AHA 7 Whitehead Power Liquid — Reddit Reviews
by COSRX
Updated September 25, 2026
Glycolic-acid exfoliant for whiteheads and rough texture; can sting hard.
What the community says
A glycolic acid exfoliant with niacinamide, panthenol, and sodium hyaluronate that Redditors use for whiteheads, flaky texture, and stubborn bumps. Studies found glycolic acid can help acne, and community posts back that up, but people with sensitive or dehydrated skin report stinging, burning, and barrier damage.
What this means for you
What people love
- Whitehead killer when you catch it early
- Good on KP, flakes, and rough texture
- Niacinamide plus panthenol soften the edge
Watch out for
Product details
Use caution
Skin Type
Key Ingredients
Where to buy
What the science says vs. what Reddit says
Hyperpigmentation
Some evidence
Glycolic Acid: 15 studies tested it on its own. See all 26 studies
Both ingredients for hyperpigmentation
Glycolic Acid Some evidence
- Most studies found glycolic acid helped fade dark patches
- It often worked better when used with other treatments than those treatments alone
- On its own, it also faded dark patches in some studies
- It often worked about as well as some other peels or retinol, but not better than all options
- The most common side effects were redness, irritation, and peeling
Niacinamide Some evidence
5 studies tested it on its own. See all 24 studies
- All of these studies found niacinamide helped fade dark spots or patches
- In clinical trials, 5% niacinamide faded dark spots more than a placebo
- It also helped when used with salicylic acid peels, more than peels alone
- Used on its own, it helped, but one study found a niacinamide mix worked better
- One study found the fading effect reversed after stopping niacinamide
Acne
Some evidence
Glycolic Acid: 13 studies tested it on its own. See all 22 studies
On Reddit: Glycolic acid treats red bumps before whiteheads form, clearing pimples overnight with spot application. 18 mentions
Both ingredients for acne
Glycolic Acid Some evidence
- Most studies found glycolic acid helped acne
- It often reduced pimples, blackheads, whiteheads, and sometimes skin redness
- Some studies found it cleared acne better than a placebo
- It often worked about as well as other acne treatments or peels
- The most common side effects were early irritation and peeling
Niacinamide Some evidence
6 studies tested it on its own. See all 17 studies
- Most studies found niacinamide helped acne
- Some studies found 4% niacinamide cleared acne about as well as clindamycin
- One study found 4% niacinamide improved red, sore spots, but IPL worked better
- Some research found no clear difference, and a large review said the effects were uncertain
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 53 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
“AHA every other PM”
Positive
“I don't want to change.”
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
5 shared traits
813 mentions
