Does niacinamide help with acne? The evidence

Niacinamide is a form of vitamin B3, and it now appears in serums, moisturizers and cleansers sold for acne. The research behind it is real but small. This guide goes through what the trials found, what the acne guideline says, and where niacinamide fits next to the treatments with stronger proof. For what niacinamide does in general, start with what niacinamide does for your skin.

What the acne guideline says

The American Academy of Dermatology published its acne guideline in 2024. A panel of doctors looked at the studies for many acne treatments and gave each one a rating. For niacinamide, the panel reached no rating. Its words are that "available evidence is insufficient to develop a recommendation" on "oral or topical niacinamide for acne treatment." Topical means put on the skin. Oral means taken as a pill.

The panel's reason was the size of the evidence: the studies were too few and too small to decide.

The same guideline gives strong support to benzoyl peroxide and to retinoids such as adapalene. Skinli's plan uses adapalene 0.1 percent and benzoyl peroxide 2.5 percent for this reason. If you have to pick one product for pimples, pick one of those first. The complete acne skincare routine explains how.

The three main trials

Most of what is known about niacinamide and acne comes from three trials. Each compared a niacinamide gel with clindamycin, a prescription antibiotic gel.

Trial	People	Niacinamide gel	Compared with	Length	Result
Shalita, 1995	76	4 percent, twice a day	1 percent clindamycin	8 weeks	82 percent improved with niacinamide, 68 percent with clindamycin
Khodaeiani, 2013	80	4 percent, twice a day	1 percent clindamycin	8 weeks	Similar drop in acne scores; niacinamide did better on oily skin
Shahmoradi, 2013	60 women	5 percent	2 percent clindamycin	8 weeks	No difference between the two gels

In the 1995 trial, red pimples and pus bumps fell by 60 percent with niacinamide and by 43 percent with clindamycin. The authors said the gap was too small to be sure it was real, so they called the two gels comparable. In the 2013 trial of 60 women, both groups improved and the researchers saw no side effects.

These trials matter because they are the best direct tests. They also have limits:

• Each lasted only 8 weeks, which says nothing about long-term use.
• None had more than 80 people.
• They compared niacinamide with an antibiotic gel. None compared it with benzoyl peroxide or adapalene, the treatments in Skinli's plan.
• The 1995 authors chose an antibiotic gel as the comparison because antibiotic use is linked to bacteria that stop responding to antibiotics. Niacinamide carries no such risk.

A 2026 review in Skin Health and Disease, written for the British Association of Dermatologists, calls many of these clindamycin comparisons "low-quality evidence." The same review describes a third study of 80 people in which adding 4 percent niacinamide to clindamycin gave no extra benefit over clindamycin alone.

What the reviews conclude

A 2017 review in Dermatologic Therapy searched for every clinical study of niacinamide and acne. It found 10. Six of the eight studies of niacinamide on the skin showed fewer pimples than at the start, or results close to another standard treatment. The two studies of a pill containing nicotinamide also showed fewer pimples. The niacinamide vs niacin guide covers the pills. No major side effects were reported. Even so, the review concluded that niacinamide "has an unclear effect on acne vulgaris due to the limited nature of the available literature."

The 2026 review comes to a similar conclusion. It says stronger support exists for retinol, benzoyl peroxide and azelaic acid, and that niacinamide "could be promising" as an addition, "although there is less robust evidence to support their use." It also says niacinamide "may be most beneficial for patients with mild-to-moderate acne, sensitive skin or those unable to tolerate prescription treatments."

The American Academy of Dermatology's page on facial masks lists niacinamide among ingredients for oily or acne-prone skin, "to help reduce shiny skin and acne." That is a skin care suggestion from the same organization whose guideline found the evidence too thin for a treatment recommendation. Both statements can be true at once: niacinamide is a reasonable ingredient in a product for acne-prone skin, and it has not been proven as an acne treatment by itself.

