COSRX The Niacinamide 15 Serum vs The Ordinary Niacinamide 10% + Zinc 1%
COSRX
The Niacinamide 15 Serum
From $17.5· 20ml
NiacinamideSodium PCA
The Ordinary
Niacinamide 10% + Zinc 1%
From $6· 30 ml
Niacinamide
Actives breakdown
| Active ingredient | COSRX | The Ordinary |
|---|---|---|
| Niacinamide | Yes | Yes |
| Sodium PCA | Yes | No |
Layering & Safety
Combined Verdict
Safe to layer
No layering conflicts flagged between these two. Patch-test new actives as usual.