About COSRX Advanced The Vitamin C 23 Serum

If your skin feels dull, looks uneven, or is showing the first signs of aging, meet your new brightening hero. COSRX Advanced The Vitamin C 23 Serum is a high-strength yet gentle formula designed to restore your natural glow. With 23% pure vitamin C (ascorbic acid), this advanced serum works to fade dark spots, smooth rough texture, and protect against daily environmental stress.

But that's not all. This advanced the vitamin C serum combines powerful 23% vitamin C with super vitamin E and glutathione two trusted antioxidants that boost luminosity and defend your skin like a shield. To keep your skin happy and hydrated, the formula also includes panthenol, allantoin, and hyaluronic acid. These soothing ingredients lock in moisture and reduce irritation, making COSRX Advanced The Vitamin C 23 Serum suitable even for those new to higher-concentration vitamin C (though we always recommend a patch test first).

The texture? Smooth, lightweight, and fast-absorbing. It glides onto your skin without sticky residue, leaving it feeling plump, fresh, and visibly brighter from the very first use. With consistent use, you'll notice your complexion becoming more even, radiant, and youthful.

For best results, pair it with sunscreen during the day vitamin C boosts sun protection, but it's not a replacement for SPF.

🧴 How to Use

1. After cleansing and toning, dispense 2–3 drops of COSRX Advanced The Vitamin C 23 Serum.

2. Gently apply to your face, avoiding the eye area and any active wounds.

3. Pat lightly with fingertips for better absorption.

4. Follow with moisturizer and (during daytime) a broad-spectrum sunscreen.

💡 Tip: Store the serum in a cool, dark place away from direct sunlight to maintain its potency.

📝 Ingredients (Key Highlights)

Full love list: 23% Pure Vitamin C (Ascorbic Acid), Vitamin E, Glutathione, Panthenol, Allantoin, Sodium Hyaluronate (Hyaluronic Acid), and skin-friendly stabilizers.

Alcohol-free, paraben-free, and cruelty-free.

🌸 Best Season to Use

All seasons but especially autumn and winter or any time your skin looks dull from cold weather or indoor heating.

• 🍂 Fall / Winter: Fights the dullness caused by dry air and low sunlight. Layers beautifully under richer creams.

• 🌸 Spring: Prepares your skin for increased sun exposure (always with SPF).

• ☀️ Summer: Use at night to repair sun-induced pigmentation and brighten sun-kissed skin.

Avoid direct sunlight after application and always seal with SPF 30+ during the day.