Region — International. Neutral scientific reference — not offered for sale here.

Set region

Explore Shop Tools Journal Trust

Explore  /  Niacinamide (Vitamin B3)

Research reference — not for sale

Niacinamide (Vitamin B3)

A

lead outcome

Topical: hyperpigmentation (melasma, PIH,…

grades vary by outcome ↓

Small molecule (non-peptide)

also called — nicotinamide · vitamin B3 · NAM · 3-pyridinecarboxamide · INCI: Niacinamide

skin appearance (cosmetic)barrier supporthyperpigmentation appearanceantioxidantsebum appearance

Niacinamide is a lawful cosmetic ingredient worldwide. Vallydia uses it in cosmetic serums at concentrations supported by clinical trials (2–10%) with appearance-only claims. Reference science below includes both topical cosmetic and higher-dose oral / medical uses; only topical cosmetic use is relevant to the sellable product.

In brief

Niacinamide (nicotinamide, vitamin B3) is one of the best-evidenced cosmetic active ingredients. Multiple independent controlled human trials show measurable improvement in skin appearance related to hyperpigmentation, barrier function (reduced TEWL), and — at higher concentrations — fine lines and sebum. Effect sizes are modest compared with prescription retinoids or hydroquinone, but tolerability is much better and it plays well with almost every other active. It is a cornerstone cosmetic ingredient, not a hero molecule.

Legal standing, by region

International

Lawful cosmetic ingredient

Topical Niacinamide is a lawful cosmetic ingredient globally, including EU (Regulation (EC) 1223/2009), UK, US, and Asia. CosIng-listed. No concentration ceiling in the EU cosmetic framework; consumer formulas typically use 2–10%. Not a controlled or restricted substance.

Evidence, by outcome

How we grade →

An honest grade per outcome — drawn from the evidence, not any catalogue. Hype and undemonstrated marketing claims grade low.

OutcomeEvidence base · effectGrade

Topical: hyperpigmentation (melasma, PIH, age spots) at 2–5%

Smaller than hydroquinone in head-to-head trials; better tolerated; typically requires 8+ weeks of twice-daily use

Multiple double-blind, split-face, vehicle-controlled RCTs (Hakozaki 2002 n=18 and n=79 dose-response; Kimball 2010; 2005 sallowness split-face n=~200); recent 2025 narrative reviews confirm consistent effect · Measurable reduction of melanin transfer to keratinocytes; visible skin-tone improvement over 8–12 weeks

A

Barrier function / TEWL (2–5%)

Formulation and vehicle matter; mechanism robust in vitro and in vivo

Controlled trials showing measurable ceramide/free fatty acid synthesis increase and TEWL reduction; Kimball 10-week trial with 4% NAM + N-acetylglucosamine · Improved stratum corneum integrity, reduced water loss

A

Fine lines and appearance of photoaging (5–6%)

Smaller than tretinoin/retinoids; multi-active formulations make isolated effect hard to prove

RCT of 6% niacinamide formulation reporting ~15% fine-line reduction; JAAD split-face sallowness study · Modest visible improvement in appearance of fine lines and texture

B

Sebum/oiliness reduction (2–4%)

Effect modest; some trials mixed; regional variability (better in Asian studies)

Multiple controlled trials at 2% and 4% for 2–4 weeks · Measurable reduction in sebum excretion rate

B

Acne vulgaris (topical 4%)

Consumer skincare framing: use as appearance/comfort adjunct, not medicine

Randomized trials vs clindamycin 1%; comparable efficacy on inflammatory lesions · Reduction in inflammatory lesion count

B

Systemic / oral high-dose "anti-aging" claims

Systemic dosing outside cosmetic scope; do not conflate oral clinical data with topical serum claims

Small metabolic studies; oral NAM supplementation for photoprotection · Oral 500 mg BID reduced non-melanoma skin cancer incidence in ONTRAC trial; unrelated to cosmetic topical claims

D

"High-strength 10%+" superiority over the proven 2–5% range

The comparison exists in humans — 2%, 5% and 10% tested on sebum and hydration — and 10% did not beat 5%. Every controlled result graded on this page sits at 2–6%. The extra strength adds flushing and tingling, not proportionate benefit.

Marketing claim

D

Safety (topical)

Occasional mild flushing/tingling at higher concentrations; rare contact reactions; concentrations >10% not shown to add benefit

Decades of widespread cosmetic use; controlled trials · Generally well tolerated

—

Disclosure

Vallydia sells its own cosmetic serums, and some ingredients graded here belong to the same categories as those products. Grades are drawn from the published evidence by the method we publish, and applied to our own ingredients on the same terms — our copper-peptide serum is graded no more kindly than the peptides it competes with. We disclose the interest so you can weigh it.

Trade names shown here (for example Matrixyl, Argireline, Syn-Ake) are the property of their respective owners and are used only to identify the ingredient under discussion. Their appearance implies no affiliation with, or endorsement by, the proprietor.

