B
By Wishtrend · Serum
Vitamin C 21.5% Advanced Serum
OY Korea #40 serumUS stock
21.5% pure ascorbic in a famously stable base — the serious-but-fair-priced vitamin C of the acids era.
★ 4.44,400 reviews
AEvidence grade
$27Best total · duties in
lightTexture · Serum
Is this right for your skin? — take the 60-second quiz and this box becomes a personal verdict.
Ingredient check✓ all clear
✓ Fragrance-free✓ Fungal-acne safe✓ No drying alcohol✓ Essential-oil free✓ Pregnancy-cautious free
Evidence checkGrade A
Grade A — Disclosed formula and multi-year consistent cross-platform ratings (seed draft — verify before launch).
How grading works
Scored on clinicals · certifications · cross-platform rating consistency · transparency. Brands can't pay to change this.
What Korea says#40 serum
#40 serum · Olive Young Korea (seed) · Rank indicative — weekly verification pending
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Where to buybest total $27
| Retailer | Price | Ship + duty | Total | |
|---|---|---|---|---|
| Amazon ✓ official Official store — verify seller before launch Pays: Visa · MC · Amex · Discover · Amazon Pay · Affirm | $27 | — | $27BEST | Shop → |
| Olive Young Global ✓ official Ships from Korea 7–14d · +15% duty Pays: Cards · PayPal · Apple Pay · Alipay+ | $22 | $10.30 | $32.30 | Shop → |
Totals include estimated import duty on Korea-shipped orders (15%, post–de minimis). Links open retailer search; production uses exact product affiliate links. Payment methods indicative — verify at checkout.