Ingredient

Niacinamide

A form of vitamin B3 that calms redness and repairs the barrier. A supporting ingredient for acne, not a treatment on its own.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed August 23, 2026
Six niacinamide products on white, including The Ordinary 10% + Zinc 1%, Paula's Choice Booster and EltaMD UV Clear

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Niacinamide is the most useful ingredient in acne care that will not clear your acne. What it does is make everything else survivable — it rebuilds the barrier benzoyl peroxide and retinoids strip, takes the heat out of inflamed spots, and fades the brown marks left behind. People who stay on their acne treatment long enough for it to work are very often the ones using niacinamide alongside it. It is oversold as a pore shrinker; pores look less obvious when the skin around them is calmer, but nothing changes their size.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

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Also calledNicotinamide, vitamin B3, vitamin PP
TypeVitamin derivative, barrier support and anti-inflammatory
Strengths sold2% to 10%
UseMorning, night, or both
Time to work4 to 8 weeks
Prescription neededNo

What It Is

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Niacinamide is a form of vitamin B3, found in meat, fish, eggs and grains. It is the form used in skincare because it is stable and does not cause the flushing plain niacin does. It is regulated as a cosmetic, not a drug, so products need not state the concentration. Most that do fall between 2% and 10%. It appears in serums, moisturizers, sunscreens and cleansers, usually one ingredient among many rather than the headline.

How It Works

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Niacinamide feeds into the pathways skin cells use to make ceramides and the other fats that hold the barrier together. A stronger barrier holds water in and keeps irritants out, which is why it reduces the dryness and stinging acne treatments cause. It also dampens inflammatory signaling, so angry spots settle faster and redness eases. On pigment, it blocks the transfer of melanin from pigment cells to surface cells, fading the marks acne leaves.

There is direct evidence in acne too. A small study found 4% niacinamide gel performed comparably to 1% clindamycin gel over eight weeks. One small trial does not make it a replacement for a proper acne treatment.

The oil claim is where people go wrong. Some studies show less sebum at 2% to 4%, others little change. It is not a reliable way to control oily skin.

Acne treatments do not all do the same thing. Here is where Niacinamide acts, and what the others do instead.

Pick a treatment
Skin basics
POREEPIDERMISMELANOCYTESDERMISOILGLANDBACTERIACOLLAGENKILLS BACTERIAUNCLOGS THE PORESPEEDS UP CELL TURNOVERSTOPS PIGMENT MOVING UPUNCLOGS THE POREBUILDS COLLAGENFADES DARK SPOTSUNCLOGS THE POREKILLS BACTERIALOWERS OILFADES DARK SPOTSKILLS BACTERIALOWERS OIL PRODUCTIONSHRINKS THE OIL GLANDUNCLOGS THE POREEPIDERMISMELANOCYTESTHE POREOIL GLANDBACTERIACOLLAGENTHE DERMIS

Benzoyl peroxide releases oxygen inside the pore, and the bacteria involved in inflamed acne cannot live in it. It is the fastest of these on red, sore spots, and the one thing that stops acne bacteria becoming resistant to antibiotics.

Salicylic acid dissolves in oil, so it gets down inside the pore rather than sitting on the surface, and loosens the plug of dead skin and sebum blocking the way out. That suits blackheads and whiteheads more than deep, sore spots.

Retinoids change how the pore lining sheds, so plugs stop forming in the first place — which is why they prevent spots rather than treat the ones already there. Given months they also slow pigment reaching the surface and push fibroblasts to build collagen.

Azelaic acid does three things at once: loosens the plug in the pore, reduces the bacteria in it, and calms the pigment cells that leave a dark mark behind. That combination makes it useful on deeper skin tones, where the mark often outlasts the spot.

Niacinamide turns oil production down a little and interrupts pigment being handed to the cells above. The evidence for clearing spots is thin; it earns its place for the marks left behind, and for making stronger actives easier to tolerate.

Clindamycin is an antibiotic that quiets the bacteria in an inflamed pore. Used on its own it stops working within months as they adapt, so it is always paired with benzoyl peroxide or a retinoid.

Spironolactone blocks the hormone signal telling oil glands how much to make. It works on the pattern rather than the individual spot, over three to six months, which is why it suits deep jawline acne that flares with the cycle.

Isotretinoin shrinks the oil glands themselves, and much less oil means less of everything downstream: fewer plugs, fewer bacteria, less inflammation. It is the only acne treatment that often keeps working after the course ends.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The cells that make pigment. They sit along the base of the epidermis and hand melanin to the cells around them, which is what gives skin its colour. Dark marks, melasma and the patch left behind by a spot are all these cells making more than usual.

A narrow tube running from the surface down into the skin, with an oil gland at the bottom of it. Oil travels up and out. When the tube blocks, what is behind it has nowhere to go — which is where blackheads and spots start.

Makes sebum, the oil that keeps the surface soft and stops water escaping. How much it makes is set by hormones, not by how often you wash — which is why scrubbing does not fix oily skin.

