A low pH cleanser is a face wash made to sit closer to your skin’s naturally acidic surface than a traditional alkaline soap. Pick by skin type: a light gel for combination skin, a cushiony foam or gel for dry skin, and a short, fragrance-free formula for sensitive skin.
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Quick answer: A low pH cleanser is one whose listing states a pH close to skin’s acidic surface, usually around 5.0 to 6.0, rather than an alkaline soap. For combination skin, COSRX Low pH Good Morning Gel Cleanser and Round Lab 1025 Dokdo both list 5.0 to 6.0. For dry skin, Torriden Balanceful Cleansing Gel lists about 5.5, and for sensitive skin, ETUDE SoonJung 5.5 Foam Cleanser lists 5.5 with the shortest ingredient list here.
Quick pick: Round Lab 1025 Dokdo Cleanser, 150 ml. Its listing gives a pH of 5.0 to 6.0. Check price and stock at Mirai
How we chose: we read each product’s Mirai listing and its ingredient list on INCIDecoder. We only give a pH number when the listing states one. We did not measure pH or run a wear trial. Prices are Mirai’s at our last check and can change.
What “low pH” means, and why the acid mantle matters
pH runs from 0 to 14, and 7 is neutral. Skin’s surface is acidic. In a study of 330 people, researchers estimated that natural skin surface pH averages about 4.7. Skin with a pH below 5.0 also scored better on barrier function, moisture and scaling than skin above 5.0. The same paper notes that prior use of soap affects skin pH, and that even tap water at around pH 8 can raise it for up to six hours.
Cleansers fall into two broad groups. Soaps are alkaline. Synthetic detergents, called syndets, can be made at a lower pH. A 2022 review of soaps and syndets says soaps tend to cause barrier disruption, lipid loss and pH change, while syndets can better maintain skin’s structure. A dermatology review of cleansers also links syndets to less irritation and dryness than alkaline soaps.
pH isn’t the only thing that matters. The 2022 review puts the type of surfactant at the center of how mild a cleanser is. Still, a lower pH is a sensible starting point.
How to tell if a cleanser is low pH
- Look for a stated number. Some listings give a pH or a range, such as 5.5 or 5.0 to 6.0. Those are the brand’s claims, not lab results from us.
- Read the surfactants. The picks below lead with synthetic surfactants such as sodium cocoyl isethionate, betaines and glucosides. Surfactants alone won’t tell you the pH, so use them alongside a stated number.
- Don’t trust “gentle” alone. One Anua foam is a good example. The Anua Heartleaf Quercetinol Pore Deep Cleansing Foam listing says it is made at a higher, alkaline pH, like many traditional foaming cleansers. If low pH is your goal, it isn’t the pick, however mild the marketing sounds.
Low pH cleanser comparison
| Product | pH stated on the listing | Texture | Fragrance or essential oils on INCIDecoder | Best for | Size / price at Mirai |
|---|---|---|---|---|---|
| Round Lab 1025 Dokdo Cleanser | 5.0 to 6.0 | Foam | Chamomile flower oil | Combination | 150 ml / $19.62 |
| COSRX Low pH Good Morning Gel Cleanser | 5.0 to 6.0 | Gel | Tea tree leaf oil | Combination | 150 ml / $32.68 |
| Torriden Balanceful Cleansing Gel | About 5.5 | Clear gel | Rosemary leaf oil | Dry, combination | 200 ml / $24.38 |
| Isntree Hyaluronic Acid Low-pH Cleansing Foam | About 5.5 | Dense foam | None listed | Dry | 150 ml / $35.68 |
| AESTURA Atobarrier 365 Gentle Foaming Cleanser | ”Low-pH”, no number given | Fine foam | None listed | Sensitive, dry | 150 ml / $30.00 |
| ETUDE SoonJung 5.5 Foam Cleanser | 5.5 | Foam | None listed (Mirai’s list) | Sensitive | 150 ml / $29.78 |
Prices are Mirai’s at our last check.
For combination skin: Round Lab 1025 Dokdo vs COSRX Good Morning Gel
Round Lab 1025 Dokdo Cleanser
What the listing says. A low pH cleanser with a pH of 5.0 to 6.0, with minerals from the deep sea water of Ulleungdo Island.
What’s in it. The ingredient list leads with sodium cocoyl isethionate, a synthetic surfactant, then glycerin and more mild surfactants. Panthenol, ceramide NP and hyaluronic acid sit lower down. Chamomile flower oil appears near the end.
Who it suits. Combination skin that wants a foam at the lowest price here.
Check Round Lab 1025 Dokdo Cleanser at Mirai
COSRX Low pH Good Morning Gel Cleanser
What the listing says. A slightly acidic gel with a pH of 5.0 to 6.0.
What’s in it. The ingredient list uses cocamidopropyl betaine and sodium lauroyl methyl isethionate as its cleansers. It also has betaine salicylate and tea tree leaf oil.
Who it suits. Combination or oilier skin that prefers a gel to a foam. Skip it if tea tree bothers you. For more on this brand, see our COSRX guide.
Check COSRX Low pH Good Morning Gel Cleanser at Mirai
Dokdo or COSRX. Pick Dokdo for a foam and the lower price. Pick COSRX for a gel texture.
For dry skin: Torriden Balanceful vs Isntree Hyaluronic Acid foam
Torriden Balanceful Cleansing Gel
What the listing says. A clear gel with minimal lather, made at about pH 5.5 for daily use or as a second cleanse.
