Niacinamide (Nicotinamide)
A rare ingredient that genuinely spans two different worlds: as vitamin B3 taken orally it prevents pellagra and serves as an NAD+ precursor, while as a skincare ingredient it regulates sebum, strengthens the skin barrier and brightens discoloration — with real, if differently weighted, clinical evidence on both sides.
Number of studies
3
Safety
Requires caution
Time to effects
Topically: sebum reduction can be measurable after just 2–4 weeks of regular use, effects on the barrier and hydration after 4–6 weeks, and visible reduction in discoloration usually after 8–12 weeks. Orally, in the context of skin-cancer prevention: effect was assessed in trials at 3, 6, 9 and 12 months of regular use.
Monthly cost
ok. 15–80 zł/miesiąc, zależnie od formy i produktu
Price in Poland
Doustnie: 15–35 zł za opakowanie starczające na miesiąc. Miejscowo: 20–80 zł za serum/krem z niacynamidem, zależnie od marki i koncentracji
Who it's for
Niacynamid jest jednym z tańszych w syntezie składników aktywnych, więc wysoka cena niektórych produktów kosmetycznych częściej wynika z marki i formuły niż z samego kosztu surowca.
Indicative prices for the Polish market — we don't point to specific retailers; the real price depends on the manufacturer, form and place of purchase.
Table of contents
TL;DR
A rare ingredient that genuinely spans two different worlds: as vitamin B3 taken orally it prevents pellagra and serves as an NAD+ precursor, while as a skincare ingredient it regulates sebum, strengthens the skin barrier and brightens discoloration — with real, if differently weighted, clinical evidence on both sides.
- →Effective prevention and treatment of pellagra, the niacin/niacinamide deficiency disease
- →In high-risk patients: a large phase 3 clinical trial documented a reduction in the rate of new non-melanoma skin cancers and actinic keratoses
- →Topically: a documented reduction in excess sebum production for combination and oily skin
| Chemical compound | Nicotinamide — the amide form of vitamin B3 (distinct from niacin/nicotinic acid) |
|---|---|
| Group/class | Water-soluble vitamin / cosmetic active ingredient |
| Oral form | Capsules, tablets — usually 500 mg in dermatology trials |
| Topical form | Creams, serums — usually 2–5% niacinamide |
| Evidence level | Strong — one of the best-studied vitamins, also well studied as a cosmetic ingredient |
| Interactions | Limited at physiological doses; possible at very high oral doses |
| Status | Over-the-counter vitamin/supplement; over-the-counter cosmetic ingredient |
Understand
Overview
Niacinamide (nicotinamide) is the amide form of vitamin B3, chemically distinct from niacin (nicotinic acid) — a distinction with real practical consequences, since niacinamide, unlike niacin, doesn't cause the characteristic skin flushing and warmth (the so-called niacin flush) even at higher oral doses. Both forms, once absorbed, lead to the synthesis of nicotinamide adenine dinucleotide (NAD+) and its phosphorylated form (NADP+) — coenzymes essential to hundreds of metabolic reactions in every cell of the body, from mitochondrial energy production to DNA damage repair.
What makes niacinamide unusual compared with most ingredients covered in this knowledge base is that it genuinely operates in two nearly independent contexts, each with its own separate body of research. The first is the classic systemic role of the vitamin — preventing and treating pellagra (the niacin/niacinamide deficiency disease), participating in energy metabolism, and, in newer research, a potential role in preventing non-melanoma skin cancer in high-risk individuals. The second is niacinamide's role as one of the most widely used, well-tolerated active ingredients in skincare — regulating sebum production, strengthening the epidermal barrier function, and reducing discoloration through a biochemical mechanism distinct from classic brightening agents like hydroquinone.
Historically, niacinamide (and niacin) earned vitamin status thanks to research into pellagra — a deficiency disease that, in the early 20th century, decimated poorer populations subsisting mainly on corn (a grain low in bioavailable niacin and tryptophan, an amino acid the body can use to synthesize small amounts of niacin). The classic clinical picture of pellagra, often cited in medical literature, was described as the '4 D's': dermatitis (skin inflammation, especially in sun-exposed areas), diarrhea, dementia and, if untreated, death. The discovery that niacinamide effectively treats and prevents this condition was one of the breakthroughs of early vitamin science.
