Guide · Niacinamide
Niacinamide for skin what it does, which strength to use, and where it stops
Niacinamide is in serums, moisturisers and sunscreens across Singapore. Here is what the evidence supports, which strength makes sense, how to combine it with other actives in a humid climate, and when an ingredient is not enough.
Quick answer
- Niacinamide is a form of vitamin B3 that supports the skin barrier, can reduce oil production and helps even out pigment by slowing the transfer of pigment to skin cells.
- The clinical studies most often cited used 2% to 5%; serums of 10% or more are widely sold, but a higher strength has not been shown to work better and is more likely to sting.
- It is generally well tolerated and can be used alongside vitamin C, retinoids and exfoliating acids; if your skin is sensitive, use them at different times of day and add one new product at a time.
- Niacinamide works gradually over weeks to months; melasma, deep pigment, acne scars and moderate to severe acne need a doctor, and defined dark spots need treatment rather than a serum.
The basics
What niacinamide is
Niacinamide, also called nicotinamide, is the water-soluble, active form of vitamin B3. In the skin it is used to make NAD and NADP, coenzymes involved in energy production and repair. It appears in many cosmetic products, from serums to moisturisers and sunscreens.
It is not the same as niacin (nicotinic acid). Oral niacin is known for causing flushing; DermNet notes that oral nicotinamide does not cause flushing in the same way. Niacinamide is also not a sunscreen and does not prevent sunburn, so it never replaces SPF.
Evidence
What niacinamide does, and what the studies show
Many of these studies were small, short or funded by skincare companies. The overall picture is consistent, though: niacinamide gives modest, gradual improvement and is gentle on most skin.
| Benefit | What the evidence shows | Strength studied |
|---|---|---|
| Less oil | In 100 Japanese adults, a niacinamide moisturiser lowered the rate of sebum production after two and four weeks compared with placebo | 2% |
| More even pigment | Reduced facial hyperpigmentation and increased lightness in Japanese women after four weeks, by slowing pigment transfer to skin cells | 2% (with sunscreen) and 5% |
| Signs of ageing | In a 12-week split-face study of 50 women, improved fine lines, dark spots, red blotchiness, sallowness and elasticity (sponsored by the manufacturer) | 5% |
| Barrier and hydration | Reduces water loss through the skin and has been shown to increase ceramide production | Various |
| Acne | In 76 people with moderate acne, a niacinamide gel was as effective as a 1% clindamycin gel | 4% |
| Melasma | In a small split-face trial of 27 patients, improvement was close to 4% hydroquinone, with fewer side effects | 4% |
Pores and oil
Can niacinamide shrink pores?
Niacinamide does not change the size of the pore itself, but it can reduce the oil that makes pores look bigger and shinier. That makes it useful for oily skin in Singapore's heat, especially alongside salicylic acid, which clears inside the pore.
Pores that look larger because the skin around them has lost firmness, often on the cheeks with age, need collagen-building treatment rather than a serum. Pores clogged with blackheads respond better to regular cleansing facials plus a steady home routine.
Strength
2–5% or 10% and above: which strength?
- 2% to 5%: the range used in most of the frequently cited studies. A sensible starting point for most skin.
- 10% and above: common in shop serums. Some people like them, but there is little evidence that stronger is better, and stinging and redness become more likely.
- Leave-on beats rinse-off: a serum or moisturiser left on the skin is how niacinamide was tested; a cleanser is rinsed away within a minute.
- Twice daily, consistently: studies applied it once or twice a day for four to twelve weeks before judging results.
Combining
Using niacinamide with vitamin C, retinol and acids
Add one new product at a time and give it two to four weeks before adding the next, so you know what helps and what irritates.
- Vitamin C: commonly used together. If the combination stings or flushes your skin, use vitamin C in the morning and niacinamide at night.
- Retinol and other retinoids: a good pairing; niacinamide is often tolerated by people who find retinoids or fruit acids irritating.
- Salicylic and glycolic acids: fine to combine, but layering several exfoliants in one routine raises the risk of irritation. Alternate nights if your skin feels tight or stings.
- Sunscreen: always in the morning. Niacinamide does not protect against UV.
Side effects
Flushing, stinging and irritation
Topical niacinamide is generally well tolerated. Some people still notice redness, stinging, itching or a warm feeling, more often with high-strength serums, on freshly exfoliated or broken skin, or when several actives are layered together. Patch-test a new product on the side of the neck or jaw for a few days first.
