COSRX The Vitamin C 23 Serum

What it is

The COSRX The Vitamin C 23 Serum is a high-strength brightening serum formulated with 23% pure Vitamin C (ascorbic acid) to visibly fade dark spots, improve hyperpigmentation, and boost overall radiance. Enriched with antioxidants and hydrating ingredients, it delivers powerful results for uneven and dull skin while helping to smooth fine lines.

Lightweight yet potent texture

Concentrated yet fast-absorbing formula that sinks into the skin without stickiness. Designed to deliver intensive Vitamin C benefits while keeping the skin hydrated and comfortable.

Key ingredients

• Vitamin C (Ascorbic Acid 23%) – Powerful antioxidant that brightens, evens skin tone, and fades pigmentation.

• Tocotrienol (Vitamin E) – Antioxidant that enhances the stability and effect of Vitamin C.

• Sodium Hyaluronate – Provides deep hydration and plumps the skin.

• Allantoin – Calms and soothes to reduce irritation.

• Arginine – Supports skin repair and elasticity.

Benefits

• Effectively fades pigmentation and dark spots

• Brightens dull and uneven skin tone

• Improves skin texture and radiance

• Provides antioxidant protection against free radical damage

• Suitable for experienced Vitamin C users

How to use

After cleansing and toning, apply 2–3 drops to the face in the morning. Follow with moisturizer and sunscreen. For sensitive skin, start with every other day and gradually build tolerance. Store in the refrigerator to slow down oxidation and preserve freshness.

Ingredients (INCI)

Ascorbic Acid (23%), Water, Butylene Glycol, 1,2-Hexanediol, Arginine, Sodium Hyaluronate, Allantoin, Tocotrienols, Hydroxyethylcellulose, and other stabilizing and hydrating agents.