Last updated: September 24, 2026
COSRX BHA Blackhead Power Liquid is a leave-on exfoliant designed to target blackheads, clogged pores, and rough texture. It usually costs around $20–26 for 100 ml. Instead of salicylic acid, it uses betaine salicylate, a gentler BHA derivative. This review explains how that ingredient works, how it compares with salicylic acid, and how to use it for clearer pores.
Quick answer: Our top pick in 2026 is the Blackheads — our #1 rated choice. See the full ranked comparison, alternatives and buying advice below.
What is inside
The key active is 4% betaine salicylate, a compound that combines salicylic acid with betaine (a naturally derived amino acid). It is often described as roughly equivalent to about 1% salicylic acid in effect, but with less irritation. The base is largely willow bark water, which also contains natural salicylates, plus niacinamide for additional oil control and tone benefits.
Betaine salicylate vs salicylic acid
Salicylic acid is the gold standard BHA with extensive research behind it. Betaine salicylate is gentler, making it a good option for people who find salicylic acid too drying. The trade-off is that it may work more slowly, and there is less independent research on its effects.
What it helps with
| Concern | Expected effect | Timeframe |
|---|---|---|
| Blackheads | Gradual reduction | 4–8 weeks |
| Clogged pores | Clearer, smaller-looking pores | 4–8 weeks |
| Rough texture | Smoother surface | 2–4 weeks |
| Oiliness | Slightly more balanced look | 4–6 weeks |
| Active acne | Supportive only | Not a treatment |
Who it suits
- Oily and combination skin with blackheads on the nose and chin.
- People who find salicylic acid too drying or irritating.
- Those new to BHAs who want a gentle start.
Who may want something stronger
If you have stubborn, deep congestion, a 2% salicylic acid liquid may deliver faster results. If blackheads persist after two to three months of consistent use, consider a retinoid or professional extraction.
How to use it
- After cleansing and drying the skin, apply with a cotton pad or press into skin with clean hands.
- Focus on congested areas such as the nose, chin, and forehead.
- Wait 15–20 minutes before the next step if you want maximum effect, or continue straight away for convenience.
- Follow with a hydrating serum and moisturizer.
- Start every other day, then increase to daily if tolerated.
- Wear broad-spectrum SPF 30+ in the morning.
Waiting time explained
COSRX suggests waiting after application so the liquid can work before other layers dilute it. In practice, many people skip the wait with little difference. If you have time, a short wait is a simple way to get more from each application.
Combining with other actives
It pairs well with niacinamide, hyaluronic acid, and gentle moisturizers. Use retinoids and strong AHAs on alternate nights. Vitamin C can be used in the morning while the BHA stays in the evening routine.
Texture and scent
It is a watery liquid with a faint, slightly sweet scent from the willow bark water. It absorbs quickly and leaves little residue. It rarely stings, which is one of its main advantages over stronger BHAs.
Value
At around 20–26 cents per ml, it is reasonably priced. A 100 ml bottle lasts around two to three months with daily use on a cotton pad, longer if applied with hands.
Setting realistic expectations
Blackheads are a mix of sebum and dead cells that oxidise at the pore opening. BHAs help loosen and clear them, but pores refill over time, so ongoing use is needed. Sebaceous filaments — the small grey dots on many people’s noses — are a normal part of skin and will always come back to some degree. BHAs can make them less noticeable but cannot remove them permanently.
BHA liquid vs pore strips and extraction tools
Pore strips and metal extractors give instant visual satisfaction, but they can stretch the skin, cause irritation, and leave pores looking the same within days. A leave-on BHA works more slowly but more evenly, loosening build-up so pores stay clearer over time. If you want occasional extractions, a trained professional can do them safely. For daily maintenance, a gentle BHA combined with consistent cleansing and a non-comedogenic moisturizer is a far kinder approach.
FAQ
Can I use it every day?
Many people can after a few weeks of every-other-day use. If you notice dryness or irritation, reduce frequency.
Is it good for sensitive skin?
It is gentler than salicylic acid, so many sensitive users tolerate it. Patch test first and start slowly.
Bottom line
COSRX BHA Blackhead Power Liquid is a gentle, effective leave-on BHA for blackheads, clogged pores, and texture. It suits people who find salicylic acid too harsh and offers good value. For very stubborn congestion, a stronger BHA or retinoid may deliver faster results, but for everyday pore care, it is a solid choice.
Ready to decide? Our #1 pick for 2026 is the Blackheads.
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