Niacinamide for Acne: What Small Trials Show and What to Expect

Niacinamide (also called nicotinamide, a form of vitamin B3) is a gentle, well-tolerated skincare ingredient that may modestly help acne by calming inflammation and reducing oil. The catch: the acne trials are small, several are more than a decade old, and it isn’t among the treatments recommended in the 2024 American Academy of Dermatology (AAD) guideline. Think of it as a supportive, barrier-friendly extra, not a replacement for proven acne treatments.

What is niacinamide?

Niacinamide is the amide form of vitamin B3. In research papers it’s usually called nicotinamide; on skincare labels it’s usually niacinamide. It’s the same molecule. DermNet notes that, unlike its precursor nicotinic acid (niacin), nicotinamide “does not cause flushing or gastrointestinal upset.”

Topically it shows up in serums, moisturizers and gels. DermNet mentions a 4% gel studied for acne, a 2% moisturizer studied for oiliness, and 5% formulations studied for skin aging. In the US, niacinamide is a cosmetic ingredient, not an approved acne drug.

How might niacinamide help acne?

Researchers point to three possible mechanisms:

• Anti-inflammatory effects. A 2017 review in Dermatologic Therapy describes nicotinamide as a vitamin with “potent anti-inflammatory properties,” which is why it has been studied for red, inflamed spots.
• Less oil. A 2006 study found 2% topical niacinamide significantly reduced sebum excretion rate in a 4-week, double-blind, placebo-controlled trial of 100 Japanese participants. In a separate 6-week split-face study of 30 Caucasian participants, it reduced casual sebum levels (oil on the surface) but not the sebum excretion rate.
• A stronger skin barrier. In lab and skin studies published in 2000, nicotinamide increased ceramide production 4.1- to 5.5-fold in cultured skin cells, and topical application increased ceramides and free fatty acids in the outer skin layer and reduced water loss in dry skin.

Note what’s missing: niacinamide doesn’t have the pore-unclogging evidence of a retinoid or the antibacterial action of benzoyl peroxide. Its possible benefits are more about calming and supporting skin.

What does the evidence show?

Honestly: some encouraging small trials, no strong conclusions. The 2017 review found 10 clinical studies. Six of the eight topical studies showed a significant reduction in acne from baseline or performed similarly to a standard treatment, and no major side effects were noted. But the authors concluded that nicotinamide “has an unclear effect on acne vulgaris due to the limited nature of the available literature.”

Two caveats about those clindamycin comparisons. First, they’re small and short. Second, the comparison drug was topical clindamycin used on its own, and current guidance discourages that: the NICE-based pathway summarized by NHS Scotland advises against topical antibiotic monotherapy. “As good as clindamycin alone” is therefore not the same as “as good as today’s recommended treatments.”

It’s also telling what the major guideline says. The 2024 AAD guideline’s recommended topical therapies are benzoyl peroxide, topical retinoids, topical antibiotics, clascoterone, salicylic acid and azelaic acid. Niacinamide isn’t on the list, and the AAD’s patient guide to OTC acne ingredients doesn’t include it either. For context on how uncertain acne evidence can be generally, a 2024 Cochrane overview of topical acne treatments found no high-certainty evidence for any of the therapies it covered.

Niacinamide and the skin barrier

This is where niacinamide may be most useful for people with acne. Proven treatments like adapalene and benzoyl peroxide often cause dryness and irritation, which is a common reason people quit. The 2024 split-face trial is interesting here: when a ceramide-and-niacinamide moisturizer was paired with benzoyl peroxide and adapalene, the moisturizer side had significantly greater improvement in acne lesions than a basic hydrophilic cream after 8 weeks. The authors concluded such a moisturizer can help improve acne lesions and reduce irritation alongside acne medication.

That’s a promising finding, but keep it in proportion. It was 40 people, the moisturizer combined ceramides and niacinamide (so we can’t credit niacinamide alone), and measures like water loss and hydration improved on both sides with no significant difference. As coverage of the study noted, the researchers themselves called for larger studies. For choosing a moisturizer in general, see moisturizer and sunscreen for acne.

How to use niacinamide in an acne routine

• Use it as an add-on. Keep a guideline-backed active, such as adapalene or benzoyl peroxide, as the core of your routine, and add niacinamide in a moisturizer or serum if you want extra soothing or oil control.
• Stick to studied strengths. The acne trials above used 4%, and the oil study used 2%. I couldn’t find good evidence that much higher strengths work better for acne.
• Watch for dryness. DermNet suggests that if twice-daily use causes excessive drying, reduce to once a day.
• Give it time. The trials ran for 4 to 8 weeks. The AAD’s general advice is to give any acne treatment six to eight weeks before judging it.

Side effects and safety

Niacinamide’s big selling point is tolerability. The 2017 review reported no major adverse side effects across the studies it summarized, and the 2013 trial reported none. Some people do notice dryness or irritation, especially when layering several products, and any cosmetic can occasionally cause an allergic reaction.

I couldn’t find pregnancy-specific guidance on topical niacinamide from the major dermatology sources I checked, so if you’re pregnant or breastfeeding, run your skincare past your obstetrician or dermatologist like any other product.

Realistic expectations

If you have mild acne with redness and oiliness, niacinamide may take the edge off, and it’s unlikely to irritate. If you have persistent adult or hormonal acne, or inflamed spots that leave marks, it’s very unlikely to be enough on its own. The strongest evidence remains with topical retinoids, benzoyl peroxide and, for many adults, prescription options. Niacinamide’s best role is making those treatments easier to live with.

Frequently asked questions