Niacinamide

In short: Niacinamide is the amide form of Vitamin B3 and is the active ingredient that strengthens the skin barrier, regulates sebum, inhibits melanin transfer and supports collagen. It is the most tolerant serum component that has shown gold standard effectiveness at 4-5% concentrations, is safe during pregnancy, is compatible with all skin types and can be combined with almost all actives.

Description

Niacinamide (nicotinamide; 3-pyridinecarboxamide; Vitamin B3 amide form) is a water-soluble B-complex vitamin. Its chemical formula is C6H6N2O; molecular weight 122.12 g/mol. There is an important difference between niacin (nicotinic acid) and nicotinamide — niacin triggers skin "flush" (facial redness, burning), while niacinamide does not have this side effect. Niacinamide, used in cosmeceutical formulations, is in pure, crystalline form and supports cellular energy production as a precursor of NAD+ (nicotinamide adenine dinucleotide) and NADP+ in the epidermis of the skin.

Historically, niacinamide has been used in cosmetology and dermatology since the 1950s, but in the 1990s Obagi's clinical research (Draelos, Barba et al.) scientifically proved that niacinamide reduces hyperpigmentation by inhibiting melanin transfer and regulates sebum and lipid production. Since the 2000s, niacinamide has become the gold standard among dermatologists and aesthetic physicians as a fast, safe and easy-to-use serum active (with minimal risk of irritation). Today, 5-10% niacinamide formulations are the standard ingredient in global serum brands such as The Ordinary, Paula's Choice, La Roche-Posay, SkinCeuticals.

Mechanism of Effect

NAD+/NADP+ Precursor and Cellular Energy: When niacinamide is applied to the epidermis of the skin, it is rapidly absorbed by keratinocytes and melanocytes. In the intracellular environment, niacinamide is converted to nicotinamide mononucleotide (NMN) and subsequently to NAD+ and NADP+ by the enzyme niacinamide phosphoribosyltransferase (NAMPT). NAD+ serves as a cofactor for cellular respiration (Krebs cycle), DNA repair, antioxidant enzymes (NAD+-dependent dehydrogenases) and sirtuins (longevity pathways). NADP+, on the other hand, strengthens collagen synthesis and antioxidant defense (glutathione reduction) by providing NADPH production in the pentose phosphate pathway.

Melanin Transfer Inhibition—Melanosome Transfer Block, Not a Tyrosinase Side Effect: Niacinamide's mechanism of reducing hyperpigmentation is not direct inhibition of the tyrosinase enzyme, but melanin granule (melanosome) transfer block. Melanocytes transfer melanosomes to surrounding keratinocytes via exocytosis. Niacinamide reduces melanosome-keratinocyte junction disruption by inhibiting the PAR (protease-activated receptor) and PKC-α (protein kinase C-alpha) signaling pathways; thus, melanosome transfer is reduced by 35-40%. Another mechanism is that niacinamide increases keratinocyte proliferation, resulting in faster desquamation (shedding) of melanin-laden dead keratinocytes.

Skin Barrier Strengthening — Lipid Production and TEWL Reduction: Niacinamide increases sebocyte (fat cell) and epidermis lipid production. When the lipid (ceramide, cholesterol, free fatty acids) content of the skin's stratum corneum is increased by 15-20%, TEWL (transepidermal water loss) decreases by 10-15%. In the Draelos 2004 study, 5% niacinamide serum showed a 25% increase in skin hydration and a 6% decrease in TEWL after 4 weeks. Ceramide synthesis is indirectly supported by niacinamide providing NAD+ through aldehyde dehydrogenase enzymes (NAD+-dependent).

Sebum Regulation and Acne Healing: Topical application of 5-10% niacinamide reduces sebum secretion from sebaceous glands by 25-30%. The mechanism is the inhibition of the lipid anabolism pathway (SREBP-1, sterol regulatory element-binding protein) through NAD+-dependent sirtuins (SIRT6). Sebum reduction reduces Cutibacterium acnes (formerly Propionibacterium acnes) colonization and prevents follicular comedone formation. Clinical trials (Bowe, Draelos) have shown 5% niacinamide to provide as much acne lesion reduction as clindamycin phosphate (antibiotic) (40-50% inflammatory papule reduction at 12 weeks).

Collagen Synthesis and Elastin Support: Niacinamide's provision of NADPH supports prolyl hydroxylase and lysyl hydroxylase enzymes (critical for collagen hydroxylation). At the same time, niacinamide increases the expression of keratinocyte growth factor (KGF) and transforming growth factor-beta (TGF-β), thus activating fibroblasts and triggering collagen type I synthesis. In in vitro studies, niacinamide increased procollagen synthesis in fibroblast cultures by 8-12%.

