COSRX Vitamin C 23 Serum

The Vitamin C 23 Serum is a highly concentrated skincare solution designed to enhance skin elasticity, reduce wrinkles, and improve overall skin tone. With 23% stabilized pure vitamin C, it offers an intensive treatment for dull, uneven, and rough skin. Its innovative two-layer composition ensures effective absorption and long-lasting hydration.

Product Name: The Vitamin C 23 Serum

Concentration: 23% stabilized pure vitamin C

Size: 20ml / 0.67fl. oz

Recommended Use: Morning and/or evening

Storage: Refrigerate at 3~10°C after opening

Shelf Life Post-Opening: 2 months

Contains 23% pure vitamin C for advanced skin benefits

Two-layer formulation with oil and serum for improved absorption

Stabilized to minimize oxidation

Lightweight, fast-absorbing texture

Suitable for all skin types, especially for experienced vitamin C users

Reduces hyperpigmentation and dark spots

Improves skin elasticity and reduces wrinkles

Boosts skin radiance and brightness

Minimizes pores and smoothens texture

Hydrates deeply with hyaluronic acid

After cleansing, lightly shake the bottle to mix the oil and serum layers.

Apply a few drops during the serum phase of your skincare routine.

Gently massage the serum into your skin, working from the center outward.

Follow with a moisturizer if needed to reduce any stickiness.

Use sunscreen with SPF 30 or higher if applying in the morning.

After 4 Weeks

Pigmentation: 16.26% reduction

Skin Tone: 32.89% reduction in redness

Elasticity: 16.36% improvement


After 1 Week

Brightness: 32.36% improvement

Pore Reduction: 38.65% reduction in volume

Based on clinical trials conducted on 20 subjects.

Orders are processed within 24 hours.

Standard delivery: 2-4 business days.

Packaging: Securely packed to prevent damage during transit.

Q: Can this serum be used in the morning?
A: Yes, but it must be paired with sunscreen (SPF 30 or higher) to protect against UV damage.

Q: How should I store the serum?
A: Store upright in the refrigerator (3~10°C) to maintain freshness and prevent oxidation.

Q: Is this product suitable for beginners?
A: It is recommended for those with prior experience using vitamin C products due to its high concentration.

Q: Can it be used with other skincare products?
A: Yes, but avoid mixing with strong actives like retinol or exfoliating acids in the same routine.