Medicube
Zero Foam Cleanser$14.11Low pH Good Morning Gel Cleanser
The two mild surfactants, cocamidopropyl betaine and sodium lauroyl methyl isethionate, are ingredients two and three, ahead of a botanical ferment cast built to leave a low-pH finish rather than an alkaline strip.
No reviews yet$13.99
150ml
$9.33 per 100 ml
- Korean-market formula
- Ships from California or direct from Korea
- Korean barcode and batch code intact
- Suited to
- Blemish-proneDryDehydratedOily
- Helps with
- Breakouts and congestionDehydrationExcess oilVisible redness and reactivity
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Medicube Zero Foam CleanserMedicube
$14.11
$15.29
$42.50
- 30-day returns
- Free US shipping on orders of $100 or more
- Tracked delivery to your door
How it works
A morning wash has far less to remove than an evening one: no sunscreen, no makeup, only what the night left behind. This is the gel built for that job, and the low pH in its name is why it belongs on the morning side of the routine. It lathers thinly in wet hands, rinses in seconds, and leaves the face ready for toner rather than tight. In the evening it works as the second cleanse, after an oil or a balm has taken the sunscreen off. Skin that feels stripped by a foaming wash usually gets on better with a gel like this one.
How to use
- Use the Low pH Good Morning Gel Cleanser as your first step in the morning, on a face wet with lukewarm water.
- A short pump into wet hands, worked to a thin lather before it touches the face, then massaged for twenty seconds.
- Rinse and go straight to toner while skin is still damp. In the evening it goes after an oil cleanse rather than before it.
- Once or twice a day. Do not use it as the only evening cleanse on a day you wore sunscreen; a water-based gel is not built to lift it on its own.
COSRX Low pH Good Morning Gel Cleanser
What kind of surfactants does this gel cleanser use?
Cocamidopropyl betaine and sodium lauroyl methyl isethionate lead the list, both mild surfactants used across low-pH Korean cleansers rather than harsher sulfates. That combination is chosen specifically to clean without pushing the skin's surface pH far from its natural range, which is the point of a low-pH gel cleanser.
Does this cleanser contain fermented ingredients?
Yes, saccharomyces ferment appears on the list. Fermented filtrates like this are a common Korean formulation choice, generally included for their soothing and conditioning reputation on the skin's surface during a wash.
Is a gel cleanser like this suitable for morning use only, or twice a day?
A mild surfactant base built around cocamidopropyl betaine and sodium lauroyl methyl isethionate is gentle enough for twice-daily use for most skin types. Very dry or barrier-compromised skin sometimes does better limiting a foaming or gel cleanser to once a day and using water alone or a cream cleanser for the other cleanse.
Why is this called a 'Good Morning' cleanser specifically?
The naming reflects its intended use as a light, low-pH morning wash rather than a heavy evening cleanser meant to remove makeup or sunscreen. The mild surfactant base here is built for a quick refresh rather than for breaking down a full day of product.
Not on the ingredient list below: fragrance or parfum, denatured or SD alcohol, silicones, parabens, sulfate surfactants, mineral oil or petrolatum and added color.
Full INCI (25): Water, Cocamidopropyl Betaine, Sodium Lauroyl Methyl Isethionate, Sodium Chloride, Polysorbate 20, Styrax Japonicus Branch/Fruit/Leaf Extract, Butylene Glycol, Saccharomyces Ferment, Cryptomeria Japonica Leaf Extract, Nelumbo Nucifera Leaf Extract, Pinus Palustris Leaf Extract, Ulmus Davidiana Root Extract, Oenothera Biennis (Evening Primrose) Flower Extract, Pueraria Lobata Root Extract, Melaleuca Alternifolia (Tea Tree) Leaf Oil, Allantoin, Caprylyl Glycol, Ethylhexylglycerin, Betaine Salicylate, Citric Acid, Ethyl Hexanediol, 1,2-Hexanediol, Trisodium Ethylenediamine Disuccinate, Sodium Benzoate, Disodium EDTA
Ingredient list read from inkeedecoder.com on 10 September 2026.