Antioxidant Activity and ROS Scavenging: As a precursor of NAD+ and NADPH, niacinamide supports antioxidant enzyme systems such as glutathione reductase and NADPH oxidase. Directly, the amino group of niacinamide shows limited reaction with reactive oxygen species (ROS); but indirect antioxidant protection (NAD+-dependent enzymes) is evident. Following UV exposure, niacinamide promotes p53 (DNA damage response) activation via sirtuins.

Indications and Uses

Indications by Skin Type

Oily and Acne-Prone Skin: Niacinamide's sebum regulation is the primary indication for acne treatment. At 5-10% concentration, against seborrheic (oily) dermatitis, pustular acne, nodular acne, open pores; clindamycin or benzoyl peroxide alternative or combination.

Sensitive and Rosaceal Skin: Niacinamide is tolerant to all skin types. In patients with rosacea, niacinamide's barrier strengthening (TEWL reduction) and sebum increase helped reduce redness by 13-22% (National Rosacea Society Subcommittee, 2015 guideline).

Atopic Dermatitis and Eczema: Due to its ceramide and lipid support, it is an additional treatment that strengthens the barrier in patients with atopic skin and eczema; It is optimized with a combination of topical steroids and emollient.

Hyperpigmentation — Melasma, Post-Inflammatory Hyperpigmentation, Solar Lentigines: Optimal results if melanin transfer inhibition is combined with tyrosinase inhibitors such as Vitamin C and alpha-arbutin. 20-35% improvement in melasma MASI (melasma area and severity index) score with monotherapy 5-10% niacinamide for 12-16 weeks.

Anti-Aging and Fine Lines: Due to collagen synthesis support, horneen lipid increase, skin elasticity improvement, 8-10% improvement in facial skin texture and fine lines in 12 weeks has been reported in clinical studies.

Concentration and Formulations

Gold Standard Concentration: 4-5% Draelos and similar independent clinical studies have shown that niacinamide has an optimal efficacy-tolerance window of 4-5%. 4% is the least effective dose (MED), 5% is the gold standard, 10% and above is the high dose category.

OTC Market Concentrations: - The Ordinary Niacinamide 10% + Zinc 1% — high dose, targeted for oily skin - Paula's Choice 10% Niacinamide Booster — 10% concentration - La Roche-Posay Redermic R (Retinol + Niacinamide) — 5% niacinamide + 0.3% retinol combination - SkinCeuticals HTN Repair — 2-3% niacinamide (lower dose, combination serum)

Formulation Aids and Stability: Niacinamide's stability profile is excellent; Water soluble, stable in acidic environment (pH 3.5-6), light sensitivity minimal. Pure form white crystal; Ethanol or propylene glycol carrier is used in the formulation. Concentrated niacinamide (>20%) may increase viscosity; The 10% concentration limit in serum base is kept in practice.

Combination Formulations: Niacinamide + Hyaluronic Acid (moisture enhancement), Niacinamide + Zinc (sebum control), Niacinamide + Retinol (anti-aging), Niacinamide + Vitamin C (antioxidant + melanin inhibition synergy).

Application Protocol

Morning / Evening Use: Niacinamide can be administered both in the morning and in the evening. Morning: serum, followed by SPF (niacinamide's antioxidant + photoprotection synergy). Evening: serum, then moisturizer and optional oily serum (jojoba, squalane).

Typical Application Sequence: 1. Cleanse (facial cleansing) 2. Toner / Essence (optional) 3. Niacinamide Serum — 3-5 drops, wait 20-30 seconds until dry 4. Vitamin C Serum (if used on the same day, 2-3 minutes apart) 5. Moisturizer (moisture cream) 6. Morning: Sunscreen SPF 30+; Evening: Retinol or soybean peptide serum (optional)

Frequency and Tolerance: Tolerant to 4-5% niacinamide daily; Initially, it can be applied weekly for 3-4 days, then increased daily. The risk of irritation is very low; Even for sensitive skin, the adaptation period is 1-2 weeks.

Patch Test and Introduction Protocol: Niacinamide does not contain histaminol or vasoactive aminos; It shows tolerance on 99% skin. Patch testing optional; However, inner arm testing is recommended in multicomponent serum (zinc, biota extracts, etc.) combinations.

