
COSRX
COSRX The Vitamin C 23 Serum 20ml


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What if your glow didn’t take months to show up?
With 23% pure Vitamin C, this serum delivers fast-track radiance—without the fluff.
COSRX The Vitamin C 23 Serum is a concentrated brightening treatment powered by 23% pure ascorbic acid, designed for those who want visible, clinical-grade results—not just promises.
Formulated with Super Vitamin E (Tocotrienol)—a next-gen antioxidant 50x more powerful than standard Vitamin E—it helps protect against free radical damage, support collagen synthesis, and visibly improve elasticity and fine lines.
To balance the strength, Hyaluronic Acid and Allantoin hydrate and soothe, helping reduce sensitivity and keep skin feeling calm, not reactive. This makes it ideal for those looking to fade acne scars, boost glow, and improve skin texture without compromising comfort.
Housed in a dark, stable bottle to protect potency, this no-nonsense formula focuses on high-impact actives—perfect for brightening purists and glow-getters who mean business.
Key Benefits
• Brightens Fast: 23% Ascorbic Acid fades hyperpigmentation and evens tone
• Boosts Elasticity: Tocotrienol (Super Vitamin E) enhances firmness and collagen health
• Smooths Texture: Supports soft, radiant skin while minimizing fine lines
• Hydrates & Soothes: Hyaluronic Acid and Allantoin prevent dryness or irritation
• Minimal Formula, Maximum Results: No filler, just clinical-grade antioxidants
• Smart Packaging: UV-protective bottle keeps vitamin potency stable
Perfect For
• Acne scars, sunspots, or dull skin needing a radiance reset
• Users ready to level up to a high-strength Vitamin C
• Brightening-focused skincare routines
• Mature or prematurely aging skin
• Those who want fewer ingredients with greater efficacy
Ascorbic Acid (23%), Tocotrienol (Super Vitamin E), Hyaluronic Acid, Allantoin
- When to apply: Use at night or in the morning with SPF
How to apply: Apply 2–3 drops after toner, avoiding the eye area. Gently pat in
What to follow with: Follow with moisturizer and broad-spectrum sunscreen (if AM) - Pro tip: Store in a cool, dark place to extend vitamin potency and minimize oxidation
FAQ
If you’re new to high-strength Vitamin C, start slowly. The formula includes Allantoin to soothe, but sensitive skin should always patch test first.
Many users notice brighter skin and reduced dark spots within 2–4 weeks of consistent use.
Pure ascorbic acid is unstable, but the dark bottle protects it. Keep it cool and tightly sealed between uses.
Avoid layering strong actives in the same routine. Alternate them or use Vitamin C in the morning and others at night.
It’s lightweight and absorbs quickly with a smooth, serum-like finish—no tackiness.

Why everyone loves COSRX
Everyone loves COSRX because it captures the heart of Korean skin care—a beauty routine focused on hydration and a flawless complexion. Known for its gentle yet effective products, COSRX is a go-to for all skin types, from dry to oily and sensitive skin.
Their standout products, like the COSRX Advanced Snail 92 All In One Cream, are essential in the K-beauty world, addressing concerns like acne, pores, and anti-aging.
COSRX makes achieving the perfect Korean skin care routine easy and accessible, making it a beloved brand for skincare lovers.