Niacinamide for Skin: Barrier, Brightness, and the Research
Skincare Science · 2026
Niacinamide for Skin: Barrier, Brightness, and the Research
Few cosmetic ingredients have as broad a research base as niacinamide. From early studies on melanosome transfer to recent work on stratum-corneum integrity, here is what dermatology literature actually shows.
What niacinamide is
Niacinamide (also called nicotinamide) is the amide form of vitamin B3. In skincare it is well-tolerated, water-soluble and stable across a broad pH range — a useful property in formulation. Topical concentrations in cosmetic products typically range between 2% and 10%.
Brightness and pigmentation
A foundational 2002 paper in the British Journal of Dermatology by Hakozaki and colleagues reported that niacinamide reduced cutaneous pigmentation and suppressed melanosome transfer from melanocytes to keratinocytes — the cells that hold pigment in the upper skin layers.[1] Subsequent in-vivo work showed niacinamide produced visible brightening of facial hyperpigmentation in clinical use.
Skin barrier and stratum-corneum integrity
Niacinamide's effects on the skin barrier are equally well documented. A 2005 paper in Dermatologic Surgery by Bissett described how topical niacinamide visibly improved fine lines, hyperpigmentation, redness and yellowness in aging facial skin.[2] A 2013 study in the International Journal of Pharmaceutics reported that niacinamide-containing formulations modulated molecular and biophysical properties of the stratum corneum — the outermost protective layer of skin.[3] Two randomised controlled comparative studies published in 2012 in the Journal of Drugs in Dermatology showed that body lotions containing niacinamide and glycerin improved barrier-function metrics over comparator products.[4]
Why barrier matters
An intact skin barrier reduces transepidermal water loss, holds onto natural moisturising factors, and helps the skin tolerate other actives like vitamin A and exfoliating acids. This is one reason niacinamide is so commonly paired with retinoids — it can support tolerability without compromising the actives' effects.
Niacinamide in Medik8's line
Medik8®'s newly launched Niacinamide Peptides® serum combines niacinamide with peptide complexes. Beyond niacinamide, the brand's Calmwise® range targets sensitive and reactive skin with redness-supporting actives. As an authorised NZ Medik8® stockist, Verdo carries both.
How to use niacinamide
- Morning or evening — niacinamide is non-photosensitising and tolerated by most skin types.
- Apply after cleansing, before moisturiser.
- Layers easily with other actives including retinoids and vitamin C, contrary to older internet myths.
- Patch test if your skin is highly reactive — niacinamide is well tolerated but flushing can occur in rare cases.
Featured Medik8® niacinamide and calming products
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Authentic Medik8® delivered fresh from your authorised NZ stockist.
Shop Niacinamide Peptides® →References
- Hakozaki T et al. (2002). The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer. Br J Dermatol. View
- Bissett DL et al. (2005). Niacinamide: A B vitamin that improves aging facial skin appearance. Dermatol Surg. View
- Mohammed D et al. (2013). Influence of niacinamide containing formulations on the molecular and biophysical properties of the stratum corneum. Int J Pharm. View
- Christman JC et al. (2012). Two randomized, controlled, comparative studies of the stratum corneum integrity benefits of two cosmetic niacinamide/glycerin body lotions. J Drugs Dermatol. View
