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Skincare

Niacinamide

A well-tolerated vitamin B3 derivative with controlled human evidence for modest improvements in visible photoaging, pigmentation, and skin-barrier function.

Moderate
Evidence rating
Evidence review

What the evidence says

A 12-week double-blind split-face trial in 50 women found that 5% niacinamide improved fine lines, hyperpigmented spots, texture, red blotchiness, sallowness, and elasticity versus vehicle. An eight-week trial in 30 women also reported improvement in periorbital wrinkles and skin-surface roughness with 4% niacinamide.[1][2]

Controlled pigmentation studies found that topical niacinamide reduced facial hyperpigmentation and melanosome transfer. In a small melasma trial, 4% niacinamide produced good-to-excellent improvement in 44% of participants versus 55% with 4% hydroquinone, with fewer and milder adverse effects; both groups also used sunscreen.[3][5]

The evidence is not limited to appearance. A human study found that topical nicotinamide increased stratum-corneum ceramides and free fatty acids and reduced transepidermal water loss, supporting a measurable barrier effect.[4]

Confidence remains moderate rather than strong. Trials are short, mostly involve women, and several were conducted or supported by manufacturers. The useful evidence centers on well-formulated 2% to 5% products; it does not show that fashionable 10% to 20% serums work better.[6][1]

These findings concern visible photoaging, uneven pigmentation, and barrier function. They do not establish prevention of skin cancer, reversal of intrinsic aging, or any whole-body longevity effect.[6][3]

Potential benefits

  • May modestly improve fine lines, uneven pigmentation, texture, and redness over several weeks.[1]
  • Can improve epidermal barrier lipids and reduce water loss from dry skin.[4]

Side effects and cautions

  • Local stinging, dryness, redness, or irritation can occur, although controlled trials generally report good tolerability.[6][2]
  • Evidence from one concentration or vehicle cannot be assumed to apply to every high-strength commercial serum.[6]
How we scored it

Evidence breakdown

Several small randomized split-face trials support 2% to 5% formulations, but short follow-up, predominantly female samples, and industry involvement limit confidence.

Clinical relevanceModerate

Trials measure visible wrinkles, pigmentation, texture, and barrier function.

Study qualityModerate

Randomized vehicle-controlled studies exist, but they are small and short.

Safety dataHigh

Topical niacinamide was generally well tolerated in the controlled studies.

References

Full source list

  1. Topical niacinamide reduces yellowing, wrinkling, red blotchiness, and hyperpigmented spots in aging facial skin

    International Journal of Cosmetic Science · 2004

  2. Evaluation of anti-wrinkle effects of a novel cosmetic containing niacinamide

    Journal of Dermatology · 2008

  3. The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer

    British Journal of Dermatology · 2002

  4. Nicotinamide increases biosynthesis of ceramides as well as other stratum corneum lipids to improve the epidermal permeability barrier

    British Journal of Dermatology · 2000

  5. A Double-Blind, Randomized Clinical Trial of Niacinamide 4% versus Hydroquinone 4% in the Treatment of Melasma

    Dermatology Research and Practice · 2011

  6. Niacinamide: a review on dermal delivery strategies and clinical evidence

    Drug Delivery and Translational Research · 2024