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 personalized score on every product based on their skin profile.
How to Use
- 1Apply 2-3 drops to face
- 2Allow to set before moisturizer
- 3Use morning only
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.
Routine Placement
Apply this serum & ampoule as step 5 in your routine.
Quick Stats
Key Ingredients
Ingredient Analysis
Disclaimer: Ingredient information is for educational purposes only and does not constitute medical or dermatological advice. Sources: EWG Skin Deep, EU CosIng, NIH PubChem.
Dermatologist Note
23% pure ascorbic acid (highest concentration); intensive brightening and antioxidant protection.
Based on published clinical literature and dermatological research.
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.
Ingredient Analysis
Disclaimer: Ingredient information is for educational purposes only and does not constitute medical or dermatological advice. Sources: EWG Skin Deep, EU CosIng, NIH PubChem.
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Disclaimer: Information on this page is for educational purposes only and does not constitute medical or dermatological advice. Always patch test new products and consult a qualified professional if you have skin concerns. Skinuity does not sell any products. We provide affiliate links to third-party retailers and may earn a commission on qualifying purchases.