Today, a niacinamide deficiency severe enough to cause pellagra is rare in developed countries, largely limited to alcoholism, prolonged malnutrition, certain malabsorption syndromes, and the rare Hartnup disease (an inherited tryptophan-absorption disorder). A much larger area of active human research today is the role of oral niacinamide in preventive dermatology — particularly in patients at high risk of non-melanoma skin cancer, where a large clinical trial found a significant reduction in the rate of new lesions, discussed in more detail in the mechanism and studies sections below.
In parallel, in a completely different context, niacinamide has become one of the most popular active ingredients in skincare products worldwide — valued mainly for its exceptionally good tolerability (rarely irritating, unlike retinoids or AHA acids, for instance) combined with genuine, clinically confirmed biological activity in several different areas: regulating sebum production, strengthening the epidermal barrier, and reducing uneven skin tone.
The people who stand to benefit most from niacinamide differ significantly depending on which of its two roles we're talking about. In the oral context, that's mainly patients with a documented deficiency (rare) and, based on newer, more preliminary research, people at high risk of non-melanoma skin cancer, where any decision about preventive supplementation should always be made together with a dermatologist or oncologist, not on one's own. In the topical context, it's primarily people with combination or oily skin seeking sebum regulation, people with a compromised skin barrier (dry, atopic skin, or skin stressed by intensive acid or retinoid treatments), and people with uneven skin tone and post-inflammatory discoloration who want to avoid more aggressive, frequently irritating brightening ingredients.
History of use
The discovery of niacin and niacinamide as the factor preventing pellagra is credited to the research of physician Joseph Goldberger in the US in the 1910s–1920s, who, against the dominant infectious-disease theory of the time, showed that pellagra was a dietary deficiency disease, not a contagious one. The compound itself — niacinamide — was identified and synthesized over the following decades of the 20th century, enabling its use as a medicine and, later, as a widely available vitamin. Niacinamide's use in skincare is considerably more recent — it developed mainly from the 1990s and 2000s onward, alongside the publication of clinical studies on its effects on sebum, the skin barrier and pigmentation, which cemented its now very widespread presence in cosmetics worldwide.
Mechanism of action
In the systemic context, niacinamide is a precursor of NAD+ and NADP+ via the so-called Preiss-Handler pathway — once absorbed, it's converted by the enzyme nicotinamide phosphoribosyltransferase (NAMPT) directly into nicotinamide mononucleotide (NMN, the same intermediate compound covered separately in our NMN entry), and then by the enzyme NMN adenylyltransferase into full NAD+. NAD+ and NADP+ are key coenzymes in hundreds of oxidation-reduction reactions, including the mitochondrial electron transport chain responsible for ATP production, and they also serve as a substrate for DNA-repair enzymes from the PARP family (poly-ADP-ribose polymerases) and for sirtuins — enzymes that regulate, among other things, gene expression and the response to metabolic stress.
It's precisely NAD+'s role as a PARP substrate that underlies the hypothesis explaining niacinamide's potential effect on skin-cancer prevention: UV radiation damages the DNA of epidermal cells, and repairing that damage partly depends on PARP activity, which in turn depends on NAD+ availability. UV radiation is also known to deplete cellular ATP and NAD+ reserves — so, in theory, replenishing the NAD+ pool through oral niacinamide could support epidermal cells' ability to repair DNA after sun exposure and reduce the number of cells that fail that repair and undergo malignant transformation. This remains a mechanistic hypothesis supported by the clinical trial results described in the studies section, not a fully settled, definitively confirmed molecular mechanism.
Niacinamide's topical effects on skin rely on entirely different cellular mechanisms, largely independent of its role in NAD+ synthesis. In the context of sebum regulation, niacinamide affects lipid metabolism in the sebaceous glands (sebocytes), limiting excess sebum production — the mechanism still isn't described with full biochemical precision, but is consistently confirmed at the level of clinical effect across independent studies. In the context of the epidermal barrier, niacinamide stimulates the synthesis of ceramides and free fatty acids in the stratum corneum, which translates into reduced transepidermal water loss (TEWL) and better-hydrated, more irritation-resistant skin. In the context of discoloration, the mechanism is best described: niacinamide doesn't block the enzyme tyrosinase (the way hydroquinone or kojic acid do) but instead inhibits the transfer of melanosomes (melanin-containing vesicles) from melanocytes to surrounding keratinocytes — in vitro studies found this reduction in melanosome transfer reached 35–68%, which translated into noticeable brightening of discoloration in clinical studies without affecting melanin production in melanocytes itself.
