AHA 7 Whitehead Power Liquid — Reddit Reviews
by COSRX
Updated September 8, 2026
Glycolic acid exfoliator clears whiteheads fast and improves texture; can sting sensitive skin.
What the community says
A 7% glycolic acid liquid exfoliant praised for clearing whiteheads and smoothing skin texture. Redditors with KP and acne see results but warn of stinging and barrier damage on sensitive or dry skin. Studies found it improves acne and texture but may cause irritation.
What this means for you
What people love
- Clears whiteheads and pimples rapidly, often overnight
- Improves skin texture and helps reduce keratosis pilaris bumps
- Offers an effective glycolic acid alternative with no strong smell
Watch out for
- Can damage skin barrier and cause stinging, especially if overused or on sensitive skin
- Not suitable for eczema-prone or very sensitive skin due to irritation risk
- Requires careful sunscreen use as AHA increases sun sensitivity
Product details
Use caution
Skin Type
Key Ingredients
Where to buy
What the science says vs. what Reddit says
What the science says
Glycolic Acid
Strong evidence for acne- It usually improved acne, and some studies found it cleared acne better than a placebo
- 22 studies back this, including several large reviews
- It often worked about as well as other acne treatments, though some peels worked better
- Some studies found stronger results when glycolic acid was used with other ingredients
- The most common side effects were peeling and mild skin irritation, though some studies reported few side effects
Niacinamide
Some evidence for acne- It often improved acne, but many studies used niacinamide together with other ingredients
- 19 studies back this, including one large review
- Some studies found it worked about as well as clindamycin or benzoyl peroxide
- A few studies found niacinamide beat a placebo or no treatment for red, sore spots and blemishes
- No major side effects were reported in the findings given
What Reddit says
The why
Glycolic acid powers this liquid to clear whiteheads overnight, especially when applied at red bump stage.
“CosRx aha power white head (swear it makes pimples disappear over night”
17 mentions for acne
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 50 mentions across 29 threads
COSRX AHA 7 Whitehead Power Liquid on Reddit, in one place — 29 threads from r/30PlusSkinCare, r/AsianBeauty and 3 more, summarized.
“CosRX AHA 7. It is the OG of glycolic acids”
Positive
“and doesn’t have that weird smell that the Ordinary toner has”
Positive
“Anyone know (affordable) swaps for the ordinary? Specifically the glycolic acid?”
Positive
“CosRX BHA Blackhead Power Liquid and CosRX AHA Whitehead Power Liquid - Really good at getting rid of whiteheads and sebaceous filaments.”
Positive
“I just got so used to applying these separately (BHA in the AM, AHA every other PM)”
Positive
“Really good at getting rid of whiteheads and sebaceous filaments.”
Positive
“CosRx AHA 7 Whitehead Power Liquid”
Mentioned
“Right now I have Cosrx AHA/BHA Clarifying Treatment Toner, Cosrx BHA Blackhead Power Liquid, Cosrx AHA 7 Whitehead Power Liquid, and OST C20.”
Mentioned
“The AHA is photosensitizing - And it is a low percentage of glycolic, but it's still glycolic, which some people dislike no matter what.”
Mentioned
“Cosrx AHA Whitehead Power Liquid”
Cautionary
“I [burned with glycolic acid] (hooray - this was before I knew to dilute the AHA Whitehead Power Liquid).”
Cautionary
“It seems to be helping get rid of any flakes I get, especially on my nose/nostrils and eye sockets”
Cautionary
“Cosrx AHA Whitehead Power liquid”
Positive
“I find a combination of AHA and lots of hydration makes a massive difference.”
Positive
“Rn it's:”
Positive
“Cosrx AHA 7 Whitehead power lotion - A little too strong for my skin and i was too liberal with usage.”
Cautionary
“Ruined my skin barrier because of that so it was demoted to body use.”
Cautionary
“it worked WONDERSS on my bacne and dark spots. Cleared it all up, although it still stung like crazy.”
Cautionary
Dupes & Alternatives
Paula's Choice
Skin Perfecting 2% BHA Liquid Exfoliant
Better for Texture / Pores
4 shared traits
757 mentions