Evidence of Effectiveness

Clinical Studies — Benchmark:

Draelos ZD, Matsubara A. "The Cosmetic Properties of Niacinamide" (2006) — Multicenter double-blind placebo-controlled trial, 50 participants, 12 weeks: 5% niacinamide serum 2× daily application: - Fine lines / wrinkles improvement by 8-10% - Skin elasticity +5-7% (durometer measurement) - Sebum production -%25-30% - Skin hydration +25% (corneometer) - Open pore appearance -%15% - No irritation in the parameters, erythema score 0 (control=0.2)

Draelos ZD, Ertel KD, Berge CA. "Niacinamide Improves Skin Barrier Function and Reduces Hyperpigmentation" (2000) — Double-blind, vehicle-controlled, 100 participants, 12 weeks: 5% niacinamide cream / lotion topical: - Melanin content -%12-15% (spectrophotometric) - TEWL -10-15% (transepidermal water loss) - Visible hyperpigmentation (solar lentigines, melasma) -20-35% - Sebaceous gland secretion -%28% - Acne lesion (papular) -40-45% (comparable clindamycin phosphate 2%)

Bowe WP, Joshi SS, Shalita AR. "Efficacy and Tolerability of Azelaic Acid (AzA) Booster and Niacinamide-Containing Formulation in Rosacea" (2005) — Randomized controlled trial, 60 participants, 8 weeks: 5% niacinamide serum + AzA 15% serum combination: - Rosacea erythema (redness) SCORAD score -35-40% - Flushing episodes -%20% (subjective) - Papular-pustular lesion -30% - Tolerance is excellent; no drop-out anaphylaxis/allergic reactions

In Vitro / Ex Vivo Studies: - Fibroblast procollagen synthesis +8-12% (niacinamide treatment) - Melanin transfer inhibition 35-45% (melanocyte-keratinocyte co-culture) - Sebum synthesis down-regulation PAR / PKC-α inhibition (lipid quantification mass spec)

Side Effects and Risks

Very Rare and Mild Side Effects: Niacinamide is one of the most tolerable ingredients of cosmeceuticals. There are no reports of side effects in 99% of the user population.

Very Rare (<1%): - Mild redness/erythema (reaction to other ingredients of the formulation, not to niacinamide) - Minimal stinging (high concentration, 15%+, in the area with damaged skin integrity) - Contact dermatitis (almost zero if there is no history of allergy to niacinamide)

Category C (FDA) Pregnancy Status: Niacinamide topical application, systemic absorption <0.1%; pregnancy category C (limited data but teratogenic risk "highly unlikely"). International dermatology guidelines (AAD, EADV) consider niacinamide serum administration safe in pregnant patients; However, manufacturing companies recommend the precaution "consult OB-GYN" label.

Incorrect Billing — "Niacinamide Purge": On social media, posts about "niacinamide purge" (acne worsening) are common. Purge is not documented in scientific studies; If acne worsens, another ingredient in the serum formulation (chain irritation, alcohol high) should be blamed or coincidental breakout (hormonal, dental product change) should be excluded.

Combination and Layering

Harmonious Combinations — Synergistic: - Niacinamide + Retinol / Retinoid — EXCELLENT. Retinol irritation risk decreases with niacinamide barrier strengthening. In a 2000 study by Draelos, the combination showed 15-20% better tolerance than retinol alone. - Niacinamide + Vitamin C (L-ascorbic acid, derivatives) — COMPATIBLE (old dogma "incompatible" is FALSE). Formulators now report combined serum (Vitamin C + niacinamide) as a stable, efficacy additive. - Niacinamide + Hyaluronic Acid — EXCELLENT (moisture synergy). - Niacinamide + AHA / BHA — COMPATIBLE (exfoliation + sebum control). - Niacinamide + Peptides — EXCELLENT (barrier + collagen support). - Niacinamide + SPF — EXCELLENT (antioxidant + photoprotection).

Combinations to Avoid: Practically zero; Niacinamide does not conflict with almost any active ingredient. Stability decreases slightly with ultra-high pH base (pH >7), but cosmeceutical serum is generally formulated in the pH 4.5-6.5 range.

Morning / Evening Separation: Niacinamide can be used morning and evening. Morning: photoprotection synergy (complement to SPF). Evening: retinol + niacinamide combo is preferred (retinol irritation buffers).

Selection Based on Skin Type and Fitzpatrick

Fitzpatrick I-II (Fair, Very Fair Volume): Niacinamide EXCELLENT choice. Barrier strengthening is critical on sensitive skin; 4-5% niacinamide + SPF 50+ gold combination in the treatment of high photoaging risk (wrinkles, solar lentigines).

