COSRX · Serum
BHA Blackhead Power Liquid
OY Korea #9 serumUS stock
The gentle-BHA blueprint: 4% betaine salicylate that clears blackheads over weeks without the sting of pure salicylic. A patient product in an impatient category.
★ 4.55,600 reviews
AEvidence grade
$25Best 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⚠ 1 caution flag
✓ Fragrance-free✓ Fungal-acne safe✓ No drying alcohol✓ Essential-oil free⚠ Pregnancy-cautious free
Evidence checkGrade A · MFDS ✓
🇰🇷 MFDS-certified functional cosmetic — brightening (미백)Filed with Korea's FDA as 「코스알엑스바하블랙헤드파워리퀴드」 — a regulator-reviewed efficacy claim, not a marketing one.
Grade A — 4% betaine salicylate at disclosed dose; a decade of r/SkincareAddiction-era track record.
How grading works
Scored on clinicals · certifications · cross-platform rating consistency · transparency. Brands can't pay to change this.
What Korea says#9 serum
#9 serum · Olive Young Korea · 10-year global staple of the acids generation
"For blackheads, consistency with this is the answer."Translated from a Korean review · original: "블랙헤드는 이거 꾸준히 쓰는 게 답."
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Where to buybest total $25
| Retailer | Price | Ship + duty | Total | |
|---|---|---|---|---|
| Amazon ✓ official Official store — verify seller before launch Pays: Visa · MC · Amex · Discover · Amazon Pay · Affirm | $25 | — | $25BEST | Shop → |
| Olive Young Global ✓ official Ships from Korea 7–14d · +15% duty Pays: Cards · PayPal · Apple Pay · Alipay+ | $20 | $10.00 | $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.
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