About this product
COSRX The Vitamin C 23 serum 20ml delivers 23% pure ascorbic acid — one of the highest concentrations available — for maximum brightening, antioxidant protection, and collagen stimulation. Reserved for experienced vitamin C users with built-up tolerance, as the high concentration can cause tingling or purging during initial use.
Best for all skin types, dull skin looking to address hyperpigmentation, loss of radiance, dullness — with a focus on maximum brightening.
Pro members get a personalised score on every product based on their skin profile.
Quick Stats
Key Ingredients
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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.
How to Use
- 1Apply 2-3 drops to face
- 2Allow to set before moisturizer
- 3Use morning 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% pure ascorbic acid (highest concentration); intensive brightening and antioxidant protection.
Based on published clinical literature and dermatological research.
Ingredient Analysis
Full Ingredient List (INCI)
3 ingredientsListed in order of concentration (highest first)
Ascorbic Acid (Vitamin C), Vitamin E, Ferulic Acid
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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.