The Vitamin C 23 Serum
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COSRX The Vitamin C 23 Serum scores 6.3/9.8 overall. It ranks highest in low irritation risk (9.5) and formulation safety (9.0).
✶ Hero ingredients
Pure vitamin C antioxidant
Draws in moisture
Works on your skin
Score breakdown
Estimated — based on ingredient analysis. Scores refine as user reviews are added.
Scores last verified: July 2026
What makes COSRX The Vitamin C 23 Serum stand out
COSRX The Vitamin C 23 Serum is a decent serum with an overall score of 6.3/9.8. Positioned in the budget bracket, it takes a straightforward approach to skincare. The formula leads with Ascorbic Acid, Propanediol, Ethyl Ascorbyl Ether — ingredients that actively target skin concerns.
It performs well on low irritation risk (9.5). On the flip side, hydration could be stronger and active ingredient concentration is on the lighter side.
Is this right for you?
Great for
- ✓Sensitive skin — low irritation risk with a gentle formulation
- ✓Safety-conscious shoppers — clean formulation with minimal flags
- ✓Ingredient-aware buyers — transparent, well-documented formula
May not suit
- ⚠Very dry skin types looking for heavy-duty moisture
Key ingredients
- ✶Ascorbic Acid
Works on your skin — #1 in the INCI list
- ✶Propanediol
Draws in moisture — #3 in the INCI list
- ✶Ethyl Ascorbyl Ether
Works on your skin — #4 in the INCI list
- ✶Panthenol
Draws in moisture — #5 in the INCI list
- ✶Sodium Lactate
Draws in moisture — #6 in the INCI list
Full ingredient list
11 ingredients — listed in INCI order (highest concentration first)
Compare with similar products
- Lancôme Renergie C.R.X. Triple Serum Retinol9.7
- INNBEAUTY PROJECT Pro C Serum Brightening Solution with 15% Vitamin C + Ferulic Acid9.7
- innisfree Vitamin C Brightening Serum-Infused Mask for Dark Spots9.7
- Skinfix barrier+ Triple Lipid Activating Serum With Plumping Peptides and Niacinamide9.6
- innisfree Gentle Retinol + Salicylic Acid Acne Serum for Blemishes + Post-Acne Scars9.6
Ingredient breakdown
- Draws in moisture4
- Works on your skin3
- Keeps the product fresh2
- Other ingredient1
- Formula balancers1