Absorption and conversion to NMN
The enzyme NAMPT converts absorbed niacinamide directly into nicotinamide mononucleotide (NMN) — the same intermediate compound described in our NMN entry.
NAD+/NADP+ synthesis
NMN is further converted into full NAD+, and partly into NADP+ — coenzymes essential for energy metabolism and DNA repair.
Supporting DNA repair via PARP
NAD+ serves as a substrate for PARP enzymes that repair DNA damage caused by, among other things, UV radiation — the hypothesized mechanism behind skin-cancer prevention research.
Inhibiting melanosome transfer (topical)
Niacinamide applied to skin inhibits the transfer of melanosomes from melanocytes to keratinocytes, reducing the visibility of discoloration without blocking tyrosinase itself.
Stimulating ceramide synthesis (topical)
Niacinamide increases the production of ceramides and free fatty acids in the stratum corneum, strengthening the epidermal barrier and reducing transepidermal water loss.
Modulating sebocyte activity (topical)
Niacinamide affects lipid metabolism in the sebaceous glands, which in clinical trials translates into a measured reduction in sebum output.
Evidence: strong — based on 3 studies in this database.
Benefits
Common myths
MythNiacinamide and niacin are exactly the same substance, so they work identically.
FactThese are two chemically different forms of vitamin B3 — niacin (nicotinic acid) causes the characteristic flushing and warmth (niacin flush) and, at high doses, is sometimes used to manage lipid levels, neither of which niacinamide does or causes.
MythTopical niacinamide brightens skin the same way hydroquinone does, just more weakly.
FactThe mechanism is different — niacinamide doesn't block melanin production (tyrosinase); it inhibits melanosome transfer to keratinocytes instead. That's a distinct biochemical mechanism, not a weaker version of hydroquinone's mechanism.
MythNiacinamide and vitamin C can never be combined in one routine because they cancel each other out.
FactThis is a popular but largely outdated belief, based on older in vitro studies under very specific pH conditions. Newer data and clinical practice suggest that with standard, well-formulated cosmetics this interaction has limited practical relevance — some people still prefer to separate application times anyway, for their own peace of mind.
MythA higher niacinamide concentration in a cream always gives a proportionally better effect.
FactMost clinical trials showing an effect on sebum, the barrier and pigmentation used 2–5% concentrations, while higher concentrations (≥10%) have less direct evidence of an advantage, alongside a higher risk of transient irritation.
MythTaking oral niacinamide will automatically improve skin appearance the same way the topical form does.
FactEvidence for niacinamide's skin effects mostly concerns the topical form applied directly to skin — oral supplementation has mainly been studied in the context of skin-cancer prevention in high-risk groups, not the cosmetic appearance of skin in the average person.
MythPellagra is a historical disease that no longer occurs anywhere in the world.
FactIt's far rarer than a century ago, but is still described in medical literature in people with alcoholism, severe malnutrition, malabsorption syndromes, and in some parts of the world with diets based mainly on corn that hasn't been properly processed (nixtamalized).
Forms & variants
Niacinamide (Nicotinamide) comes in several forms that differ in bioavailability and use case — the form you pick genuinely matters for how effective the supplementation is.
Oral niacinamide (supplement/vitamin)
The standard vitamin form used for deficiency prevention and, at higher doses, studied in the context of preventive dermatology under medical supervision.
Best for: Deficiency prevention; patients at high risk of skin cancer, following a medical consultation
Topical niacinamide, low concentration (2–5%)
The most frequently studied and used concentration in cosmetics — a good balance between efficacy (confirmed in studies on sebum, the barrier and pigmentation) and minimal irritation risk.
Best for: Daily skincare, sebum regulation, strengthening the skin barrier, most skin types
Topical niacinamide, high concentration (≥10%)
Popular in products marketed as intensively brightening, but with fewer clinical studies confirming an advantage over lower concentrations and a higher risk of transient irritation.
Best for: People with pronounced discoloration who tolerate higher concentrations of active ingredients well
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Practice
Frequently asked questions
These are two chemically different forms of vitamin B3. Niacin (nicotinic acid) causes the characteristic flushing and warmth of the skin (niacin flush) and, at high doses, is sometimes used to manage lipid levels. Niacinamide (nicotinamide) doesn't cause this effect and is studied mainly in the context of dermatological prevention and as a cosmetic ingredient.
