The COSRX Advanced The Vitamin C23 Serum is a highly concentrated vitamin C serum with ascorbic acid and squalane that brightens your complexion and restores its vitality. The lightweight, fast-absorbing texture glides effortlessly into the skin and leaves no sticky residue.

At the heart of the formula is pure, highly concentrated ascorbic acid, which—together with 3-O-ethyl ascorbic acid—helps your skin appear more radiant and even-toned overall. Squalane and sunflower seed oil hydrate the skin, while hyaluronic acid further helps the skin retain moisture. Niacinamide rounds out the effects and helps create a more even complexion. Caffeine and adenosine complement the formula and contribute to an overall more vibrant appearance, while licorice root extract and carrot root extract further support the skin’s appearance. Finally, camellia oil and safflower oil leave the skin feeling more supple.

This serum is suitable for all skin types seeking a more radiant, even complexion—the high-dose vitamin C formula is particularly effective for skin that looks tired or uneven. Thanks to its light, fast-absorbing texture, it’s also well-suited for combination skin.

Active Ingredients
Vitamin C (ascorbic acid 23%): brightens the complexion, promotes an even skin tone, and enhances radiance
Niacinamide: evens out skin tone, supports skin clarity, and promotes an even complexion
Hyaluronic acid: moisturizes and leaves the skin feeling plump
Allantoin: soothes the skin and helps maintain a balanced skin feel
Vitamin E (tocopherol & tocotrienols): supports skin care, promotes a supple complexion
Glutathione: enhances radiance, makes the complexion appear fresher

Suitable for skin type:

• All skin types

Aqua/Water, Ascorbic Acid(23%), 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

After cleansing and applying toner, apply 2–3 drops to your entire face and gently pat the serum in to improve absorption. Follow with a moisturizer and, during the day, add sunscreen. Do not combine this serum with retinol or acid-based products in the same skincare routine.