Products › Serum › COSRX The Vitamin C 23 Serum
The Vitamin C 23 Serum
The Vitamin C 23 Serum is middling — some recognized actives, but dosing or disclosure holds it back.
Actives pyramid
What's actually in it, ranked by how well it's dosed.
What it does
Evidenced benefit intensity, derived from dosed actives.
The receipt
Every point of this grade, traced to the active, its dose, and the evidence.
Vitamin C at 23% — strong dose
Above the ~15% where 10–20% L-ascorbic acid is photoprotective and brightens tone in clinical data.
Pros & cons
The honest tradeoffs.
- Vitamin C at a strong, research-backed dose (23%)
Best for
Who and when this fits.
Dupes & alternatives
Cheaper products in the same category that grade equal or higher.
B The Ordinary Ascorbic Acid 8% + Alpha Arbutin 2%$10
save 60% B Geek & Gorgeous C-Glow 15% Vitamin C Serum
$14.90
save 40% C The Ordinary Vitamin C Suspension 23% + HA Spheres 2%
$6
save 76% C Minimalist Vitamin C + E + Ferulic 16% Face Serum
$8
save 68%
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Get Visage VerifiedBased on published concentration thresholds and formulation science. Our algorithm predicts likely efficacy — it does not test the product. Individual results vary. Not evaluated by the FDA. You can't pay to move a grade — Visage Theory is paid only for optional audits and seal licenses, never to change a letter.