Questions the trials leave open

The three trials tested gels made for the study. The serums and creams sold in shops use their own mix of ingredients, and those mixes have their own, separate test results, if any. The trials also leave these points open:

• Blackheads and whiteheads. The 1995 trial counted red pimples and pus bumps. None of the three trial summaries reports blackhead and whitehead counts on their own.
• Use past 8 weeks. Each trial lasted 8 weeks, and the 2017 review asked for studies that follow people for longer.
• Different skin tones. The trials were run in the United States and Iran, and their summaries give no results by skin tone.

Until larger studies answer these, treat niacinamide as a possible help with modest proof.

How niacinamide might help pimples

Researchers describe three possible ways niacinamide acts on acne:

1. Less redness and swelling. Lab studies show niacinamide lowers signals that cause inflammation, the process that makes a pimple red and sore.
2. Less oil. A 2006 trial found 2 percent niacinamide lowered skin oil in 100 Japanese adults. Oil feeds the clogged pores where acne starts. The niacinamide for oily skin guide covers that trial in detail.
3. A stronger skin barrier. The skin barrier is the top layer of skin that keeps water in and irritants out. Niacinamide raises the fats in that layer, which may help skin put up with stronger acne treatments.

The reviews list these three actions. Unclogging pores is the main job of salicylic acid and adapalene, so blackheads and whiteheads usually need one of those. The salicylic acid vs benzoyl peroxide guide compares two of them.

Oily skin may respond better

The 2013 trial of 80 people split each group into oily and non-oily skin. Niacinamide worked better on oily skin, and the antibiotic gel worked better on non-oily skin. The 2026 review repeats this: "It appears that niacinamide is more effective in oily skin types." One trial is too small to be sure. If your skin is oily, this result is one reason to try niacinamide.

Using niacinamide next to proven acne treatments

The most practical use of niacinamide may be as a support for the treatment that does the main work. In a 2024 trial, 40 people with mild to moderate acne used benzoyl peroxide 5 percent and adapalene 0.1 percent. They applied a moisturizer with ceramides and niacinamide on one side of the face and a plain cream on the other. After 8 weeks, the niacinamide side had fewer pimples and less irritation. The moisturizer held ceramides as well, so this result cannot be credited to niacinamide alone.

The 2026 review describes a trial of 88 people using adapalene with benzoyl peroxide, where a cleanser and cream that each contained 2 percent niacinamide, plus other ingredients, led to less skin sensitivity than ordinary skin care. Acne cleared in both groups.

If you already use adapalene or benzoyl peroxide, a plain moisturizer with niacinamide is a gentle way to add it. Skinli's plan asks you to add nothing new for 12 weeks after starting the acne gels. If you want to add niacinamide, add it before you start, or wait until the 12 weeks are done, so that you can tell what caused any sting. Patch test any new product first, using how to patch test a new skincare product. For specific pairs, see salicylic acid with niacinamide and niacinamide with tretinoin.

How to try it for acne

If you decide to try niacinamide for pimples, keep to what the trials did:

• Strength: 4 or 5 percent. The trials did not test 10 percent or higher.
• How often: twice a day, as in the trials, on clean skin.
• Where: a thin layer on the whole area that breaks out, since acne forms in pores you cannot see yet.
• How long: 8 weeks before you judge it, and 12 weeks is better. Skin needs 8 to 12 weeks to change.
• One new product at a time, so you know what helped and what caused a reaction.

Take a photo each week in the same light. Slow change is hard to see in a mirror, and acne progress photos make it visible.

When to see a doctor instead

Niacinamide is a skin care ingredient, and deep or painful acne needs more. See a doctor if you have large, painful lumps under the skin, acne that leaves dents or dark marks, acne that spreads fast, or acne that has not improved after 12 weeks of steady care. The NHS also advises seeing a doctor if acne is affecting your mental health. A doctor can prescribe treatments with far more evidence than any over-the-counter serum.