25 of 25 explained
- Water solvent
- Water is the base almost every serum, toner and cream is built on. It dissolves the water-loving ingredients and sets how light the finished texture feels. On an INCI list it is usually first, which only means it is the largest single ingredient by weight.
- Cocamidopropyl Betaine surfactant
- Cocamidopropyl Betaine is a coconut-derived secondary surfactant. Its job is to boost foam and soften the harshness of the main cleanser rather than to clean on its own.
- Sodium Lauroyl Methyl Isethionate surfactant
- Sodium Lauroyl Methyl Isethionate is a mild cleanser that makes a dense, creamy foam. It is one of the gentlest surfactants that still lathers properly.
- Sodium Chloride thickener
- Sodium Chloride is salt. In a cleanser it thickens the liquid; in a mask or essence it balances the mineral content of the water phase. It has no active role.
- Polysorbate 20 emulsifier
- Polysorbate 20 is a solubiliser: it dissolves small amounts of oil or fragrance into a watery formula so nothing separates or floats.
- Styrax Japonicus Branch/Fruit/Leaf Extract plant extract
- Japanese snowbell extract, taken from branch, fruit and leaf together. It is used as a conditioning plant extract.
- Butylene Glycol humectant
- Butylene Glycol is a small glycol that does two jobs at once: it holds water in the top layer of skin and it dissolves plant extracts and actives that plain water cannot. It also thins a formula, which is why watery Korean essences lean on it.
- Saccharomyces Ferment ferment
- Saccharomyces Ferment is a brewer's yeast ferment. It supplies amino acids, sugars and B vitamins and is used as a conditioning, hydrating ferment.
- Cryptomeria Japonica Leaf Extract plant extract
- Cryptomeria Japonica is Japanese cedar. Its leaf extract is used as an aromatic antioxidant plant extract.
- Nelumbo Nucifera Leaf Extract plant extract
- Nelumbo Nucifera is the sacred lotus. Its leaf extract carries flavonoids and is used as a conditioning antioxidant extract.
- Pinus Palustris Leaf Extract plant extract
- Pinus Palustris is longleaf pine. Its needle extract carries plant antioxidants and appears in Korean formulas alongside other conifer extracts.
- Ulmus Davidiana Root Extract plant extract
- Ulmus Davidiana is Japanese elm, whose inner bark yields a naturally slippery mucilage. Korean formulas use the root extract for that cushioned feel and for the look of reactive skin.
13 more explained
- Oenothera Biennis (Evening Primrose) Flower Extract plant extract
- Evening Primrose Flower Extract is used as a conditioning plant extract. The seed oil of the same plant is the better known part, and it is a different ingredient.
- Pueraria Lobata Root Extract plant extract
- Pueraria Lobata is kudzu. Its root extract carries isoflavones, plant compounds structurally similar to oestrogen, and Korean formulas use it for the look of thinning, less resilient skin.
- Melaleuca Alternifolia (Tea Tree) Leaf Oil fragrance component
- Tea Tree Leaf Oil is an essential oil from an Australian shrub, carrying terpinen-4-ol. Korean formulas use it in products aimed at blemish-prone skin; it is potent, aromatic, and one of the essential oils most likely to bother reactive skin.
- Allantoin active
- Allantoin is a comfrey-derived compound used to condition skin and soften the outer layer so it feels smoother. It is one of the standard additions to a formula built for easily irritated skin.
- Caprylyl Glycol preservative booster
- Caprylyl Glycol is a glycol that conditions skin and, more importantly, strengthens a preservative system so less of the traditional preservative is needed. It appears in most modern formulas built without parabens.
- Ethylhexylglycerin preservative booster
- Ethylhexylglycerin softens skin and boosts a preservative system, which is why it is nearly always sitting beside phenoxyethanol or 1,2-hexanediol. It also cuts down the odour bacteria produce, so it turns up in deodorising products.
- Betaine Salicylate exfoliant
- Betaine Salicylate is a gentler salicylic derivative. Korean formulas use it at around 2 to 4 percent, which is roughly comparable to a low-strength salicylic acid, and it is easier on the skin barrier.
- Citric Acid pH adjuster
- Citric Acid is used in tiny amounts to bring a formula to the pH its actives need, not as an exfoliant at that level. It is an AHA, so at much higher concentrations it can also exfoliate.
