below 1 percent may be listed freely, so a formula using 2 to 5 percent has to place niacinamide above the 1 percent line. Find it buried near the end and the amount is unlikely to carry a brightening claim.
The rules also limit the format. A brightening claim is only granted to lotions, liquids, creams, solids and sheet masks. Niacinamide in a rinse-off cleanser is not sitting in a spot the MFDS reviews for brightening.
Many formulas add adenosine, which is a notified wrinkle-care active. It appeared in 612 of our 894, so pairing the two to carry both claims at once is common in Korea.
We collected 2,086 full ingredient lists and found niacinamide in 894 of them. More than four in ten. In Korean skincare it is closer to a default than a specialty.
The position is the interesting part. It usually appears 6th, and 773 products (85%) place it within the first ten. Ceramide, by comparison, usually turns up 34th. A notified range of 2 to 5 percent has to show up near the top, and the data agrees.
The earliest we saw was 2nd and the latest 124th. For the 51 products that list it past 20th, the amount is unlikely to match the notified range. Position hints at a small amount and nothing more precise than that.
Company it keeps: glycerin in 887 (97%), hyaluronic acid and adenosine in 612 each (67%), tocopherol in 525 (58%) and panthenol in 478 (53%).
Pick a product
We read the labels, not the marketing
Full list of 124 on the same page.
Niacinamide is one of the safest actives around and real side effects are uncommon. The few that come up now and then:
It plays nicely with nearly every other active. Retinol, AHAs and vitamin C all sit happily alongside it. That easygoing streak is what makes it such a good place for a beginner to start.
You might have heard that vitamin C and niacinamide turn irritating once you mix them. That story traces back to a 1960s lab test run under high heat. It has nothing to do with how the two behave in a real routine. The myth was put to rest long ago, so go ahead and layer them together.
More ingredient guides
VERIFIED DUPES
Verified dupe pairs featuring Niacinamide: 100
Pairs confirmed by comparing both full ingredient lists.
The information on this page is written for general cosmetic-ingredient education. It does not replace medical diagnosis, prescription, or treatment.
If you notice an adverse reaction, stop using the product immediately and see a professional.
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