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Skin Actives

Niacinamide

Also known as: Nicotinamide, Vitamin B3, Nicotinic acid amide

A form of vitamin B3 that repairs the skin barrier, brightens tone, and calms breakouts — the most versatile skincare active.

  • By IngredientWiki Editorial Team
  • Fact-checked by IngredientWiki Editorial Team
  • Updated 2026-09-25
  • 2 min read

In short

Niacinamide is a water-soluble form of vitamin B3 used both as an oral supplement and, more famously, as a skincare ingredient. As a precursor of NAD+ and NADP, it supports cellular energy in every cell of the body. In skincare, concentrations of 2–10% improve the skin barrier, regulate oil production, fade hyperpigmentation, and reduce inflammation — making it one of the most evidence-backed actives in modern cosmetics.

  • Water-soluble form of vitamin B3; precursor of NAD+/NADP
  • Topical concentrations of 2–10% are well tolerated by most skin types
  • Strongest evidence: acne, barrier repair, and dark-spot fading
  • Plays well with other actives, including retinol and hyaluronic acid

What is Niacinamide?

Niacinamide is the amide form of vitamin B3 — the same nutrient that prevents pellagra, a historic niacin-deficiency disease. Every cell needs it: the body converts niacinamide into NAD+ and NADP, coenzymes essential to energy production and DNA repair. That dual identity explains why it appears in multivitamins and in half the serums on the skincare shelf. Topically, it is one of the best-studied cosmetic actives, with trials going back to the 1990s and a remarkable tolerance record across skin types.

Where it comes from

Natural sources

  • Meat, poultry, and fish
  • Peanuts, whole grains, and mushrooms
  • The body can make it from dietary tryptophan

How it's made

Cosmetic-grade niacinamide is produced synthetically in crystalline powder form.

What it does in products

  • Supports the skin barrier by boosting ceramide synthesis
  • Regulates sebum (oil) production
  • Interferes with pigment transfer to reduce dark spots
  • Anti-inflammatory and antioxidant action
  • Cellular energy support as an NAD+ precursor

Benefits

Acne and oil control

strong evidence

Multiple controlled trials show topical 2–5% niacinamide reduces acne lesions and sebum production, with results comparable to the antibiotic clindamycin in one classic 4% study — without bacterial resistance concerns.

Barrier repair and hydration

strong evidence

Niacinamide increases ceramide and free fatty acid levels in the stratum corneum and reduces transepidermal water loss, strengthening the barrier in sensitive and rosacea-prone skin.

Fading hyperpigmentation

strong evidence

By blocking the transfer of melanin from melanocytes to skin cells, 2–5% niacinamide visibly reduces dark spots and uneven tone in 4–8 weeks, with a stronger evidence base than many pricier brightening actives.

Fine lines and photodamage

moderate evidence

Trials in photodamaged skin show modest improvements in fine lines, elasticity, and redness over 8–12 weeks of twice-daily use.

Side effects & safety

Mild stinging or redness at first use (uncommon)Usually fades within days; buffering with moisturizer or dropping to a 2–5% formula helps.
Flushing with high-dose oral niacinamide (rare)True niacin flush is mainly caused by niacin (nicotinic acid), not niacinamide, but high oral doses can still cause GI upset.

Safety considerations

  • Topical niacinamide is widely regarded as safe during pregnancy and is a common recommendation as a retinol alternative.
  • Pairs well with retinol, hyaluronic acid, and sunscreen; no known incompatibilities with common actives.
  • Avoid layering with very low-pH formulas (e.g., strong vitamin C serums) in the same routine step to prevent potential irritation.
  • Not for: Known allergy to niacinamide (rare)

How it's used

In supplements

As an oral supplement, niacinamide appears in B-complex and multivitamins. The adult upper limit for supplemental nicotinamide is 35 mg per day per the NIH Office of Dietary Supplements.

In skincare

Topical products range from 2–10%; 4–5% is the sweet spot backed by most trials. Apply once or twice daily, morning or night, before moisturizer and always followed by sunscreen in the daytime.

Regulatory status

  • Dietary supplement under DSHEA when oral; cosmetic ingredient under the FD&C Act (as amended by MoCRA) when topical — cosmetics do not require FDA pre-market approval.
  • GRAS (generally recognized as safe) for food use.
  • INCI name on cosmetic labels: Niacinamide.
  • The Cosmetic Ingredient Review Expert Panel has assessed niacinamide as safe in cosmetics at concentrations up to 10%.

Popular products containing Niacinamide

  • Niacinamide 10% + Zinc 1% — Best-selling oil-control serumThe Ordinary · skincare
  • PM Facial Moisturizing Lotion — Barrier cream with niacinamide + ceramidesCeraVe · skincare
  • Toleriane Double Repair Face MoisturizerLa Roche-Posay · skincare

Product names and brands are shown for reference and belong to their respective owners.

Niacinamide vs niacin: same vitamin, different molecules

Niacin (nicotinic acid) and niacinamide (nicotinamide) are both vitamin B3, but their side-effect profiles differ sharply. Niacin causes the famous 'niacin flush' — harmless but uncomfortable skin reddening — and is used medically for cholesterol at high doses. Niacinamide does not cause flushing, which is why it is the B3 form used in skincare and in most multivitamins.

Frequently asked questions

Can I use niacinamide every day?

Yes. Niacinamide is gentle enough for twice-daily use and suits most skin types, including sensitive and acne-prone skin. Start once daily if your skin is reactive, then build up.

Can I use niacinamide with vitamin C?

Yes. The old worry about incompatibility (niacinamide + ascorbic acid forming niacin) applies mainly to certain high-temperature, low-pH combinations of pure forms in the same bottle. Using them in separate products or separate steps is widely considered safe and effective.

Does niacinamide help with pores?

It cannot change pore size — pores are fixed structures — but by reducing oil production and supporting the surrounding skin, it can make pores look smaller and less congested over several weeks.

The bottom line

Niacinamide is the rare skincare active that is both extremely well studied and extremely well tolerated. For acne, barrier repair, and dark spots, 2–10% topical niacinamide is an evidence-first choice that fits into almost any routine.

References

  1. Niacin — Health Professional Fact Sheet. NIH Office of Dietary Supplements. https://ods.od.nih.gov/factsheets/Niacin-HealthProfessional/
  2. Topical nicotinamide research literature. PubMed (National Library of Medicine). https://pubmed.ncbi.nlm.nih.gov/?term=topical+nicotinamide+acne
  3. Niacinamide compound summary. PubChem (National Library of Medicine). https://pubchem.ncbi.nlm.nih.gov/compound/936
  4. Cosmetic Ingredient Review — niacinamide safety assessment. Cosmetic Ingredient Review. https://www.cir-safety.org/ingredients