COSRX vs iUNIK — side by side, no bias.
Our pick
Beta Glucan Power Moisture Serum
9/10 · iUNIK
| The Niacinamide 15% Serum | Beta Glucan Power Moisture Serum | |
|---|---|---|
| Brand | COSRX | iUNIK |
| Category | serum | serum |
| Editor Rating | 8.5/10 | 9/10 ★ |
| Category | serum | serum |
| Texture | Light, quick-absorbing serum typical of COSRX | Slightly viscous but watery serum that absorbs cleanly |
| Finish | bright, semi-matte | calm, hydrated without shine |
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| Verdict | COSRX big 2026 launch and a direct answer to The Ordinary 10% Niacinamide. The 15% concentration is on the high end of what most users can tolerate, but the minimalist formula and pH balance mean it actually feels usable. For pigmentation, visible pores, and sebum regulation, this is a strong workhorse serum at a fair price. | iUNIK signature product and one of the best-kept secrets in sensitive-skin K-beauty. 70% beta-glucan — a powerhouse humectant and soothing agent — combined with a minimalist supporting cast. The result is a serum that hydrates like hyaluronic acid but also calms reactive skin the way centella does. Cult favorite for a reason. |
