Niacinamide — the ingredient Korean regulation put in every third product
Niacinamide (vitamin B3) appears in 2,687 of 7,878 cataloged Korean products — 34.1%.
Last reviewed 28 August 2026.
Niacinamide (vitamin B3) appears in 2,687 of 7,878 cataloged Korean products — 34.1%. There’s a regulatory reason: Korea’s functional-cosmetics system officially recognizes niacinamide as a brightening ingredient at set concentrations, so adding it lets a product carry the coveted 미백 기능성 (brightening functional) label. Knowing that decodes a lot of Korean packaging.
What it is
A stable, water-soluble form of vitamin B3. One of the most-studied cosmetic ingredients globally, used across brightening, oil-balance, and barrier-support formulations.
What it’s used for
In Korea, first and foremost: functional certification. Products formulated with the notified concentration can print “미백 기능성화장품” — an official claim category regulated by the MFDS, not marketing fluff. Beyond the label game, formulators use it for tone-evenness and general skin-condition support. (What it does for your skin depends on your skin — no ingredient guarantees an outcome, and this site doesn’t score ingredients as good or bad.)
In the Korean market
34.1% of the catalog, and uniquely spread: essences/serums (564) but also sunscreens (383) and creams (357) — sunscreen presence is a tell-tale of the functional-label strategy, since 미백+자외선차단 double-functional sunscreens are a Korean staple. Top partners: hyaluronic acid (926), ceramide NP (885), centella (770). Most-committed brands: Dr.G (54 products), Medicube (49), Mediheal (45).
Who tends to like it / who should be careful
Broadly tolerated at the concentrations common in Korean formulas. A minority of users report flushing or tingling with high-percentage serums — if that’s you, the many low-dose formulations (where it sits mid-label) are the gentler path.
On the label
나이아신아마이드. If the box carries 미백 or 기능성화장품 wording, this is very often the ingredient behind it — check where it sits in the list.