- Ethyl Hexanediol humectant
- Ethyl Hexanediol is a glycol that hydrates and makes a formula less hospitable to microbes, the same double role 1,2-hexanediol plays.
- 1,2-Hexanediol humectant
- 1,2-Hexanediol is a glycol used for two reasons: it holds water like glycerin, and it makes a formula harder for microbes to live in, so less traditional preservative is needed. Korean formulas use it heavily for that second reason.
- Trisodium Ethylenediamine Disuccinate chelator
- A readily biodegradable chelator used in place of EDTA. It ties up trace metal ions in the water so they cannot spoil the formula.
- Sodium Benzoate preservative
- Sodium Benzoate is a mild preservative that works only in acidic formulas. It is usually paired with potassium sorbate, and the pair is the standard choice where a brand wants no phenoxyethanol.
- Disodium EDTA chelator
- EDTA is a chelator: it locks up trace metal ions from water and packaging that would otherwise turn a formula cloudy, off-colour or rancid. It does nothing to skin and appears at a fraction of a percent.
- Market
- Korean market, the version sold in Korea
- EAN (barcode)
- 8809416470511
- Made in
- Republic of Korea
- Volume
- 150ml
- Category
- Cleanser / Low-pH gel cleanser
- Actives
- Allantoin, Betaine Salicylate, Tea Tree
- Ships from
- California or Korea
LightTextureRich
MatteFinishDewy
Orders ship from California or direct from Korea with tracked delivery to your door, and both routes carry the same Korean-market release. Shipping is free on orders of $100 or more. Returns are accepted for 30 days, by mail.
We split shipments free, so one out-of-stock item never holds up the rest of your order.
Where this unit came from
- 1Seoul
Bought as Korean-market stock - 2Barcode
Listed against the Korean barcode on its box - 3California or Korea
Ships to you from either, as the same Korean-market release
We stock the version of a formula that is sold in Korea, not the release a brand prepares for another market under the same name. The barcode in the specification above is the Korean-market one and it is printed on the box you receive.
Every unit keeps its original barcode and batch code intact, so the unit in your hands can be checked against the brand’s own records.
Every order ships from California or direct from Korea, and returns run for 30 days.
Every claim on this page traces to the unit in the box, the barcode, the batch code and the price you can read for yourself.
Key benefits
- Cocamidopropyl betaine and sodium lauroyl methyl isethionate are ingredients two and three, mild amphoteric and isethionate surfactants rather than a harsher sulfate
- Styrax japonicus extract and Saccharomyces ferment carry the botanical, fermented character COSRX's low-pH line is known for
- Built to leave the skin's own acid mantle intact, the premise the whole low-pH line is named for
- 150 ml, sized for daily AM use as the first or only morning cleanse
- Sourced as the original Korean-market COSRX release, not a US-shelf reformulation
Inside the formula
Inside the formula
25
Ingredients declared
No fragrance
on the list
Reviews
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COSRX Low pH Good Morning Gel Cleanser
How it felt, how your skin took it, what you layer it with. Straight answers help the next person choose.
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Creators trying on authentic Korean skincare routines and products from us.
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A first try of the Dr. Althea serum on camera.
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COSRX, Korean-market original
Low-pH gel cleanser, 150 ml, on mild Betaine surfactants.
Verify your unit when it arrives
Verify your unit when it arrives
Korean-market stock with the original barcode and batch code intact, exactly as it left Korea.
COSRX verifies units itself. Find the verification page on cosrx.com and enter the batch number and expiration date printed on your unit. Read them off the package rather than from us, which is the point.
Source: COSRX FAQ
On the unit itself
- The Korean-market barcode, unaltered from the retail package.
- The manufacturer’s batch code, exactly as the maker printed it.
정품Genuine article, Korean-market stock
What professionals say
What professionals say
What skin-care professionals say about skin care, quoted from the medical sources linked beside each.
Your skin barrier is basically your outer layer of the skin.
Melissa Piliang, MDDermatologist, Cleveland Clinic Pretty much every step of a Korean skin care routine is going to have some component of hydration.
Alok Vij, MDDermatologist, Cleveland Clinic
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