Niacinamide benefits: what the studies show
Niacinamide is a form of vitamin B3. In published trials, a 2% cream lowered facial oil within 4 weeks, and 4 to 5% creams faded dark spots and softened fine lines over 8 to 12 weeks. It also helps skin rebuild its moisture barrier. The effects are real, modest, and slower than prescription creams.
Published · Written by Kay Woodson · Results vary.What has niacinamide been shown to do?
Each row is one published study. Read the third column: small groups, mostly outside the US, and almost no Black participants.
| Benefit | Strength and length | Who took part | What changed |
|---|---|---|---|
| Less facial oil | 2% moisturizer, 4 weeks | 100 adults in Japan, half on a placebo cream; 30 white adults in the US for 6 weeks | Oil output fell in the Japanese group by week 2. In the US group, oil sitting on the skin fell, but output did not |
| Fading dark spots | 5% moisturizer on one side of the face, plain cream on the other; 2% plus sunscreen in a second trial | 18 Japanese women with dark spots; 120 women with facial tanning | Less hyperpigmentation than the plain cream after 4 weeks |
| Melasma patches | 4% cream on one cheek, 4% hydroquinone on the other, 8 weeks | 27 patients in Mexico | Good to excellent results in 44% with niacinamide and 55% with hydroquinone. Side effects in 18% versus 29% |
| Fine lines, blotches, sallow tone | 5% twice a day on half the face, 12 weeks | 50 white women with sun-aged skin | Fewer fine lines and spots, less red blotchiness and yellowing, better elasticity |
| Breakouts | 4% gel against 1% clindamycin gel, 8 weeks | 80 adults in Iran with moderate acne | Both lowered acne grades by a similar amount. Niacinamide did better in oily skin |
The fine-lines trial and the dark-spot trial were run by scientists at Procter & Gamble, a company that sells niacinamide skin care. Full references under Sources.
How does niacinamide fade dark spots?
Not the way most brighteners do. Many fading ingredients slow tyrosinase, the enzyme that makes melanin. In the 2002 lab work behind the Japanese trial, niacinamide left that enzyme alone. Instead, it cut the transfer of pigment packets from pigment cells to the surface skin cells by 35% to 68% in a cell culture.
So the pigment is still made, but less of it reaches the skin you see. That is one reason niacinamide often sits in the same routine as vitamin C, which works at the enzyme step. The vitamin C guide covers that side.
Does it repair the skin barrier?
The barrier is the outer layer of lipids that holds water in and keeps irritants out. Ceramides are a large part of it. A 2000 study from Japan found that niacinamide raised ceramide production in cultured skin cells, and that applying it to dry skin raised ceramide levels and cut water loss through the skin.
That finding comes from cell cultures and a skin test, and the published summary does not state how many volunteers took part. It supports the idea that niacinamide is calming rather than harsh. It does not make niacinamide a treatment for eczema or any skin disease.
What niacinamide does not do
It does not replace prescription care. In the melasma trial, hydroquinone still scored higher. Melasma needs a dermatologist's plan; see melasma.
The acne evidence is thin. A 2020 Cochrane review pooled 49 trials of non-prescription acne ingredients with 3,880 people. Four of them tested nicotinamide against antibiotic treatments, none measured how much people felt their acne improved, and the reviewers rated the evidence low quality. Deep, painful cysts go to a board-certified dermatologist.
It is not a sunscreen. Every pigment trial above paired the cream with daily sun protection, or tested it against a plain cream. Sun undoes the work of any fading product.
What changes for darker skin?
The research has a gap. The trials in the table enrolled Japanese, white, Mexican and Iranian adults. A 2010 review of hyperpigmentation in skin of color, by Davis and Callender, notes that niacinamide is usually used at 2% to 5%, and that its safety and effect on post-inflammatory dark marks in darker skin had not been studied.
The American Academy of Dermatology's list of ingredients for dark spots in darker skin tones names azelaic acid, glycolic acid, kojic acid, retinoids and vitamin C. Niacinamide is not on it. Its appeal for melanin-rich skin is that it was well tolerated in these trials, and irritation is what turns small marks into lasting ones. The AAD's rule holds here too: if a product burns or stings, stop using it.
For the marks left after breakouts on darker skin tones, the post-inflammatory hyperpigmentation guide explains the timeline and what helps.
How to add niacinamide to your routine
- Look for a product that states its strength. The trials above used 2% to 5%.
- Apply it after cleansing, once or twice a day. The fine-lines trial used it twice daily.
- Add it alone, not on the same week as three other new products, so you know what your skin is reacting to.
- Keep daily broad-spectrum sunscreen, SPF 30 or higher. For darker skin, the AAD suggests a tinted formula with iron oxide.
- Give it 8 to 12 weeks, the length of most of these trials, before you decide.
Using retinol too? The retinol for beginners guide explains how to pair the two.
Bring the bottle to your facial
Karisma Esthetics does not sell a niacinamide product. If you are unsure your serum fits the rest of your routine, bring it to a Signature Facial, $125 for 60 minutes with the consultation included, and go through it with Kay Woodson.
Niacinamide questions
How long does niacinamide take to work?
In the trials, oil dropped within 2 to 4 weeks and dark spots faded after 4 weeks of a 5% cream. The fine-lines result took 12 weeks of twice-daily use.
Is niacinamide good for dark spots on dark skin?
It may help and it is gentle, but it has barely been studied in darker skin. A 2010 review found no studies of niacinamide for post-inflammatory dark marks in skin of color. Vitamin C, azelaic acid and retinoids are on the AAD's list for darker skin tones.
Does niacinamide shrink pores?
None of the trials here measured pore size. It lowered oil in one of them, and oil output is the factor most linked to pore size in a 60-person study. See large pores on your face.
Can I use niacinamide every day?
The trials used it once or twice a day for up to 12 weeks. In the melasma trial, 18% of people had side effects with niacinamide, fewer than with hydroquinone. Stop any product that burns or stings.
- Bissett DL et al. Niacinamide: a B vitamin that improves aging facial skin appearance. Dermatol Surg 2005;31(7 Pt 2):860-5, July 2005, read October 29, 2026
- Draelos ZD et al. The effect of 2% niacinamide on facial sebum production. J Cosmet Laser Ther 2006;8(2):96-101, June 2006, read October 29, 2026
- Hakozaki T et al. The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer. Br J Dermatol 2002;147(1):20-31, July 2002, read October 29, 2026
- Navarrete-Solís J et al. A double-blind, randomized clinical trial of niacinamide 4% versus hydroquinone 4% in the treatment of melasma. Dermatol Res Pract 2011, July 2011, read October 29, 2026
- Khodaeiani E et al. Topical 4% nicotinamide vs. 1% clindamycin in moderate inflammatory acne vulgaris. Int J Dermatol 2013;52(8):999-1004, August 2013, read October 29, 2026
- Liu H et al. Topical azelaic acid, salicylic acid, nicotinamide, sulphur, zinc and fruit acid for acne. Cochrane Database Syst Rev 2020, May 2020, read October 29, 2026
- Tanno O et al. Nicotinamide increases biosynthesis of ceramides as well as other stratum corneum lipids. Br J Dermatol 2000;143(3):524-31, September 2000, read October 29, 2026
- Davis EC, Callender VD. Postinflammatory hyperpigmentation: a review of the epidemiology, clinical features, and treatment options in skin of color. J Clin Aesthet Dermatol 2010;3(7):20-31, July 2010, read October 29, 2026
- How to fade dark spots in darker skin tones, American Academy of Dermatology, last updated March 10, 2025, read October 29, 2026