Advanced The Vitamin C 23 Serum
Pure vitamin C 23% serum with hyaluronic acid
About this product
COSRX Advanced The Vitamin C 23 Serum 20ml delivers a high-potency 23% pure ascorbic acid concentrate to maximally brighten hyperpigmentation, fade dark spots, and boost antioxidant protection. The anhydrous (water-free) formulation preserves vitamin C stability and is recommended for experienced vitamin C users.
Best for normal, combination, oily skin looking to address brightening, dark spots, hyperpigmentation — with a focus on brighten & fade dark spots fast.
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Quick Stats
Key Ingredients
Alternatives
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Product Claims
Common Allergens
Based on confirmed product attributes. Always check the full ingredient list for personal allergens.
Always check the full ingredient list if you have known allergies or sensitivities.
pH Level
Highly acidic — effective for exfoliation. Avoid layering with alkaline products.
How to Use
- 1Apply to clean, dry skin
- 2Use 2-3 drops on face
- 3Wait 15 min before moisturizer
- 4Use AM or evening only
Patch Test Recommended
This product contains high-strength actives. Before full application, apply a small amount to your inner arm or jaw and wait 24 hours to check for irritation.
If you experience redness, burning, or itching — discontinue use and consult a dermatologist.
Dermatologist Note
23% ascorbic acid; includes stabilizers; vitamin E + H.A. included
Based on published clinical literature and dermatological research.
Ingredient Analysis
Full Ingredient List (INCI)
3 ingredientsListed in order of concentration (highest first)
Ascorbic Acid, Sodium Hyaluronate, Niacinamide
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Disclaimer: The information on this page is for informational purposes only and does not constitute medical or dermatological advice. Always do your own research, consult a qualified professional if you have concerns, and patch test new products before full application — especially if you have sensitive or reactive skin.