It's Skin Power 10 Formula VC Effector vs COSRX The Vitamin C 23 Serum
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.
It's Skin — Power 10 Formula VC EffectorFull breakdown →
COSRX — The Vitamin C 23 SerumFull breakdown →
| It's Skin Power 10 Formula VC Effector | COSRX The Vitamin C 23 Serum | |
|---|---|---|
| Step | Serum | Serum |
| Price | $12 | $25 |
| Best landed cost | $12 | $20 |
| Rating | ★ 4.2 (4,100) | ★ 4.4 (6,200) |
| Evidence grade | C | A |
| Korea signal | #53 serum · Olive Young Korea (seed) | #6 serum · Olive Young Korea (seed) |
| Hero ingredients | Vitamin C, Green tea | Vitamin C, Vitamin E |
| Best for | Dullness | Dark spots (PIH), Dullness, Aging |
| Skin types | Normal, Combination, Oily | Normal, Combination, Oily |
| Texture | light | light |
| Tone note | All tones | All tones |
| Fragrance-free | ✗ | ✓ |
| Fungal-acne safe | ✗ | ✗ |
| US stock | ✓ | ✓ |
Our read: COSRX The Vitamin C 23 Serum carries the stronger evidence grade (A); It's Skin Power 10 Formula VC Effector wins on landed cost. If your concerns match both, evidence is the tiebreaker we'd use.
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.