Niacinamide in Korean Skincare: What It Does and Who It Suits
A guide to INCI Niacinamide — the vitamin B3 derivative that brightens, balances oil, supports the skin barrier, and appears in almost every K-beauty category.
Niacinamide (INCI: Niacinamide), also called nicotinamide or vitamin B3, is one of the most widely used actives in Korean skincare. It is formulated to brighten uneven tone, control sebum, support the skin barrier, and refine the appearance of pores — all in a single water-soluble ingredient that suits most skin types, at concentrations ranging from around 2% to 20%.
Who should read this
If you are working through any skin concern that touches on uneven tone, excess oil, post-blemish marks, or a weakened moisture barrier — niacinamide is probably already in several products you own, or should be. This guide explains exactly what the ingredient does at a formula level, how it shows up across niacinamide Korean skincare categories, and which Kayty products to look at first depending on your goals.
What Niacinamide is
Niacinamide (nicotinamide) is a white, crystalline powder, freely soluble in water and in ethanol, and a derivative of vitamin B3 — a multi-talented ingredient. Its INCI name is simply Niacinamide, and you will see it written as 나이아신아마이드 on Korean packaging.
It is a water-soluble vitamin that usually comes in white powder form, and the version used in cosmetics is produced exclusively synthetically. That matters for formulation: it has great thermal stability and works on a wide range of pH levels (pH 3–10), which makes it one of the more forgiving actives to work with and explains why it appears in so many different product categories — from watery toners to thick body lotions.
Its cosmetic functions span skin brightening, pigment reduction, barrier protection, sebum control, skin soothing, anti-aging, hydration, and skin conditioning, and it is permitted for use in eye products.
What it does in a formula
Niacinamide works across several mechanisms at once, which is part of why it has become such a fixture.
Barrier and hydration. It is formulated to help strengthen the skin barrier, protecting against environmental stress, and reducing the appearance of fine lines and wrinkles. It is used to help the skin barrier maintain balanced levels of water and oil, allowing it to function and keep the complexion looking healthy and feeling hydrated.
Tone and pigmentation. Niacinamide works to prevent melanin from reaching the skin's surface, inhibiting the transfer of melanin-containing melanosomes to keratinocytes of the epidermis. This is the mechanism behind its use in dark spot serums and brightening ampoules.
Sebum and pore appearance. It helps even out the look of skin tone and refine the appearance of pores. For oilier skin types, this makes it useful both as a standalone serum and as a supporting ingredient in mattifying formulas.
Concentration matters. Studies have explored its various benefits at concentrations ranging from as low as 0.2% to as high as 20%. In practice, 2–4% niacinamide is well suited to beginners, sensitive skin, or anyone layering it with other actives, and is found in toners, essences, and daily moisturizers. 10% and above is best reserved for stubborn concerns like persistent oiliness, visible pores, or dark spots that haven't responded to a lower-strength serum, and works best for skin that already tolerates the ingredient well.
