COSRX Vitamin C 23 vs Vichy Liftactiv Supreme 15% Vitamin C: Which Serum Is Better for Dark Spots, Glow & Fine Lines?
Two high-strength Vitamin C serums, but they suit different skin types and routines. COSRX The Vitamin C 23 Serum offers a more intensive 23% pure Vitamin C formula for experienced users, while Vichy Liftactiv Supreme 15% Pure Vitamin C Serum delivers a more balanced pharmacy-style approach to dullness, uneven tone, and early signs of aging.
This comparison will help you choose the better Vitamin C serum for dark spots, post-acne marks, dull skin, fine lines, uneven tone, and daily antioxidant skincare.
⚡ Quick Answer
Choose COSRX The Vitamin C 23 Serum if you already tolerate strong active ingredients and want a more intensive Vitamin C treatment for stubborn dullness, uneven-looking tone, and post-acne marks.
Choose Vichy Liftactiv Supreme 15% Pure Vitamin C Serum if you want a strong but more balanced pharmacy Vitamin C serum for daily glow, fine lines, and a smoother-looking complexion.
🏆 Quick Comparison Table
| Category | Winner | Why |
|---|---|---|
| Highest Vitamin C Strength | 🔥 COSRX Vitamin C 23 | 23% pure Vitamin C gives it the more intensive positioning |
| Best for Daily Use | ✨ Vichy Liftactiv 15% | Strong enough for visible results, but easier to fit into a regular routine |
| Best for Stubborn Dullness | 🏆 COSRX Vitamin C 23 | Better suited to experienced users seeking a more intensive brightening serum |
| Best for Fine Lines | ✨ Vichy Liftactiv 15% | More clearly positioned as a daily anti-aging pharmacy serum |
| Best for Experienced Users | 🔥 COSRX Vitamin C 23 | Higher concentration requires better tolerance and a careful introduction |
| Best Pharmacy Formula | 💛 Vichy Liftactiv 15% | More familiar choice for European pharmacy-skincare routines |
| Best Beginner Option | ✅ Vichy Liftactiv 15% | Still potent, but more approachable than a 23% pure Vitamin C serum |
🔥 COSRX The Vitamin C 23 Serum
COSRX The Vitamin C 23 Serum is the more intensive option in this comparison. Its high concentration of pure Vitamin C makes it especially appealing to experienced skincare users who want a stronger treatment for dullness, uneven-looking skin tone, and visible post-acne marks.
This is the serum I would choose when someone already knows that their skin tolerates pure ascorbic acid and wants a more concentrated K-beauty Vitamin C product.
✅ Best For
- Experienced Vitamin C users
- Stubborn dullness
- Uneven-looking skin tone
- Visible post-acne marks
- High-strength antioxidant routines
⚠️ Not Ideal If
- You are completely new to Vitamin C
- Your skin is very reactive
- Your barrier is irritated or compromised
- You already use several strong active ingredients
✨ Vichy Liftactiv Supreme 15% Pure Vitamin C Serum
Vichy Liftactiv Supreme 15% Pure Vitamin C Serum is the more balanced daily option. It still offers a high concentration of pure Vitamin C, but it fits more naturally into a pharmacy-style anti-aging routine focused on glow, fine lines, and a fresher-looking complexion.
This is the serum I would choose for someone who wants serious Vitamin C performance without immediately moving to the highest possible concentration.
✅ Best For
- Dull or tired-looking skin
- Early fine lines
- Uneven-looking tone
- Daily anti-aging routines
- Users who prefer French pharmacy skincare
⚠️ Not Ideal If
- Your skin cannot tolerate pure Vitamin C
- Your barrier is currently irritated
- You want the highest-strength option available
- You prefer very gentle Vitamin C derivatives
🔬 Main Difference
COSRX Vitamin C 23 is the stronger, more intensive treatment for experienced users.
Vichy Liftactiv Supreme 15% is the more balanced daily Vitamin C serum for glow, fine lines, and regular anti-aging care.
The real question is: do you want maximum Vitamin C strength, or a strong serum that may be easier to use consistently?
COSRX Vitamin C 23 Texture
A lightweight but treatment-focused serum. It feels more like a high-strength active step than a purely cosmetic glow serum, so a small amount is usually enough.
Vichy Liftactiv 15% Texture
Light and easy to spread, with a more familiar pharmacy-serum feel. It fits well into a morning routine before moisturizer and broad-spectrum sunscreen.
🧪 23% vs 15% Pure Vitamin C
23% pure Vitamin C sounds more powerful, but a higher percentage is not automatically the best choice for every skin type.
High concentrations may be useful for experienced users, but they may also be more difficult for sensitive or over-treated skin to tolerate.
15% pure Vitamin C still represents a high-strength formula and may offer the better balance between visible performance and regular use.
In practice, the serum you can apply consistently without irritation is usually more useful than the strongest serum you repeatedly stop using.
🌑 Which Is Better for Dark Spots and Post-Acne Marks?
If your skin already tolerates strong Vitamin C and you want the more intensive option for visible discoloration and post-acne marks, COSRX Vitamin C 23 has the advantage.
If you want gradual brightening alongside daily anti-aging care and fine-line support, Vichy Liftactiv Supreme 15% is the more balanced choice.
Neither serum replaces sunscreen. Daily broad-spectrum SPF remains essential when your goal is to prevent dark spots from becoming more visible.
👩⚕️ Pharmacist’s Perspective
These are both high-strength pure Vitamin C serums, so I would make the decision based mainly on skin tolerance and routine experience.
COSRX The Vitamin C 23 Serum makes more sense for someone who already uses active ingredients comfortably and wants a stronger brightening treatment.
Vichy Liftactiv Supreme 15% Pure Vitamin C Serum is the more practical recommendation for someone who wants strong daily antioxidant care with a clearer anti-aging focus.
If the skin is sensitive, irritated, or new to ascorbic acid, neither product should be introduced aggressively. Begin slowly, avoid combining several irritating actives at once, and monitor the skin for persistent stinging, redness, or peeling.
🏁 Final Verdict
Choose COSRX The Vitamin C 23 Serum if:
- You already tolerate high-strength Vitamin C
- You want the more concentrated option
- Your main concern is stubborn dullness
- You are targeting visible post-acne marks
- You prefer intensive K-beauty active serums
Choose Vichy Liftactiv Supreme 15% Vitamin C Serum if:
- You want strong but more balanced daily Vitamin C
- Your main concerns are glow and fine lines
- You prefer French pharmacy skincare
- You want a serum that fits easily into an anti-aging routine
- You are not ready for a 23% formula
🔥 Best for Maximum Strength & Stubborn Dullness: COSRX The Vitamin C 23 Serum
✨ Best for Daily Glow & Anti-Aging: Vichy Liftactiv Supreme 15% Vitamin C Serum
