COSRX The Vitamin C 23 Serum – a high-concentration pure vitamin C serum for radiance
COSRX The Vitamin C 23 Serum is a facial serum with 23% pure vitamin C, formulated for dull, uneven-toned skin and visible post-breakout marks. The number in the name refers specifically to the concentration of ascorbic acid: this is not a cautious first step into vitamin C skincare, but a more intensive formula for those already familiar with this active ingredient. The concept is simple and clear – combining a high dose of pure vitamin C with antioxidants and comfort-supporting ingredients, so the serum is intended not only to boost radiance but also to promote a smoother-looking complexion.
23% vitamin C with antioxidant support
At the heart of the formula is pure ascorbic acid, complemented by the vitamin C derivative 3-O-ethyl ascorbic acid. This duo is accompanied by COSRX’s signature “Super Vitamin E” – tocotrienols from the tocopherol family – and glutathione. The key point of this product is not a long list of promises, but its decisive active-ingredient concentration, balanced with ingredients that support hydration and skin comfort.
- 23% pure vitamin C: helps brighten dull-looking skin, contributes to a more even-looking skin tone, and helps reduce the appearance of dark spots.
- Super Vitamin E and glutathione: this antioxidant combination complements the vitamin C concept and helps support the skin’s defenses against environmental oxidative stress.
- Comfort-supporting base: panthenol, allantoin, sodium hyaluronate, and squalane soften the feel of the intensive vitamin C formula and help reduce the sensation of dryness.
The softly yellow serum is lightweight, though not completely watery: its texture resembles a thin layer of serum and oil. It spreads smoothly and, once absorbed, leaves a soft, non-matte glow, making it a natural fit before moisturizing skincare. It will appeal most to experienced vitamin C serum users looking for a clearly concentrated formula – COSRX The Vitamin C 23 Serum stands out not through a decorative promise, but through its clearly defined focus on 23% pure vitamin C.
Usage
After cleansing your face in the morning or evening, apply a few drops of COSRX The Vitamin C 23 Serum to your fingertips and gently massage it onto your face, focusing on areas with dark spots or uneven skin tone. Allow the serum to absorb fully before applying moisturizer or sunscreen. Start with using the serum once every other day to gauge your skin’s tolerance, gradually increasing to daily use as your skin adjusts. Always perform a patch test before full application to avoid any potential irritation.
Ingredients
Water, Ascorbic Acid, Propanediol, Dimethicone, Tromethamine, Panthenol, 3-O-Ethyl Ascorbic Acid, Squalane, Caffeine, Sodium Chloride, Sodium Hyaluronate, Disodium EDTA, Sodium Sulfite, Glutathione, Adenosine, Gardenia Florida Fruit Extract, Dextrin, Acetyl Glucosamine, Allantoin, Tocotrienols, Tocopherol, Elaeis Guineensis (Palm) Oil, Niacinamide, Butylene Glycol, Arginine, Alcohol Denat., Pentylene Glycol, Glycyrrhiza Glabra (Licorice) Root Extract, Tocopherol, Carthamus Tinctorius (Safflower) Seed Oil, Helianthus Annuus (Sunflower) Seed Oil, Camellia Japonica Seed Oil, Methyl Trimethicone, Helianthus Annuus (Sunflower) Seed Oil, Daucus Carota Sativa (Carrot) Root Extract, Beta-Carotene, Tocopherol
The manufacturer is responsible for the product’s ingredients. Due to possible changes, we always recommend checking the ingredient list directly on the packaging.



In today's cosmetics market, where labels often resemble pages from a chemistry textbook, Cosrx Cosmetics stands out with its simple yet astonishingly effective approach. Their products contain only carefully selected active ingredients:
However, Cosrx Cosmetics cares not only for your skin but also for the planet. All their products are manufactured following the highest quality standards, without cruel animal testing. Additionally, the brand actively strives to reduce packaging waste and promotes sustainable production practices. Isn't it reassuring to know that your chosen cosmetics contribute to a cleaner planet? It's a double benefit—your skin glows, and the world becomes a little better.









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