Niacinamide (Vitamin B3)
Ingredient Library · Pigmentation & Barrier Science
INCI: Niacinamide | Also known as: Nicotinamide, Vitamin B3 | Solubility: Water-soluble
In brief: Niacinamide is a water-soluble vitamin B3 derivative investigated for supporting the skin barrier and improving the appearance of uneven skin tone. Its pigmentation-related mechanism is different from direct inhibition of melanin synthesis: studies indicate an effect on melanosome transfer between skin cells.
1. What is niacinamide?
Niacinamide (nicotinamide) is an amide form of vitamin B3. It is associated with cellular coenzyme pathways, including the NAD system, and is widely used as a cosmetic skin-conditioning ingredient. Its water solubility makes it straightforward to incorporate into many aqueous formulations, although suitability depends on the complete product architecture.
2. How does it work in pigmentation?
Melanin is synthesised inside melanocytes and packaged in structures called melanosomes. Those melanosomes are subsequently transferred to neighbouring keratinocytes, contributing to visible skin pigmentation.
In experimental models, niacinamide reduced melanosome transfer from melanocytes to keratinocytes. Importantly, the foundational Hakozaki study did not find direct inhibition of mushroom tyrosinase activity or melanin synthesis in cultured melanocytes under its tested conditions. This makes its primary proposed pigmentation mechanism distinct from ingredients that act mainly on melanin production.
3. What does the evidence show?
- Mechanistic evidence: Hakozaki and colleagues (2002) demonstrated reduced melanosome transfer in experimental models.
- Human evidence: The same publication reported improved measures of facial pigmentation in clinical studies using specific niacinamide-containing formulations.
- Combination evidence: Kimball and colleagues (2010) reported improvements in irregular facial pigmentation with a moisturiser containing niacinamide and N-acetyl glucosamine compared with its vehicle control.
Evidence limitation: These results apply to the investigated products, doses and study populations. They do not establish identical performance from every finished formulation containing niacinamide.
4. Formulation science: why the vehicle matters
Niacinamide is highly water-soluble and is ordinarily incorporated into a formulation's aqueous environment. Its stability, compatibility and performance must be evaluated within the full formulation, including pH, processing conditions, packaging and storage.
In structured delivery systems, increasing the concentration of a dissolved ingredient can also alter phase behaviour and physical stability. A higher label concentration therefore does not, by itself, demonstrate superior topical availability or finished-product results.
At Micellar Cosmetics™, the scientific principle is to assess ingredient identity, concentration and formulation architecture together, not to assume that ingredient percentages are directly comparable across dissimilar vehicles.
5. Benefits, tolerability and limitations
Niacinamide is used in cosmetics for skin conditioning, barrier-related functions and helping improve the appearance of uneven skin tone. Individual tolerability varies, especially in complex routines. It is not a substitute for broad-spectrum sun protection and cosmetic products should not be presented as medical treatments for melasma or other diagnosed disorders.
6. How does it complement other ingredients?
N-acetyl glucosamine (NAG) is a relevant complementary ingredient because controlled studies have examined their combined use. Antioxidants and barrier-supporting ingredients may provide other complementary functions, but the suitability of any combination must be assessed in the finished formulation.
7. Related learning
ICEP Journal: Why Treating Uneven Skin Tone Requires More Than One Ingredient (scheduled for 15 November 2026; link to be activated following publication).
Related ingredient profiles: N-Acetyl Glucosamine (NAG), Tranexamic Acid (TXA), and Sodium Ascorbyl Phosphate (SAP).
8. Scientific references
- Hakozaki T, et al. (2002). The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer. British Journal of Dermatology 147:20–31. PubMed PMID 12100180.
- Kimball AB, et al. (2010). Reduction in the appearance of facial hyperpigmentation after use of moisturizers with a combination of topical niacinamide and N-acetyl glucosamine: results of a randomized, double-blind, vehicle-controlled trial. British Journal of Dermatology 162:435–441. PubMed PMID 19845667.
Micellar Cosmetics™ Ingredient Library · Profile v01 · References reviewed 12 November 2026. Ingredient evidence is not a substitute for finished-product performance testing.