Name: COSRX Vitamin C 23 Serum
Brand: COSRX
Price: 24.99 GBP
Availability: InStock

High-strength Vitamin C care for brighter, smoother and more even-looking skin

COSRX The Vitamin C 23 Serum is a concentrated Korean facial serum formulated with 23% pure Vitamin C (Ascorbic Acid) to target dullness, uneven-looking skin tone and visible signs of ageing.

Designed for customers looking for a more intensive Vitamin C treatment, the formula combines pure Vitamin C with Vitamin E and Hyaluronic Acid to provide antioxidant care while supporting hydration and a smoother, more radiant-looking complexion.

Key Benefits

• Formulated with 23% pure Vitamin C.

• Helps brighten dull-looking skin.

• Helps improve the appearance of dark spots and uneven skin tone.

• Helps reduce the appearance of post-blemish marks.

• Provides antioxidant skincare benefits.

• Helps improve the appearance of fine lines.

• Supports smoother-looking skin texture.

• Helps maintain skin hydration.

• Promotes a clearer, more radiant-looking complexion.

Key Ingredients

23% Pure Vitamin C

A high concentration of Ascorbic Acid, the pure form of Vitamin C, provides powerful antioxidant care while helping improve the appearance of dark spots, dullness and uneven-looking skin tone.

Vitamin E

An antioxidant that complements Vitamin C while helping protect the skin against environmental oxidative stress and supporting overall skin condition.

Hyaluronic Acid

Helps attract and retain moisture within the skin, supporting hydration and helping maintain a smoother, plumper appearance.

Allantoin

Helps soothe and condition the skin, supporting comfort alongside the serum's high concentration of Vitamin C.

Suitable For

• Dull-looking skin

• Uneven-looking skin tone

• Dark spot concerns

• Post-blemish marks

• Uneven skin texture

• Fine lines

• Skin lacking radiance

• Normal skin

• Combination skin

• Oily skin

• Experienced Vitamin C users

How to Use

After cleansing, shake the bottle gently from side to side before use.

Apply a few drops evenly over the face, avoiding the immediate eye and mouth areas.

Gently pat into the skin until absorbed, then follow with your preferred moisturiser.

If you are new to high-strength Vitamin C, introduce the serum gradually and increase frequency according to your skin's tolerance.

When used during the daytime, always finish your routine with broad-spectrum sunscreen.

Why Choose COSRX?

COSRX is a South Korean skincare brand recognised for ingredient-focused formulations designed to address specific skin concerns through straightforward skincare routines.

The Vitamin C 23 Serum is designed for those looking for a more concentrated approach to Vitamin C skincare. With 23% pure Ascorbic Acid, it provides targeted antioxidant and radiance-focused care for concerns such as dullness, dark spots, post-blemish marks and uneven-looking tone.

The addition of Vitamin E and Hyaluronic Acid complements the high-strength Vitamin C formula with antioxidant and moisture-supporting benefits, creating a concentrated treatment for brighter, smoother and healthier-looking skin.

Frequently Asked Questions

What does COSRX The Vitamin C 23 Serum do?

It helps improve the appearance of dullness, dark spots, uneven skin tone and post-blemish marks while providing antioxidant care and supporting smoother, more radiant-looking skin.

Does it really contain 23% Vitamin C?

Yes. The formula contains 23% pure Vitamin C in the form of Ascorbic Acid, making it a high-strength Vitamin C treatment.

Is it suitable for beginners?

Because it contains a high concentration of pure Vitamin C, beginners should introduce it gradually rather than immediately using it every day.

Can I use it every day?

Yes, depending on your skin's tolerance. If you are new to concentrated Vitamin C, begin with less frequent application and gradually increase use.

Is it suitable for sensitive skin?

The high concentration of pure Vitamin C may be too intensive for some sensitive skin types. Patch testing and gradual introduction are recommended, particularly if your skin is reactive.

Does it help with post-blemish marks?

Yes. Vitamin C can help improve the appearance of uneven pigmentation and post-blemish marks, contributing to a clearer and more even-looking complexion.

Can I use it in the morning?

Yes. If used in your morning routine, always follow with a broad-spectrum sunscreen.

How should I store the serum?

Pure Vitamin C is sensitive to factors such as heat, light and air. Keep the bottle tightly closed and follow the storage instructions provided on the product packaging. COSRX recommends refrigeration after opening to help maintain freshness.

Is a slight tingling sensation normal?

Because this is a concentrated 23% pure Vitamin C formula, some users may experience a mild temporary sensation during application. Discontinue use if significant or persistent irritation occurs.