If redness settles quickly, try a lower strength or use it every other day. Stop and see a doctor if you develop hives, swelling or a rash that spreads. Oral nicotinamide supplements are different from skincare; check with a doctor or pharmacist before taking high doses.
Singapore routine
A simple niacinamide routine for Singapore's humidity
SkinRev Lab's shop at CityLink Mall stocks Heliocare 360° sunscreens, including an oil-free gel, which you can reserve on WhatsApp and collect in person.
- Morning: gentle cleanser, niacinamide serum, a light gel moisturiser if you need one, then sunscreen of at least SPF 30.
- Midday: reapply sunscreen if you are outdoors, especially between 11am and 3pm.
- Evening: cleanse, niacinamide, then a retinoid or an acid on alternate nights if your skin tolerates them, and moisturiser.
- Office air-conditioning dries the skin even when it feels oily, so do not skip moisturiser entirely.
- For oily skin, choose oil-free, non-comedogenic textures.
Beyond the serum
When ingredients are not enough
Niacinamide is a helpful supporting act, not a treatment for every concern. See a doctor for melasma, grey-brown or blue-grey pigment, defined sun spots, pitted acne scars, painful or scarring acne, and any spot that is changing. At IN Eternity Clinic, Dr Sin Yong assesses these and offers treatments such as Pico Laser, Laser Toning and RF microneedling, priced at consultation.
For dullness and mild uneven tone, SkinRev Lab's non-invasive options include HydraFacial Syndeo (S$288 to S$438), the Needleless SkinBooster (S$288 per region, first region from S$98) and the Rejuran® PDRN Facial (S$128 to S$348), all before GST. The HydraFacial JLo Beauty Booster, which lists niacinamide among its actives, can be added to any tier for S$68.
Sources
References & sources
- Draelos ZD, Matsubara A, Smiles K. The effect of 2% niacinamide on facial sebum production. J Cosmet Laser Ther. 2006;8(2):96-101.
- Hakozaki T, Minwalla L, Zhuang J, et al. The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer. Br J Dermatol. 2002;147(1):20-31.
- Bissett DL, Oblong JE, Berge CA. Niacinamide: a B vitamin that improves aging facial skin appearance. Dermatol Surg. 2005;31(7 Pt 2):860-865.
- Navarrete-Solís J, Castanedo-Cázares JP, Torres-Álvarez B, et al. A double-blind, randomized clinical trial of niacinamide 4% versus hydroquinone 4% in the treatment of melasma. Dermatol Res Pract. 2011;2011:379173.
- DermNet. Nicotinamide.
- Boo YC. Mechanistic basis and clinical evidence for the applications of nicotinamide (niacinamide) to control skin aging and pigmentation. Antioxidants (Basel). 2021;10(8):1315.
Common questions
Your questions,
answered
What does niacinamide do for skin?
It supports the skin barrier and hydration, can reduce oil production, and helps even out pigment by slowing the transfer of pigment to skin cells. Studies have also found modest improvements in fine lines, redness and sallowness.
Can I use niacinamide every day?
Yes. Most studies applied it once or twice daily for weeks to months, and it is generally well tolerated. If your skin stings, reduce to once a day or every other day.
Can I use niacinamide with vitamin C?
Yes, they are commonly used together. If the combination stings or flushes your skin, use vitamin C in the morning and niacinamide in the evening.
Is 10% niacinamide better than 5%?
Not necessarily. The studies most often cited used 2% to 5%, and higher strengths have not been shown to work better. Stronger serums are more likely to cause stinging or redness, so start lower.
Does niacinamide fade dark spots?
It can help flat, superficial pigment gradually, especially with daily sunscreen. It does not remove defined sun spots, Hori's naevus or seborrhoeic keratoses, and melasma needs a doctor's plan.
Does niacinamide help acne and oily skin?
It can reduce oil and calm inflammation, and a 4% gel performed as well as a topical antibiotic gel in one acne study. Moderate, painful or scarring acne still needs a doctor.
Why does niacinamide make my skin red or itchy?
Some people react to high-strength serums, to other ingredients in the product, or to layering several actives. Try a lower strength or use it less often; stop and see a doctor if you get hives, swelling or a spreading rash.
How long does niacinamide take to work?
Oil reduction was measured after two to four weeks in one study, and pigment and ageing changes after four to twelve weeks in others. Give a product at least two months of consistent use before judging it.