COSRX Advanced The Vitamin C 23 Serum
Ingredients and claims, checked
Last checked September 21, 2026
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What is it like at a glance?
What the ingredients do
Moisture seal leads, with 7 of 30 ingredients.
Worth knowing
- On pore-clogging lists
Made for
What is this product?
- Key ingredients
- Ascorbic Acid 23%, 3-O-Ethyl Ascorbic Acid, Niacinamide
- When
- Morning and evening
A serum that adds targeted ingredients after toner. It contains 23% Ascorbic Acid.
What's good, and what to watch for?
Good points
- Contains Ascorbic Acid 23%
Watch-outs
- If you clog easily: Elaeis Guineensis (Palm) Oil, Helianthus Annuus (Sunflower) Seed Oil
What is in it?
The full ingredient list as the brand publishes it, in the printed order. Tap a name to read about that ingredient.
This brand publishes its ingredient list in Korean only. Names below are the matching INCI names from the Korean Cosmetic Association ingredient dictionary.
Key ingredientWorth a closer look
- Water
- Ascorbic Acid
- Butylene Glycol
- Dimethicone
- Panthenol
- 3-O-Ethyl Ascorbic Acid
- Squalane
- Sodium Hydroxide
- Caffeine
- Sodium Hyaluronate
- Sodium Metaphosphate
- Adenosine
- Acetyl Glucosamine
- Gardenia Florida Fruit Extract
- Allantoin
- Dextrin
- Tocotrienols
- Tocopherol
- Elaeis Guineensis (Palm) Oil
- Arginine
- Niacinamide
- Pentylene Glycol
- Glutathione
- Helianthus Annuus (Sunflower) Seed Oil
- Methyl Trimethicone
- Carthamus Tinctorius (Safflower) Seed Oil
- Camellia Japonica Seed Oil
- Daucus Carota Sativa (Carrot) Root Extract
- Glycyrrhiza Glabra (Licorice) Root Extract
- Beta-Carotene
Ingredients with no mark are ones we found nothing notable about, and when marks overlap on one ingredient we show the caution first.
Claims
See the claim, checked
Claims, checked
Low-irritation skincare for sensitive skin, 56 global beauty award wins
nothing specific to check
We quote each claim exactly as the brand published it, then check it against the ingredient list and the brand's own documents.