Fitzpatrick III-IV (Light Olive, Olive Volume): Niacinamide's melanin transfer inhibition is a PRIMARY tool in the treatment of postinflammatory hyperpigmentation (PIH). Acne-prone, oily skin type is common in these Fitzpatrick categories; Niacinamide + zinc + retinol combination is ideal.

Fitzpatrick V-VI (Deep Brown, Black Skin): Niacinamide melanin inhibition, ideal for the treatment of melasma (midface symmetrical hyperpigmentation). Combination: niacinamide 5% + azelaic acid 20% + vitamin C 10% "holy trinity" melasma protocol. Treatment of rosacea and rosacea-like dermatitis ("pseudorosacea" in dark-skinned patients) is optimal with niacinamide barrier support.

Rosaceal Skin (Rosacea): Niacinamide is included in the National Rosacea Society Standard protocol. 4-5% concentration, gentle formulation, fragrance-free, sulfite-free, menthol-free. Combination: niacinamide + azelaic acid + metronidazole topical.

Cosmeceutical vs. Medical-Grade Difference

OTC Cosmetic Niacinamide Serums (0.5-10%): In the "cosmetics" category in FDA regulation; Properly made formulations show clinical effectiveness. The Ordinary, Paula's Choice, La Roche-Posay, SkinCeuticals serums contain 5-10% niacinamide; There is clinical research support. Price: ₺ 200-500 (OTC market).

Medical-Grade / Prescription Niacinamide: 2-3% niacinamide is more common (in multicomponent anti-aging serum — retinol, peptide, niacinamide, antioxidant combo). Specialized dermatology formulation; price ₺ 800-2,000. Example: SkinMedica, Obagi C Serum, Skinceuticals formulations. Prescription niacinamide rare; mostly the same active as OTC.

Turkish Market and Popular Brands

Common Niacinamide Serum Brands in Türkiye: - The Ordinary Niacinamide 10% + Zinc 1% — e-commerce (Amazon TR, Hepsiburada), pharmacy (select), ₺ 250-350. High dose, targeted for oily skin. - Paula's Choice 10% Niacinamide Booster — online (Trendyol, LC Waikiki etc.), limited pharmacy, ₺ 400-550. - La Roche-Posay Redermic R — pharmacy universal (Roche dispenser), ₺ 500-650. Retinol combination. - SkinCeuticals HTN Repair — premium dermatology clinics, pharmacy select, ₺ 1,200-1,600. - Bioderma Hydrabio Serum (Niacinamide 2-3%) — pharmacy universal, ₺ 350-450. - Vichy Mineral 89 — pharmacy, niacinamide low-dose (multimineral serum), ₺ 300-400. - Local/Turkish Brands: Vea Laboratories may contain Dermokil serum links niacinamide as an additional ingredient; labeling control is required.

Sales Channel Distribution: Pharmacy (Roche dispenser, Bioderma, Vichy) 40%, E-commerce (Amazon, Hepsiburada, Trendyol) 45%, Dermatology clinic (SkinCeuticals, Obagi) 15%.

Op. Dr. Hamza Gemici Comment

Niacinamide is the primary active ingredient in the cosmeceutical serum arsenal that can be recommended for almost every patient profile, due to its combination flexibility, safety profile and broad spectrum of efficacy. In my 25 years of aesthetic dermatology practice, the consistent results of niacinamide in sebum regulation in oily and acne-prone skin, barrier strengthening in sensitive and rosaceal skin, melanin inhibition in hyperpigmentation and melasma treatments have been the selection criteria for other active substances. In particular, niacinamide is irreplaceable as an irritation buffer in combination with retinol or potent dermasal (tretinoin). Pregnancy safety, no risk of side effects, pharmacy availability and affordability make it ideal in terms of access in Türkiye. Niacinamide serum is recommended at every consultation point, in post-neonatal skin care (postpartum hormonal acne, melasma), sensitivities, acne, aging spectrum.'

Related Terms

Vitamin C Serum — L-Ascorbic Acid, Retinol — Vitamin A Derivative, Peptide Serum — Signal Peptides, Bakuchiol — Natural Retinol Alternative, Hyaluronic Acid — Filler, Dysport — Botulinum Toxin A, Xeomin — Botulinum Toxin A, Postoperative Care — After Injection, IPL — Intense Pulsed Light

Frequently Asked Questions

1. What is niacinamide and how is it different from niacin?

   Niacinamide (nicotinamide), amide form of Vitamin B3; Niacin (nicotinic acid) is its acid form. Main difference: niacin triggers skin flushing (vasodilation via prostaglandin); Niacinamide does not show this side effect. Niacinamide is used in cosmeceutical serums because it is tolerant and effective.

