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 & wrinkles — with a focus on brightening + antioxidant.
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How to Use
- 1Apply to clean, dry skin
- 2Follow with moisturizer
- 3Use morning (with SPF)
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
13% ascorbic acid stabilized with vitamin E and hyaluronic acid for effective results.
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.