COSRX Advanced Pure Vitamin C 23% Serum with Vitamin E & Glutathione
🔥 #9 in Vitamin C Serums · New Premium Korean vitamin C serum with strong antioxidant synergy
COSRX Advanced Pure Vitamin C 23% Serum with Vitamin E & Glutathione
COSRX 3.6
#9
in Vitamin C Serums
$15.50 →
As of Jul 13, 2026
AI-estimated. See how we score. How we score Affiliate link — we may earn a commission
01 / Spec
Top features
Active PotencyL-ascorbic acid (pure)
Concentration23%
Supporting ActivesVitamin E (tocotrienol), Glutathione
COSRX Advanced Pure Vitamin C 23% Serum is a Korean skincare staple featuring 23% pure L-ascorbic acid paired with Vitamin E (tocotrienol) and glutathione for broad antioxidant coverage. The formula targets fine lines, uneven skin tone, and dullness with a lightweight, non-sticky finish. Recently reformulated to eliminate the characteristic scent while preserving potency, it requires shaking before use and refrigeration post-opening to prevent oxidation. Best suited for committed vitamin-C users willing to manage storage and application discipline. Competes directly with mid-tier Korean and prestige serums on concentration and price.
02 / Signals
Why it's hot
High-concentration C serum with proven antioxidant trio—trusted Korean formula.
- Value for money 94
- Review rating & velocity 86
- Community sentiment 84
- Brand reputation 86
- Search heat 82
- Est. return & defect rate 82
03 / Verdict
Pros & cons
Pros
- High 23% L-ascorbic acid concentration
- Vitamin C + E + glutathione triple antioxidant blend
- Lightweight, non-sticky application
- Improved scent profile vs. earlier batches
- Solid community recognition in K-beauty circles
- Good value per oz vs. luxury Western brands
Cons
- Requires refrigeration post-opening to prevent oxidation
- Needs shaking before each use (unstable formula)
- Can cause mild stinging in sensitive skin
- Limited long-term stability once opened
- Smaller 0.67 oz bottle limits shelf life
- Requires discipline with storage and handling
Active PotencyL-ascorbic acid (pure)
Concentration23%
Supporting ActivesVitamin E (tocotrienol), Glutathione
PackagingGlass dropper bottle
Size0.67 fl oz (20 mL)
Price Per Oz$23.13 (at $15.50 Prime deal)
FragranceMinimal/unscented (reformulated)
Skin TypeAll skin types, patch test recommended
Cruelty FreeYes (brand committed)
VeganYes
05 / Your take
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05 / Compare
Compare the best alternative
One useful head-to-head in Vitamin C Serums, with the rows most likely to separate the contenders.
Open full comparison → 
TruSkin Vitamin C Serum with Hyaluronic Acid & Vitamin E, 2 oz
Active Potency
23% L-ascorbic acid—high-potency pure form Strongest dose Sodium Ascorbyl Phosphate (stable, gentler derivative)
Formula Stability
Oxidation-prone; requires fridge + shaking Stable SAP form; glass bottle with dropper (fair oxidation resistance) Most stable
Gentleness & Tolerability
Generally well-tolerated; occasional sting in sensitive skin Well-tolerated; suits sensitive skin; minimal irritation reports Gentlest
06 / Rivals
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08 / Browse
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