COSRX · Serum
The Niacinamide 15 Serum
OY Korea #18 serumUS stock
15% niacinamide with zinc — the high-dose pore-and-spots play; work up to it if you're sensitive.
★ 4.42,900 reviews
BEvidence grade
$23Best 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 B
Grade B — Solid transparency and consistent ratings; limited third-party clinical data (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#18 serum
#18 serum · Olive Young Korea (seed) · Rank indicative — weekly verification pending
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Where to buybest total $23
| Retailer | Price | Ship + duty | Total | |
|---|---|---|---|---|
| Amazon ✓ official Official store — verify seller before launch Pays: Visa · MC · Amex · Discover · Amazon Pay · Affirm | $23 | — | $23BEST | Shop → |
| Olive Young Global ✓ official Ships from Korea 7–14d · +15% duty Pays: Cards · PayPal · Apple Pay · Alipay+ | $18 | $9.70 | $27.70 | 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.
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Cos De BAHA — Niacinamide 20% Serum$15 · saves $8 · shares Niacinamide, Zinc PCAAnua — Niacinamide 10% + TXA 4% Dark Spot Serum$22 · saves $1 · shares NiacinamideJumiso — Niacinamide 20 Serum$17 · saves $6 · shares NiacinamideOne Thing — Niacinamide 10%$18.96 · saves $4.039999999999999 · shares Niacinamide