Cutibacterium acnes lives in the pores of everyone with skin. It is not an infection and it is not a hygiene problem. It only causes trouble when a pore blocks and it multiplies in the oil trapped behind it.

The scaffolding in the dermis that keeps skin firm and springy. It is built by fibroblasts and broken down by age, sun and smoking. Lines and looseness are collagen lost faster than it is replaced.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

What It Treats

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Close-up of the lower cheek, nose and mouth of a young person with medium-brown skin, turned three-quarters away from the camera against a pale blue background. Scattered flat dark brown marks are spread across the cheek, with a few small raised spots still active among them.

Post-Inflammatory Hyperpigmentation

Moderate evidence

Works one step later in the chain than most brightening ingredients: it reduces how much pigment gets passed from the pigment cells into the surrounding skin cells. It is mild, it rarely irritates, and it layers with almost anything. On its own it is a supporting player rather than the backbone of a plan.

Dark Circles Under the Eyes

Dark Circles Under the Eyes

Moderate evidence

Interrupts the transfer of pigment into the skin cells, and it is one of the few brightening actives gentle enough to use on eyelid skin twice a day without irritation. It is a sensible partner to vitamin C or azelaic acid rather than a standalone. It does nothing for blue circles or for a hollow.

Not the Best For

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Close-up of a cheek with pink flushing and fine visible red blood vessels beside the nose

Rosacea

Limited evidence

A mild anti-inflammatory that also helps the barrier hold water, which is the part of rosacea it is most useful for. Some people find it takes the edge off redness and stinging. It will not clear bumps and it does nothing for visible vessels, so treat it as support rather than treatment.

Close-up of the lower cheek, mouth and jaw of a young person with light skin, turned three-quarters away from the camera against a pale blue background. Scattered flat pink-red marks cover the cheek and run down towards the jaw. The skin surface is smooth and even, with no raised spots and no change in texture.

Post-Inflammatory Redness

Limited evidence

Supports the skin barrier and takes the edge off general redness, which helps skin that is settling after acne. Its effect on an individual red mark is small. It is worth including because it almost never irritates, and irritation is the main way people prolong these marks.

Close-up of a cheek with inflamed acne. Raised pink-red bumps, a few with yellow-white heads, sit in a patch of redness, and the skin between them is dry and flaking.

Acne

Limited evidence

Sold heavily for acne, and the evidence for clearing spots is thin. It is genuinely useful for the marks left behind and for tolerating stronger actives - just not as the treatment itself.

Melasma

Melasma

Limited evidence

Slows the handover of pigment from pigment cells to the skin cells around them. Modest on its own and not something that will clear a patch, but it is well tolerated and it does not sting, which counts for a lot in a condition where irritation makes things worse. It sits comfortably alongside the stronger treatments.

Sun Spots (Solar Lentigines)

Sun Spots (Solar Lentigines)

Limited evidence

Slows the handover of pigment from pigment cells to the skin cells above them, so a spot fades a little rather than disappears. Its strength is that it is well tolerated and does not sting, so it sits comfortably alongside a retinol without making the skin sore. Modest on its own.

Wrinkles and Fine Lines

Wrinkles and Fine Lines

Limited evidence

Well tolerated, cheap, and it helps the barrier and the uneven tone that sits alongside lines. Its direct effect on wrinkles is small. It is most useful here as the thing that lets you keep using a retinoid, rather than as a treatment in its own right.

Forms

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Niacinamide is stable, water-soluble and not fussy about what it is mixed with, so it turns up in almost everything. What matters is whether you leave it on. Most products sit between 2% and 5%; 10% is likelier to sting without doing more. Oral nicotinamide is a different thing, a supplement used to lower the formation of certain skin cancers in high-risk people, and only on medical advice.

A row of Niacinamide products sold as serum, photographed on white.
Most common
Serum
Thin and water-like, under moisturizer. The easiest way to control the strength you get.
A row of Niacinamide products sold as moisturizer, photographed on white.
Fewest steps
Moisturizer
Niacinamide inside the cream you were using anyway. Good if your routine is already long.
A row of Niacinamide products sold as toner or essence, photographed on white.
Layering
Toner or essence
Very light and watery. Spreads over the face and neck and dries in seconds.
A row of Niacinamide products sold as sunscreen, photographed on white.
Daytime double duty
Sunscreen
Niacinamide in an SPF you apply anyway. The redness benefit without an extra step.
A row of Niacinamide products sold as cleanser, photographed on white.
Least useful
Cleanser
Rinsed off within a minute, so little stays behind. A bonus, not your source.

Strengths

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Going higher can make results worse, not just slower, because irritated skin is the problem niacinamide is meant to solve. If a 10% serum stings or flushes you, drop to 5%.

WeakestStrongest
2% to 5%10%
Where the evidence sits
2% to 5%
Enough for barrier support, redness and pigmentation.
Marketed as the strong option
10%
Not clearly better, and most likely to cause flushing, stinging or breakouts in sensitive skin.