What’s in it. The ingredient list puts glycerin second, then mild surfactants such as sodium cocoyl alaninate and lauryl glucoside. It also has centella extracts, panthenol and ceramide NP. Rosemary leaf oil is near the end.
Who it suits. Dry or combination skin that likes a low-foam gel. It is also the largest bottle here.
Check Torriden Balanceful Cleansing Gel at Mirai
Isntree Hyaluronic Acid Low-pH Cleansing Foam
What the listing says. A dense foam at about pH 5.5, with hyaluronic acid and glycerin.
What’s in it. The ingredient list leads with sodium cocoyl isethionate and glycerin, followed by eight forms of hyaluronic acid, panthenol and ceramide NP. No fragrance is listed.
Who it suits. Dry skin that wants a richer foam without fragrance.
Check Isntree Hyaluronic Acid Low-pH Cleansing Foam at Mirai
Another option. The Round Lab Soybean Panthenol Cleanser ($33.50) is a creamy foam that its listing pitches at dry skin. The listing doesn’t state a pH, so we haven’t ranked it here.
For sensitive skin: AESTURA Atobarrier 365 vs ETUDE SoonJung 5.5
AESTURA Atobarrier 365 Gentle Foaming Cleanser
What the listing says. A low pH, mild foaming cleanser for dry, sensitive skin. It doesn’t give a number.
What’s in it. The ingredient list uses glucoside and amphoteric surfactants, with glycerin, sorbitol and panthenol. Near the end are ceramide NP, cholesterol and sphingolipids, which are skin-barrier lipids. No fragrance is listed.
Who it suits. Sensitive or dry skin that wants a soft foam with barrier lipids.
Check AESTURA Atobarrier 365 Gentle Foaming Cleanser at Mirai
ETUDE SoonJung 5.5 Foam Cleanser
What the listing says. A pH 5.5 foam, free from fragrance and alcohol.
What’s in it. The list on the listing has 13 ingredients. Glycerin is followed by mild surfactants (lauryl hydroxysultaine, coco-glucoside, sodium cocoyl isethionate), then panthenol and madecassoside.
Who it suits. Sensitive skin that wants the shortest list here. Patch-test any new cleanser.
Check ETUDE SoonJung 5.5 Foam Cleanser at Mirai
Foam or gel: which texture to choose
Texture and pH are separate choices. A foam can be low pH, as Isntree and ETUDE show, and a “gentle” foam can still be alkaline, as the Anua Quercetinol listing shows. The listings describe Torriden’s gel as having minimal lather and COSRX’s as a moderate, soft lather, while Isntree’s foam has a dense lather. None of the low pH picks here is a soap.
For oily skin, any of the combination picks will work. Our oily skin routine covers the rest of the routine.
Browse all water-based cleansers at Mirai
Where a low pH cleanser fits in your routine
A low pH cleanser is usually the second step of a double cleanse, after an oil or balm on days you wear sunscreen or makeup. Our double cleansing guide explains when you need both steps, and our best Korean cleansing oils cover the first step. For a broader roundup of oils, foams and balms, see best Korean cleansers by skin type.
The American Academy of Dermatology suggests washing twice a day and after sweating, using lukewarm water and your fingertips, and patting dry with a soft towel.
After cleansing, a toner such as Anua Heartleaf 77 Hyaluron Soothing Toner is the next step. Our Korean toner rankings compare more options.
Frequently asked questions
What is a low pH cleanser?
A face wash made to be mildly acidic, closer to skin’s natural surface pH (a study of 330 people estimated an average of about 4.7) than traditional alkaline soaps.
Is a low pH cleanser better for your skin?
Research links soap-based, alkaline cleansers with more barrier disruption and pH change than milder synthetic cleansers, so a low pH formula is a sensible default, especially for dry or sensitive skin.
Which Korean cleanser suits combination skin?
A light foam or gel with a stated low pH, such as Round Lab 1025 Dokdo Cleanser or COSRX Low pH Good Morning Gel Cleanser, both listed at pH 5.0 to 6.0.
What is a good Korean low pH cleanser for dry skin?
Torriden Balanceful Cleansing Gel or Isntree Hyaluronic Acid Low-pH Cleansing Foam, both listed at about pH 5.5 and both with glycerin high in their ingredient lists.
Is foam cleanser bad for sensitive skin?
Not necessarily: low pH, fragrance-free foams such as ETUDE SoonJung 5.5 and AESTURA Atobarrier 365 are made to be mild, but check the listing, since some foams are alkaline.
How can I tell a cleanser’s pH?
Look for a pH stated on the listing or the brand’s page; the ingredient list alone can’t tell you the number.
Sources
- Lambers H, et al. Natural skin surface pH is on average below 5, which is beneficial for its resident flora. Int J Cosmet Sci. 2006;28(5):359-70: https://pubmed.ncbi.nlm.nih.gov/18489300/
- Mijaljica D, Spada F, Harrison IP. Skin Cleansing without or with Compromise: Soaps and Syndets. Molecules. 2022;27(6):2010: https://pubmed.ncbi.nlm.nih.gov/35335373/
- Draelos ZD. The science behind skin care: Cleansers. J Cosmet Dermatol. 2018;17(1):8-14: https://pubmed.ncbi.nlm.nih.gov/29231284/
- American Academy of Dermatology, Face washing 101: https://www.aad.org/public/everyday-care/skin-care-basics/care/face-washing-101
- INCIDecoder ingredient lists, linked in each product section. Product pH, texture and fragrance claims come from each Mirai listing.
