BHA Blackhead Power Liquid — Reddit Reviews
by COSRX
Updated October 5, 2026
Gentle 4% BHA for blackheads and clogged pores; stings some skin.
What the community says
Redditors use it as a mild leave-on exfoliant for blackheads, clogged pores, and rough texture. Studies found niacinamide can help acne, while community reports say this one is usually gentler than harsher BHAs. Overuse can sting, dry out, or set off redness.
What this means for you
What people love
- Gentler pore-cleaner than most BHAs
- Helps blackheads, clogged pores, and texture
- Niacinamide adds acne support
Watch out for
Product details
Use caution
Product Traits
Key Ingredients
What the science says vs. what Reddit says
Acne
Some evidence
Niacinamide: 6 studies tested it on its own. See all 17 studies
On Reddit: Nose blackheads and closed comedones are the focus, with users reporting tiny bumps disappearing by week four. 35 mentions
Hyperpigmentation
Some evidence
Niacinamide: 5 studies tested it on its own. See all 20 studies
Anti-Aging
Some evidence
Niacinamide: 3 studies tested it on its own. See all 9 studies
Skin Barrier
Not proven yet
Few or mixed studies. This claim isn't established.
Niacinamide: 1 study tested it on its own. See all 17 studies
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 169 mentions across 27 threads
COSRX BHA Blackhead Power Liquid on Reddit, in one place — 27 threads from r/tretinoin, r/AsianBeauty and 3 more, summarized.
“Would it be too much exfoliation if I also use Cosrx's BHA Power liquid in the morning”
Mentioned
“I saw that you're doing it too.”
Mentioned
“If anyone knows the answer, I would love to know!”
Mentioned
“CosRX BHA Blackhead Power Liquid”
Positive
“Really good at getting rid of whiteheads and sebaceous filaments.”
Positive
“BHA in the AM”
Positive
“the Cosrx purple toner (I think it's the blackhead one?)”
Positive
“Toner, I have the TirTir milky toner which is very hydrating, the Cosrx purple toner”
Positive
“I use em depending on the season and what my skin needs!”
Positive
“I used cosrx bha like 3 times a week”
Cautionary
“I took a break from everything in january because my skin started burning with products that never bothered me before”
Cautionary
“cosrx bha blackhead power liquid 3x a week - it broke me out and left my oily skin red and irritated instead of clearing pores”
Cautionary
“cosrx bha blackhead power liquid 3x a week - it broke me out and left my oily skin red and irritated instead of clearing pores”
Cautionary
“took me forever to dial it back”
Cautionary
“from piling on actives”
Cautionary
“or CosRx's power blackhead BHA serum.”
Mentioned
“my skin was angrier from that than ... CosRx's power blackhead BHA serum”
Mentioned
“sparing with the BHAs”
Mentioned
“If you can’t get Retin A, get Cosrx BHA blackhead power liquid.”
Positive
“Use it 2 or 3 times a week.”
Positive
“Cosrx Blackhead Power Liquid has helped with my nose pores.”
Positive
Dupes & Alternatives
Paula's Choice
Skin Perfecting 2% BHA Liquid Exfoliant
Better for Texture / Pores
11 shared traits
835 mentions
