Cosrx Advanced The Vitamin C 23 Serum

COSRX The Vitamin C 23 Serum is a high-strength vitamin C serum with 23% pure ascorbic acid designed to improve the appearance of dullness, uneven skin tone and visible signs of aging.

The intensive two-phase water-and-oil formula combines pure vitamin C with sodium hyaluronate, vitamin E, niacinamide and squalane. It helps support a brighter, fresher-looking complexion while maintaining hydration and skin comfort. The dual-phase texture should be gently shaken before use to ensure the formula is properly mixed.

Benefits

• Helps improve the appearance of uneven skin tone.
• Helps brighten dull-looking skin.
• Supports a fresher and more radiant complexion.
• Provides antioxidant care.
• Helps maintain skin hydration and comfort.

Who is it for

• Dull and uneven-looking skin.
• Skin with visible signs of aging.
• Skin in need of intensive brightening care.
• Skin accustomed to high-strength vitamin C products.

Main ingredients

• Ascorbic Acid 23% – pure vitamin C that helps improve the appearance of dullness and uneven skin tone.
• Sodium Hyaluronate – helps attract and retain moisture in the skin.
• Tocopherol & Tocotrienols – vitamin E antioxidants that help protect against oxidative stress.
• Niacinamide – helps support a more even-looking complexion and the skin barrier.
• Squalane – helps moisturize and maintain skin softness and comfort.

How to use

After closing the dropper securely, gently shake COSRX The Vitamin C 23 Serum 1–2 times to mix the two-phase formula. Apply a small amount evenly to the face, avoiding the eye area. Gently pat until absorbed. During the daytime, follow with sunscreen.

FAQ

How much vitamin C does COSRX The Vitamin C 23 Serum contain?
The serum contains 23% pure ascorbic acid.

Why should COSRX The Vitamin C 23 Serum be shaken before use?
The product has a two-phase water-and-oil formula, so gentle shaking helps mix the phases before application.

Can COSRX The Vitamin C 23 Serum be used during the day?
Yes. When used during the daytime, follow with sunscreen.

Warnings

• For external use only.
• Avoid contact with eyes.
• If the product gets into the eyes, rinse thoroughly with water.
• If irritation occurs, reduce the frequency of use or discontinue use.
• Use only on intact skin.
• A patch test is recommended before first use.
• Keep out of reach of children.