About this product
COSRX The Vitamin C 13 serum 20ml contains 13% pure ascorbic acid in an anhydrous formula to brighten hyperpigmentation, neutralise free radicals, and stimulate collagen production. Designed for intermediate vitamin C users ready to step up from gentler derivatives to pure, high-performance ascorbic acid.
Best for all skin types skin looking to address dullness, hyperpigmentation, fine lines — with a focus on brightening + antioxidant.
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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 to clean, dry skin
- 2Follow with moisturizer
- 3Use morning (with SPF)
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
13% ascorbic acid stabilized with vitamin E and hyaluronic acid for effective results.
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), Tocopherol, Hyaluronic 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.