A large phase 3 clinical trial (ONTRAC, Chen et al., NEJM 2015) found a 23% reduction in the rate of new non-melanoma skin cancers at a dose of 500 mg twice daily for 12 months in high-risk patients (at least two prior non-melanoma skin cancers within 5 years). This isn't yet a universally recommended prevention strategy for everyone — any decision about this kind of supplementation should be discussed with a dermatologist or oncologist.
Most clinical trials on sebum, the skin barrier and pigmentation used 2–5% concentrations, which is a well-documented reference point. Higher concentrations (10% and above) are popular on the market but have less direct evidence of a proportionally better effect, alongside a higher risk of transient irritation.
Indirectly, yes — by regulating excess sebum production and through anti-inflammatory activity, which can reduce the severity of acne lesions in people with oily skin. It isn't, however, a first-line acne treatment in the dermatological sense (like benzoyl peroxide or retinoids), but rather a well-tolerated supporting ingredient in a daily routine.
Yes, and it's a common, well-tolerated combination — thanks to its barrier-strengthening and soothing effects, niacinamide is often recommended specifically for people using retinoids or acids, to help limit the irritation that comes with those more active ingredients.
Evidence for the benefits of oral niacinamide in an average healthy person without a confirmed deficiency or elevated skin-cancer risk is limited — most solid clinical trials focused on these two specific groups, not on the general population looking for, say, better skin appearance, which the topical form addresses better.
In clinical trials such as Hakozaki et al., a noticeable reduction in discoloration and improved skin tone was usually observed after 8–12 weeks of regular, daily use — as with most active ingredients targeting pigmentation, the effect builds gradually, not within the first few days.
Dosage & timing
Typical dose
Deficiency prevention: RDA of about 14–16 mg/day; in dermatology trials on skin-cancer prevention: 500 mg twice daily (1000 mg/day) under medical supervision. Topically: cosmetics with 2–5% niacinamide, applied once or twice daily
Form
Capsules/tablets taken orally; creams and serums with niacinamide applied topically to skin
Dosing is informational and reflects the ranges used in the cited studies — it does not replace consulting a doctor or pharmacist.
Best times to take it
- Orally: usually with a meal, in divided doses for higher therapeutic amounts
- Topically: morning and/or evening after cleansing, before moisturizer and UV filter
- When introducing a high topical concentration (≥10%), it's worth starting with every-other-day use to assess individual tolerance
Safety
Side effects & contraindications
Possible side effects
At very high oral doses (several grams daily) — hepatotoxicity has been reported in the literature, unlike typical dermatological doses (500 mg twice daily), considered safe
Rarely: gastrointestinal discomfort at higher oral doses
Topically: rare, transient redness or tingling when first using high concentrations (usually ≥10%)
Topically: a theoretical possibility of irritation when combined with certain low-pH acids in the same routine — some people report better tolerance when applications are separated in time
Very rarely: hypersensitivity reactions to a specific cosmetic formula — more often linked to other ingredients in the product than to niacinamide itself
Contraindications
Known hypersensitivity to niacinamide or niacin
High oral doses (gram-level, not dermatological doses) — caution in people with liver disease
A decision about preventive oral supplementation in an oncology context (high skin-cancer risk) should always be made together with a doctor, not independently
Interactions
Carbamazepine — high doses of niacinamide may theoretically affect its metabolism, requiring caution with concurrent use
Anticoagulants — very high doses of niacinamide are sometimes described as potentially affecting clotting time, though data are limited
Topically: ascorbic acid (vitamin C) at low pH is sometimes considered formulation-incompatible with niacinamide in the same product — some manufacturers recommend separating morning/evening application, though newer data suggest this interaction has limited clinical relevance with standard formulas in practice
At physiological doses (typical of vitamin supplementation), drug interactions are rare and poorly documented
Is it worth taking?
Who it's for
- People with combination or oily skin seeking to regulate excess sebum production
- People with a compromised skin barrier — dry, atopic skin, or skin irritated after acid or retinoid treatments
- People with post-inflammatory discoloration or uneven skin tone looking for a gentler alternative to hydroquinone
- Patients at high risk of non-melanoma skin cancer — only under the supervision of a dermatologist or oncologist when considering oral prevention
- People with a confirmed vitamin B3 deficiency (rare in developed countries)
Not for
- Known hypersensitivity to niacinamide or niacin
- High oral doses (gram-level, not dermatological doses) — caution in people with liver disease
- A decision about preventive oral supplementation in an oncology context (high skin-cancer risk) should always be made together with a doctor, not independently
Evidence
Worth knowing
Niacinamide and niacin are chemically different forms of vitamin B3 — only niacin causes the characteristic skin flushing (niacin flush).
