COSRX The Niacinamide 15 Serum vs One Thing Niacinamide 10%
Same shelf, different answers — here's the whole picture in one table. Click either product for full ingredient decode, skin-twin reviews and every retailer's landed cost.
| COSRX The Niacinamide 15 Serum | One Thing Niacinamide 10% | |
|---|---|---|
| Step | Serum | Serum |
| Price | $23 | $18.96 |
| Best landed cost | $23 | $27.76 |
| Rating | ★ 4.4 (2,900) | ★ 5 (28) |
| Evidence grade | B | B |
| Korea signal | #18 serum · Olive Young Korea (seed) | — |
| Hero ingredients | Niacinamide, Zinc PCA | Niacinamide |
| Best for | Dark spots (PIH), Pores & Oil | Dark spots (PIH), Pores & Oil, Dullness |
| Skin types | Oily, Combination, Normal | Oily, Combination, Normal, Dry |
| Texture | light | light |
| Tone note | All tones | All tones |
| Fragrance-free | ✓ | ✓ |
| Fungal-acne safe | ✓ | ✗ |
| US stock | ✓ | ✗ import only |
Our read: Evidence grades are equal (B) — so let fit decide: check the skin-type rows above, and if both fit, COSRX The Niacinamide 15 Serum is the cheaper landed cost over One Thing Niacinamide 10%.
Prices and rankings are seed data pending weekly verification. Take the 60-second quiz and both products get a personal match score on their pages.