[COSRX] The Vitamin C 23 Serum

Product Overview

COSRX The Vitamin C 23 Serum is a high-potency brightening treatment formulated with 23% pure L-Ascorbic Acid (Vitamin C) to target dull skin, acne scars, and signs of aging. This antioxidant-rich serum combines Vitamin E and Glutathione to fight free radicals while Sodium Hyaluronate ensures deep hydration, making it suitable for all skin types including sensitive skin.

Key Benefits

• High-Potency Brightening: 23% pure Vitamin C effectively fades dark spots and hyperpigmentation
• Acne Scar Treatment: Visibly reduces the appearance of post-acne marks and discoloration
• Anti-Aging Power: Boosts collagen production to improve skin elasticity and reduce fine lines
• Antioxidant Protection: Vitamin E and Glutathione shield skin from environmental damage
• Deep Hydration: Sodium Hyaluronate locks in moisture for plump, healthy skin
• Even Skin Tone: Promotes a brighter, more radiant complexion over time

Best For

All skin types, especially:

• Dull, uneven skin tone needing brightening
• Acne-prone skin with scarring or PIH (post-inflammatory hyperpigmentation)
• Aging skin seeking firmness and elasticity improvement
• Those wanting potent Vitamin C without irritation (when introduced gradually)

How to Use

1. Start slowly: Use 2-3 times per week, then gradually increase frequency
2. Apply after cleansing and toning, on dry skin
3. Dispense 2-3 drops and gently pat onto face, avoiding eye area
4. Wait 1-2 minutes before applying next skincare step
5. Follow with moisturizer and SPF (essential during daytime use)
6. Use in PM routine if you have sensitive skin; AM or PM for normal skin
7. Store in a cool, dark place to maintain potency

Star Ingredients

L-Ascorbic Acid (23%): Pure Vitamin C that brightens, firms, and protects
Vitamin E (Tocopherol): Enhances Vitamin C efficacy and provides antioxidant benefits
Glutathione: Master antioxidant that brightens and detoxifies skin
Sodium Hyaluronate: Hydrates and plumps for smooth, supple skin

Texture & Finish

Lightweight, slightly viscous serum with a subtle citrus scent. Absorbs well without greasiness, though may feel slightly tacky initially. Leaves skin feeling nourished and prepped for subsequent products.

Pro Tips

• Patch test before first use, especially if new to high-strength Vitamin C
• Slight tingling upon application is normal; discontinue if irritation persists
• Always use SPF during the day when using Vitamin C products
• Pair with niacinamide (in separate routine) for enhanced brightening