Evidence changes

Get notified if this changes

We track new research and update these grades as the evidence moves. Leave your email and we'll tell you if the evidence for Niacinamide (Vitamin B3) changes - nothing else.

Cosmetic claims boundary

✓ Allowed (appearance / feel)

for the appearance of a more even, brighter-looking complexion
helps improve the look of uneven skin tone
supports the appearance of a healthy skin barrier
for the look of smoother, more refined-looking skin
antioxidant

✕ Not allowed (medicinal)

treats melasma
treats hyperpigmentation
treats acne
inhibits melanogenesis
repairs the skin barrier
stimulates ceramide synthesis
reduces inflammation
anti-inflammatory
prevents skin cancer
reverses photoaging

The medicinal-sounding science stays in the reference section; product copy speaks only to appearance/feel (Reg 655/2013). Different fields, never merged.

Identity

a water-soluble amide form of vitamin B3 (pyridine-3-carboxamide). It is the biologically active form used by the body to synthesise NAD+ and NADP+ — coenzymes central to cellular energy metabolism, DNA repair, and hundreds of enzymatic reactions. In skincare it is applied topically as a small, stable, well-tolerated molecule.

Development & history

Recognised as an essential nutrient in the 1930s (as part of the vitamin B complex, curing pellagra).
Studied for cosmetic and dermatological uses since the 1970s.
Emerged as a mainstream cosmetic active in the early 2000s, driven by Procter & Gamble research (Hakozaki, Bissett) demonstrating measurable effects on pigmentation, barrier, and skin appearance.
Today it is one of the most-studied and most-used cosmetic ingredients, appearing in serums, moisturisers, sunscreens, and treatment products across every price tier.

Mechanism (as proposed)

a small hydrophilic molecule that penetrates the stratum corneum readily. In keratinocytes it acts as a precursor to NAD+/NADP+, supporting cellular energy and repair. Documented mechanisms relevant to skin appearance include: reduced melanosome transfer from melanocytes to keratinocytes (mechanism behind the pigmentation effect); increased synthesis of ceramides and free fatty acids in the stratum corneum (mechanism behind the barrier effect); modulation of sebaceous lipogenesis; and antioxidant activity through NAD+-dependent enzymes.

Related reading

When a niacinamide routine underdelivers, and the usual reasons why: why your niacinamide isn't working.
Head-to-head with the pigment active it is most often weighed against: azelaic acid vs niacinamide.

Scan your productSee if Niacinamide (Vitamin B3) is in what you're usingOpen the scanner →

Chemical identifiers

Cross-reference identifiers for the authoritative external databases — not a recipe, and nothing about how to use it.

PubChem CID936

InChIKeyDFPAKSUCGFBDDF-UHFFFAOYSA-N

SMILESC1=CC(=CN=C1)C(=O)N

UNII25X51I8RD4

ChEMBLCHEMBL1140

DrugBankDB02701

via PubChem exact-name match (Niacinamide) · high confidence

Sources — 6 cited

01Hakozaki T, et al. The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer. Br J Dermatol. 2002; 147(1):20-31.

02Bissett DL, et al. Topical niacinamide reduces yellowing, wrinkling, red blotchiness, and hyperpigmented spots in aging facial skin. Int J Cosmet Sci. 2004; 26(5):231-8.

03Kimball AB, et al. Reduction in the appearance of facial hyperpigmentation after use of moisturizers with a combination of topical niacinamide and N-acetyl glucosamine. Br J Dermatol. 2010; 162(2):435-41.

04Marques C, et al. Mechanistic Basis and Clinical Evidence for the Applications of Nicotinamide (Niacinamide) to Control Skin Aging and Pigmentation. Antioxidants (Basel). 2021; PMC8389214.

05Sadler K, Kubiak K. Clinical Evaluation of Niacinamide in Hyperpigmentation and Barrier Repair. J Cosmo Tricho. 2025; 11:308.

06Topical Niacinamide in Daily Skincare: A 3-Week Real-World Cosmetic Study. Appl Sci. 2025; 15(17):9729.

Updated 2026-07-20

Grades reflect the published evidence, not our interest. No dosing, reconstitution, or administration is published for research compounds — that restraint is deliberate.

Related compounds

GHK-Cu Peptide (Copper Tripeptide-1)B

Matrixyl (Palmitoyl Pentapeptide-4)B

Argireline (Acetyl Hexapeptide-8)C

Explore by goal

Skin & aesthetic →

A neutral reference and a lawful-lane shop. Information for those who seek it — never promotion.

Region — International

ExploreRegister The Register — full index Categories Trust & COA How we grade Open data Brands

ShopCosmetic peptides Journal Quizzes

TermsPrivacyCookiesReturnsShippingImprint

This site provides neutral scientific reference and sells only products lawful in your region. Nothing here is medical advice, a recommendation, or an offer to supply unapproved medicines. No dosing or administration is published for research compounds. Cosmetic peptides per Regulation (EC) 1223/2009. Unapproved injectable peptides are neither sold nor advertised in the EU (Directive 2001/83/EC, Title VIII). © 2026 Vallydia.