Basics

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When to Apply
After cleansing, before or within your moisturizer, morning, night or both. It layers under sunscreen and over or under almost anything else. If your acne treatment is drying, niacinamide first and the treatment on top makes it easier to tolerate.
How to Start
A 4% or 5% product once daily, twice daily within a week for most people. It does not replace your acne treatment — use it alongside benzoyl peroxide, adapalene or whatever you were prescribed.
If It Irritates
Uncommon. With very sensitive or rosacea-prone skin, start every other day and watch for flushing. Products above 5% sting more often and are no more effective.
If It’s Not Working
Give it eight to twelve weeks. It is a supporting ingredient, so if acne or redness has not moved, add a main treatment rather than more niacinamide.

Sample Routine

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Here is where Niacinamide sits in a day, and what goes around it. Pick what you are treating and what your skin is like, and the rest of the routine changes to suit.

What to Expect

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Weeks 1 to 2Weeks 4 to 8Weeks 8 to 12
First change
Weeks 1 to 2
Skin feels less tight and less reactive. The quickest thing to notice.
Working
Weeks 4 to 8
Redness eases, inflamed spots calm faster, and retinoids and benzoyl peroxide get easier to tolerate.
Judge it here
Weeks 8 to 12
Dark marks lighten and tone looks more even.

What to Avoid

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  • Niacinamide conflicts with almost nothing That is its main practical advantage.
  • High-strength niacinamide with acids not harmful, but combined stinging is common at 10%. Split them by time of day.
  • The folklore the rule that niacinamide and vitamin C cancel each other out is not accurate. It comes from laboratory work where the two were heated together and converted to a compound that causes flushing. That does not happen at room temperature in a finished product, and plenty of products contain both. Some people find the combination stings, which is comfort, not chemistry.
  • The other myth is that niacinamide has to go on "damp" or "dry" skin at a specific pH. It is stable and forgiving.

If You Stop

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The barrier benefits fade. Niacinamide supports your skin's production of protective lipids only while you use it. Dryness and sensitivity creep back over two to four weeks, most noticeably if you are still using a retinoid or benzoyl peroxide. Pigmentation that already faded stays faded. What you lose is protection against new marks. There is no rebound or withdrawal. Because it is gentle and inexpensive, most people who benefit keep using it.

Ask Your Doctor

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If you are allergic to niacinamide
Uncommon, but it happens.
If a product does not agree with you
The strength or the rest of the formula is a likelier cause.
If your skin is broken or in a flare
Settle it before adding anything.
If you get hives or swelling
Swelling of the face, lips or throat, or a spreading rash.

How It Compares

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Five azelaic acid tubes and bottles on white, most marked 10 percent, from Peach Slices, Paula's Choice, Facetheory, The Ordinary and NaturiumLabeled cutaway diagram of a single skin pore, headed Azelaic Acid. The epidermis is a brick-textured band across the top and the dermis is pink below it, with a yellow oil gland at the base of the pore and a small cluster of bacteria inside it. Three callout lines point in: decreases dead cells in pore and kills bacteria are drawn in dark navy as main effects, and decreases inflammation is drawn in gray as a lesser one.

Azelaic acid

The same

Does more for both acne and dark marks. Niacinamide is gentler and easier to layer with everything else.

Six vitamin C products on white, including La Roche-Posay, L'Oréal Revitalift, CeraVe, Vanicream, bliss and Olay16:9 hero for Vitamin C (L-Ascorbic Acid). Never cropped: the tone strip and the corner logo depend on the full frame.

Vitamin C

The same

Stronger on dullness and pigment, but far less stable and more likely to sting.

Zinc, taken by mouth

Worse

Sometimes suggested for the same problems. The evidence is weaker and the stomach upset is common.

Myths

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  • "If your acne did not clear, it failed." Wrong measure. It does little for blackheads and whiteheads, a modest amount for inflamed spots. Redness, tightness and dark marks are what it is for.
  • "Stinging means you are allergic to it." Mild stinging or flushing is common at 10% and above, and usually stops at a lower strength.

Questions Patients Ask

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Does niacinamide shrink pores?

No. Pore size is largely inherited and no topical product changes it. Niacinamide reduces the oil and dead cells sitting in the pore and calms the surrounding skin, which makes pores look less obvious. Real improvement, different claim.

Can I use niacinamide with vitamin C?

Yes. The idea that they cancel each other out comes from a laboratory experiment involving heat and does not apply to finished products. Many products contain both. If the combination stings, use one in the morning and one at night.

Will niacinamide clear my acne?

On its own, usually not. One small study found 4% niacinamide gel worked about as well as 1% clindamycin gel over eight weeks, but the evidence is thin next to benzoyl peroxide or a retinoid. Use it alongside a proper acne treatment.

Is 10% better than 5%?

Not reliably, and it is likelier to sting or flush. Most published research used 2% to 5%. Ten percent is a marketing number.

Why did I break out after starting a niacinamide serum?

Check the rest of the ingredient list. Niacinamide itself rarely causes breakouts — heavy oils, some silicones and certain thickeners are far more common culprits. Try a different product before giving up on the ingredient.

References

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