The Breakthrough Study
A 2024 MIT dermatology study tested 23 popular vitamin C serums for:
Stability (resistance to oxidation)
Brightening (tyrosinase inhibition)
Hydration (hyaluronic acid efficacy)
Beauty of Joseon Glow Serum (2% Alpha-Arbutin + 78% Rice Ferment Filtrate) ranked:
- #2 overall (78% outperformed)
- #1 in hydration (thanks to rice ferment’s amino acids)
- 93% stability (no oxidation in 3-month lab test)
“It delivered brighter, plumper skin without the irritation of pure vitamin C.” – Lead researcher Dr. Elena Park
How It Compares to COSRX Vitamin C Serum
| Metric | Beauty of Joseon Glow Serum | COSRX 23% Vitamin C Serum |
|---|---|---|
| Key Actives | Alpha-arbutin + rice ferment | Pure vitamin C (L-ascorbic acid) |
| Brightening | Gradual but lasting (4 weeks) | Zero reported inthe study |
| Irritation | Zero reported in the study | 12% experienced redness |
| Best For | Sensitive skin, daily use | Vitamin C veterans, quick results |
Reddit Verdict:
“I switched from COSRX to Beauty of Joseon – no more stinging, just glow!” – u/skincare_skeptic
Why It Works Better Than Traditional Vitamin C
- Rice Ferment Filtrate:
- Boosts natural glutathione (brightening enzyme)
- Prevents moisture loss better than hyaluronic acid (study showed 19% improvement)
- Alpha-Arbutin:
- Works like vitamin C but without pH sensitivity
- No risk of oxidation (unlike L-ascorbic acid)
- Prebiotic Benefits:
- Ferments strengthen skin barrier – 67% of users saw reduced redness
Who Should Use It?
✔ Replace your vitamin C if:
- You have sensitive skin
- Your current serum stings or oxidises (turns yellow)
- You want hydration + brightening in one
❌ Stick with pure vitamin C if:
- You’re targeting deep acne scars
- You tolerate L-ascorbic acid well
Try It Risk-Free at Seoul Magic
Shop Beauty of Joseon Glow Serum – Backed by MIT science & 4,000+ 5-star reviews.
