Korean PHA vs AHA: The Gentle Exfoliation Choice

AHA and PHA are both chemical exfoliants that dissolve dead skin for a smoother, brighter surface — but they suit different skin. AHAs (glycolic, lactic acid) are small molecules that penetrate quickly and exfoliate strongly, great for tone and texture but more likely to sting and increase sun sensitivity.

PHAs (gluconolactone, lactobionic acid) are larger molecules that work more on the surface — gentler, hydrating, and far better tolerated by sensitive skin. This guide compares them with real Korean examples of each.

We curated these from current Naver Shopping listings and kept the list to Korean brands. None of these listings exposed a public star rating, so the picks lean on the acid type and strength; whichever you choose, start slow and wear sunscreen daily.

How we picked

• Chose real Korean examples of both acid types to illustrate the choice: AHAs (stronger) and PHAs (gentler).
• Included a classic glycolic AHA and an AHA/BHA combo for those who tolerate stronger exfoliation.
• Included several PHA options — the gentle, sensitive-skin-friendly side — across budgets.
• Kept the list to Korean brands.
• Used review data only where a listing exposed it; in this Naver set none showed a public rating, so we relied on the acid type and strength.

AHA picks (stronger exfoliation)

1. 코스알엑스 AHA 7 화이트헤드 파워 리퀴드 (COSRX AHA 7 Whitehead Power Liquid) — Brand: 코스알엑스 (COSRX). Price: ₩19,720. The classic glycolic AHA — a 7% liquid that resurfaces for smoother texture and tone. Best if your skin tolerates stronger exfoliation and you want visible smoothing. Key spec: 7% glycolic AHA liquid, 100ml.

2. 오오티디 AHA BHA 클래리파잉 세럼 (OOTD AHA BHA Clarifying Serum) — Brand: 오오티디 (OOTD). Price: ₩15,000. An AHA-plus-BHA serum for surface and in-pore exfoliation — suited to oily, congested skin that can handle combined acids. Key spec: AHA/BHA clarifying serum, 50ml.

PHA picks (gentler exfoliation)

3. 빌리프 프라블럼 솔루션 비건 PHA 클리어링 토너 (Belif Problem Solution Vegan PHA Clearing Toner) — Brand: 빌리프 (Belif). Price: ₩17,000. A recognizable-brand PHA toner — gentle daily exfoliation that's hydrating rather than stripping. Best for sensitive skin or PHA beginners. Key spec: vegan PHA toner, 150ml.

4. 더마팩토리 글루코노락톤 PHA 10% 트리트먼트 (Derma Factory Gluconolactone PHA 10% Treatment) — Brand: 더마팩토리 (Derma Factory). Price: ₩6,300. A budget gluconolactone PHA treatment — the value way to try gentle PHA exfoliation. Key spec: 10% gluconolactone PHA, 150ml.

5. 닥터마이스킨 시카 어성초 브라이트닝 PHA 필링 토너 (Dr. My Skin Cica Heartleaf Brightening PHA Peeling Toner) — Brand: 닥터마이스킨 (Dr. My Skin). Price: ₩25,330. A PHA peeling toner buffered with cica and heartleaf — gentle exfoliation plus soothing for reactive skin. Key spec: cica PHA peeling toner, 200ml.

In-depth: which should you choose?

The honest answer is that PHA is the better default for most people who describe their skin as "sensitive," and AHA is the choice when you want stronger results and your skin can take it. PHAs like gluconolactone (the active in picks 4 and 5) are larger molecules, so they exfoliate more on the surface and penetrate less deeply than AHAs — which means much less stinging, less of the "purging" irritation, and they even attract moisture, so they hydrate as they exfoliate.

They also tend not to increase sun sensitivity as much as AHAs. That makes PHA ideal for sensitive, reactive, rosacea-prone, or barrier-compromised skin, and for exfoliation beginners. AHAs like the glycolic acid in pick 1 are smaller and penetrate faster, giving stronger smoothing, brightening, and tone correction — better for resilient skin, sun damage, and visible texture, at the cost of more irritation potential and a real need for daily sunscreen.

The practical rule: if acids have stung or irritated you before, or your skin is sensitive, start with PHA; if your skin is tough and you want maximum resurfacing, AHA delivers more. Either way, start two or three times a week, never stack with other strong actives the same night, and wear sunscreen every day — exfoliated skin burns faster, and that's true for both acids.

Comparison table

How to buy from outside Korea

These are Korean Naver Shopping listings and may not all ship internationally, so search both the Korean name and the English transliteration. 코스알엑스 (COSRX) and 빌리프 (Belif) are widely stocked on YesStyle, StyleKorean, Amazon, and iHerb, while smaller PHA brands are easiest through Korean-direct sellers.

Choose PHA for sensitive skin, AHA for stronger resurfacing, and always pair either with daily sunscreen.

FAQ

Q: What's the main difference between PHA and AHA?+

Molecule size. AHAs (glycolic, lactic) are small and penetrate fast for stronger exfoliation; PHAs (gluconolactone, lactobionic) are larger, work more on the surface, sting less, hydrate, and raise sun sensitivity less. PHA is gentler; AHA is stronger.

Q: Is PHA strong enough to actually do anything?+

Yes — PHA exfoliates, smooths, and brightens, just more gently and gradually than AHA. For sensitive skin or beginners, that gentleness is the advantage. If you want faster, more dramatic resurfacing and your skin tolerates it, AHA is stronger.

Q: Can I use AHA and PHA together?+

You generally don't need to, and combining strong exfoliants risks over-exfoliation. Pick one for your skin type. If you want both, use them on different days, and watch for irritation — sensitivity is a sign to cut back.

Q: Do I need sunscreen with PHA too?+

Yes — although PHA raises sun sensitivity less than AHA, you should still wear daily sunscreen with any exfoliating routine. Sun protection prevents the damage that exfoliation reveals and protects your results. With AHA it's especially critical, but it's a daily must either way.