In a large phase 3 clinical trial (ONTRAC), oral niacinamide reduced new non-melanoma skin cancers by 23% in high-risk patients.
Niacinamide is a precursor of the same intermediate compound (NMN) studied separately as a potential longevity supplement.
Topically, niacinamide fights discoloration by blocking melanosome transfer, not by blocking melanin production — a different mechanism from hydroquinone.
The classic clinical picture of severe deficiency (pellagra) was described as the '4 D's': dermatitis, diarrhea, dementia, death.
Studies
Oral nicotinamide at 500 mg twice daily for 12 months reduced the rate of new non-melanoma skin cancers by 23% versus placebo in high-risk patients.
Chen AC et al. (the ONTRAC trial), New England Journal of Medicine, 2015
A Phase 3 Randomized Trial of Nicotinamide for Skin-Cancer Chemoprevention
Strong evidenceChen AC, Martin AJ, Choy B, Fernandez-Penas P, Dalziell RA, McKenzie CA, et al. · New England Journal of Medicine · 2015
The ONTRAC trial: 386 high-risk patients (at least two non-melanoma skin cancers in the previous 5 years) were assigned to 500 mg nicotinamide twice daily or placebo for 12 months. Nicotinamide reduced the rate of new non-melanoma skin cancers by 23% (30% reduction for basal cell carcinoma, 20% for squamous cell carcinoma) and significantly reduced the number of actinic keratosis lesions, with a good safety profile.
View studyThe effect of 2% niacinamide on facial sebum production
Moderate evidenceDraelos ZD, Matsubara A, Smiles K · Journal of Cosmetic and Laser Therapy · 2006
Two independent studies (Japan, n=100, and a Caucasian group, n=30) found that 2% topical niacinamide significantly reduced sebum excretion rate after 2–6 weeks of use versus placebo, with good skin tolerability in both ethnic groups.
View studyThe effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer
Moderate evidenceHakozaki T, Minwalla L, Zhuang J, et al. · British Journal of Dermatology · 2002
In vitro studies found that niacinamide reduced melanosome transfer from melanocytes to keratinocytes by 35–68% without affecting melanin production itself. In a clinical study of Japanese women, topical niacinamide significantly reduced the visibility of discoloration and improved skin tone versus control.
View studySources & bibliography
Citations are illustrative for this demo version and require full bibliographic verification by the editorial team before production publication.
Compare with similar entries
About the authors of this entry
Author
dr Katarzyna LewandowskaCardiologist
Katarzyna works as a cardiologist at a Warsaw teaching hospital and has spent years focused on cardiovascular prevention — trying, as she puts it, to convince people to change their habits before they end up on her ward, not after. She joined VitMode after a series of conversations with Anna at a lifestyle-medicine conference, where the two discovered they shared the same frustration: an internet full of contradictory claims about cholesterol, aspirin and heart supplements, with no clear signal of what's actually backed by research. She reviews content on cardiovascular health, lipid panels and pharmacological prevention, consistently distinguishing what helps a statistical population from what makes sense for a specific person. Off duty, she road-cycles — not for performance, but because, in her words, it's hard to write credibly about prevention without practicing it yourself.
58 publications on this site
Medical review
dr Anna KowalczykEditor-in-Chief, Molecular Biology
Anna studied molecular biology at the University of Warsaw, then spent eight years after her PhD in a lab researching the mechanisms of cellular aging and autophagy. She stumbled into science journalism almost by accident — frustrated by how easily her field's findings get oversimplified in the media, she started a blog explaining the biology of aging in plain language. That blog became the seed of VitMode. Today Anna oversees the entire editorial process, holding every piece to the same rigor her old lab demanded: primary sources, methodology checks, and honesty about the limits of the evidence. Outside work, she's a dedicated boulderer.
196 publications on this site
Related entries
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4.2NAD+ Recycling
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Comments (2)
- KW
Kasia W. 2 weeks ago
Very clearly explained, especially the interactions section — I hadn't seen it laid out this well anywhere else.
- MT
Marek T. a month ago
Are you planning to update this with the newest study from this year? I saw an interesting meta-analysis.