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AHA 7 Whitehead Power Liquid

AcneExfoliant

AHA 7 Whitehead Power Liquid — Reddit Reviews

by COSRX

86nextscore45 verdicts

Updated October 10, 2026

Glycolic-acid AHA for whiteheads and texture; can sting and dry skin.

What the community says

Backed by 120 studies

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.

From Reddit

Backed by 29 threads from r/30PlusSkinCare, r/AsianBeauty and 3 more.

Read the threads ↓

What people love

Watch out for

  • Can burn fast if you overuse it
  • Drying enough to wreck a weak barrier
  • Sensitive or eczema-prone skin often backs off

Product details

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

    • All 5 studies that tested it on its own found it helped fade dark spots
    • On its own, it reduced facial darkening and made skin look lighter than a placebo
    • It also improved dark spots linked with sun damage in one clinical trial
  • 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

    • Most studies found niacinamide helped acne
    • It often cleared acne about as well as clindamycin when put on the skin
    • Some studies found it helped reduce red, sore spots and pimples
    • Some evidence is still uncertain because some studies found no clear difference
  • 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

    What the studies found
    • The most common side effects were stinging and burning, and some studies found more side effects than comparison treatments
  • 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

    What the studies found
    • The one study that tested it on its own found it helped the skin barrier
    • It lowered water loss through the skin
    • It increased the thickness of the outer skin layer

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

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