
AHA 7 Whitehead Power Liquid — Reddit Reviews
by COSRX
Updated October 10, 2026
Glycolic-acid AHA for whiteheads and texture; can sting and dry skin.
What the community says
Redditors use this as a glycolic-acid exfoliant for whiteheads, texture, and occasional KP. Studies back the acne and smoothing angle, but the community keeps calling out stinging, dryness, and barrier damage if you overdo it.
What this means for you
What people love
- Whitehead slayer when you catch it early
- Helps rough texture, flaking, and KP
- Glycolic acid plus niacinamide in one bottle
Watch out for
Product details
Use caution
Skin Type
Product Traits
Key Ingredients
Where to buy
What the science says vs. what Reddit says
Anti-Aging
Strong evidence
Glycolic Acid: 17 studies tested it on its own. See all 22 studies
Both ingredients for anti-aging
Glycolic Acid Strong evidence
- Most studies found glycolic acid helped with signs of aging
- It often improved fine lines, roughness, and overall skin texture
- Some studies found it also helped discoloration and age spots look better
- It often worked about as well as other anti-aging treatments, though not always better
- The most common side effects were stinging, burning, and irritation
Niacinamide Some evidence
3 studies tested it on its own. See all 9 studies
Hyperpigmentation
Some evidence
Glycolic Acid: 16 studies tested it on its own. See all 25 studies
On Reddit: Bacne and dark spots clear up, though users warn it can sting like crazy. 3 mentions
Both ingredients for hyperpigmentation
Glycolic Acid Some evidence
- Most studies found glycolic acid helped fade dark spots or patches
- It often worked better when used with other treatments than those treatments alone
- Some studies found it improved melasma and post-acne dark marks while also improving skin texture
- The most common side effects were irritation, discomfort, and short-lived skin reactions, with rare lasting light spots
Niacinamide Some evidence
5 studies tested it on its own. See all 20 studies
Acne
Some evidence
Glycolic Acid: 13 studies tested it on its own. See all 22 studies
On Reddit: When red bumps start forming, spot-treat before a whitehead appears; many disappear by morning without popping. 20 mentions
Both ingredients for acne
Glycolic Acid Some evidence
- Most of these studies found it helped clear acne
- It often reduced blackheads and whiteheads, and some studies also found fewer red, sore spots
- It cleared acne more than a placebo in some studies
- It worked about as well as some other acne peels and creams in several studies
- The most common side effects were peeling and other early skin irritation
Niacinamide Some evidence
6 studies tested it on its own. See all 17 studies
Texture/Pores
Not proven yet
Few or mixed studies. This claim isn't established.
Glycolic Acid: 4 studies tested it on its own. See all 5 studies
On Reddit: Catch forming whiteheads early, and they’re often gone by the next day. 19 mentions
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 — 56 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 AHA Whitehead Power Liquid”
Positive
“Really good at getting rid of whiteheads and sebaceous filaments.”
Positive
“AHA every other PM”
Positive
“One of the better exfoliating products I've tried.”
Positive
“It helped smooth my skin without causing irritation, and my skin felt calmer rather than stripped afterward.”
Positive
“COSRX AHA 7 Whitehead Power Liquid is a HG product for me as well. It does such a great job at exfoliating and my skincare goes on so smoothly afterward.”
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





