FREQUENTLY ASKED QUESTIONS
How often can I use this highly concentrated vitamin C serum?
What should you avoid mixing with this serum?
How should you store and use the COSRX Vitamin C 23 Serum?

Fade Dark Spots & Boost Glow

Key Ingredients
High-Strength Pure Vitamin C Serum (23%) with Antioxidants for Brightening & Collagen Support
The COSRX The Vitamin C23 Serum is a potent, layered 23% pure ascorbic acid serum formulated in a dual-layer design (oil + water) to maintain stability and deliver deep brightening, evening of skin tone, wrinkle reduction, and a radiant glow. With complementary ingredients like Super vitamin E (tocotrienol), hyaluronic acid, allantoin, and glutathione, this K-beauty serum works to fade dark spots and support elasticity.
Ideal for experienced vitamin C users searching for a high concentration vitamin C booster serum for hyperpigmentation, dullness, or early aging concerns.
✨ Why You’ll Love It:
🚨 Important
• Keep Refrigerated (3-10°C) - store upright in refrigerator once opened to prevent oxidation.
• Recommend to use within 2 months of opening due to active ingredient protection.
Skin Types — Dull, Normal/Combination, Mature
Key Ingredients — Pure Vitamin C (Ascorbic acid), Super vitamin E (Tocotrienol), Hyaluronic Acid, Allantoin
Benefits — Brightens & evens skin tone, Fades dark spots, Boosts radiance, Provides antioxidant support, Adds hydration & glow
Formula Highlights — Fragrance-free, Parabens-free, Sulfates-free
One gift per tier. Auto-applied at cart while supplies last.
Tags: 25%off, Ampoules, Brightening, Cosrx, Dehydration, Dryness, Dullness, Essences & serums, Fine lines, Hyaluronic acid, K-beauty, Pores, Vitamin c, Wrinkles
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How often can I use this highly concentrated vitamin C serum?
Daily use is possible—but if you experience irritation, reduce frequency to every other day or every third day. Patch testing is strongly advised before full-face use.
What should you avoid mixing with this serum?
Avoid concurrent use of AHA/BHA exfoliants, benzoyl peroxide, and other strong actives during the same session to prevent overexfoliation or inactivation of L-ascorbic acid. It layers well with hydrating products like ceramides, hyaluronic acid, niacinamide, snail essence, or centella products.
How should you store and use the COSRX Vitamin C 23 Serum?
Store refrigerated (3–10 °C) in a cool, dark place. The serum comes in two layers—shake before use to blend oil and vitamin C. Use within 2 months of opening to avoid oxidation. Apply a few drops to clean skin, followed by moisturizer and SPF 30+ during the day.
Targets pigmentation, firms skin and restores youthful radiance
• 23% Pure Vitamin C (Ascorbic acid)
Improves blemishes and brighten skin, reduce wrinkles and enhance elasticity
• Super vitamin E (Tocotrienol)
50X higher antioxidant activities than tocopherol, stimulate collagen production
• Hyaluronic Acid
Strong moisture retention to maintain hydration
Feel free to contact us if you have any questions or concerns
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✦Unlock your skin's best with 1 simple intro✦
✦Unlock your skin's best with 1 simple intro✦
✦Unlock your skin's best with 1 simple intro✦
✦Unlock your skin's best with 1 simple intro✦
✦Unlock your skin's best with 1 simple intro✦
✦Unlock your skin's best with 1 simple intro✦