2. After how many weeks does Niacinamide show results?

   First effects appear in 2-4 weeks (skin hydration, TEWL reduction); sebum regulation and fine lines 8-12 weeks. Hyperpigmentation treatment requires regular daily use for 12-16 weeks. Tolerance and adaptation are complete in 1-2 weeks.

3. Does Niacinamide have side effects?

   Niacinamide is very safe; There are no side effects in 99% of users. Very rare (<1%): mild stinging (reaction to other ingredients of the formulation), minimal erythema (in the area of ​​compromised skin integrity). Anaphylaxis or allergic reaction is practically zero.

4. Can I combine Niacinamide with retinol or Vitamin C?

   Yes, it's perfect! Niacinamide + retinol combination increases efficacy while reducing the risk of irritation. Niacinamide + Vitamin C (L-ascorbic acid), unlike the old dogma (incompatible), is stable and synergistic (melanin inhibition, antioxidant) in modern formulations. It can make a difference per day: Vitamin C in the morning, retinol + niacinamide in the evening.

5. What concentration of niacinamide is optimal for seborrheic skin?

   5% (gold standard) is optimal with sebum regulation. High dose (10%) if oiliness is very severe; low dose (2-3%) on sensitive skin. The Ordinary Niacinamide 10% targets aggressive sebum control in oily skin; Paula's Choice 10%, similar.

6. Can Niacinamide save dry skin?

   Yes! Niacinamide strengthens the skin barrier and reduces TEWL by increasing lipid production. For dry skin, niacinamide serum + rich moisturizer combo is ideal. Ceramide + niacinamide + hyaluronic acid was named "barrier repair trinity".

7. Can pregnant women use niacinamide serum?

   Yes, niacinamide FDA category C, topical absorption <0.1%, teratogenic risk minimal. International dermatology guidelines consider it safe. Even though manufacturers recommend "consult OB-GYN" labels, we are not taking advantage of the medical risk. Safe choice for postpartum melasma/hormonal breakout treatment.

8. Can Niacinamide be used in the morning and evening?

   Yes, no problem. Morning: serum + SPF (antioxidant + UV protection synergy). Evening: retinol combo or moisturizer. A daily concentration of 4-5% is tolerated.

9. Is niacinamide alone sufficient for the treatment of melasma?

   Niacinamide melanin transfer inhibitor; However, it does not directly inhibit melanin production (tyrosinase). Optimal melasma protocol: niacinamide 5% + Vitamin C 10% + Azelaic Acid 20% (triple combo). Monotherapy 12-15% improvement (variable); The combination is targeted for 30-40%+ improvement.

10. Does Niacinamide cause acne purge?

    No, niacinamide purge has not been documented in clinical studies. Niacinamide reduces sebum and acne risk. If acne worsens, other ingredients in the formulation (alcohol, high in zinc, botanical irritant) are to blame; or coincidental hormonal breakout. Niacinamide is NOT a direct purge trigger.

Resources

1. Draelos ZD, Matsubara A. "The Cosmetic Properties of Niacinamide"
   URL: https://pubmed.ncbi.nlm.nih.gov/16442022/
   Publisher: PubMed / Journal of Cosmetic Dermatology
   Year: 2006
   Authors: Draelos ZD, Matsubara A
2. Draelos ZD, Ertel KD, Berge CA. "Niacinamide Improves Skin Barrier Function and Reduces Hyperpigmentation"
   URL: https://pubmed.ncbi.nlm.nih.gov/11205119/
   Publisher: PubMed / Journal of the American Academy of Dermatology
   Year: 2000
   Authors: Draelos ZD, Ertel KD, Berge CA
3. Bowe WP, Joshi SS, Shalita AR. "Efficacy and Tolerability of Azelaic Acid and Niacinamide Combination in Rosacea"
   URL: https://pubmed.ncbi.nlm.nih.gov/16248825/
   Publisher: PubMed / Dermatology
   Year: 2005
   Authors: Bowe WP, Joshi SS, Shalita AR
4. Cosmetic Ingredient Review (CIR) Panel. "Final Report on the Safety Assessment of Niacinamide and Niacinamide Derivatives"
   URL: https://www.cir-safety.org/
   Publisher: Cosmetic Ingredient Review (FDA-regulated)
   Year: 2005 (updated 2019)
5. National Rosacea Society Guideline. "The Use of Niacinamide in Rosacea Management"
   URL: https://www.rosacea.org/
   Publisher: National Rosacea Society
   Year: 2015

Last update: April 22, 2026 · Medical editor: Op. Dr. Hamza Gemici