COSRX Low pH Good Morning Gel Cleanser Review: Gentle, but Not an Acne Wash

COSRX Low pH Good Morning Gel Cleanser is a gentle, mildly acidic gel wash that suits oily, combination and normal skin and costs about $2.76 an ounce. It cleans well without the tight feeling of a high-pH foam, and its pH is listed at 5.31. Don't buy it as an acne treatment, though: its tea tree oil and betaine salicylate sit low on the list, and it isn't a salicylic acid cleanser.

Before you buy, you can scan the tube's barcode or label with the ingredient scanner in Pori to check its ingredients against your skin type. Pori reads the label; it doesn't diagnose skin conditions.

Below we go through every ingredient, what low pH means, the evidence for tea tree oil and betaine salicylate, who it suits and who should skip it, sizes and price per ounce, how to use it, and alternatives. We compared published ingredient lists, brand claims and listed prices; we did not test these products on skin.

What is the COSRX Low pH Good Morning Gel Cleanser?

It's one of the Korean brand's best-known products, a clear gel that lathers lightly. COSRX describes it as a gentle gel type cleanser with mildly acidic pH level that cleanses without stripping, says it's great for all skin types, and lists its key ingredients as betaine salicylate (BHA) and tea tree oil. Despite the name, the brand says to use it morning and night.

What's in COSRX Good Morning Cleanser? The full ingredient list

The US list on cosrx.com is 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 and disodium EDTA.

• Cocamidopropyl betaine and sodium lauroyl methyl isethionate: mild cleansing agents. There's no sodium lauryl or laureth sulfate.
• Sodium chloride and polysorbate 20: salt to thicken the gel and a solubilizer.
• Styrax japonicus extract and six other plant extracts: Japanese snowbell, cedar, lotus leaf, pine, elm root, evening primrose and kudzu root, in small amounts.
• Saccharomyces ferment: a yeast ferment, common in Korean skincare.
• Tea tree leaf oil: 15th on the list, after all the plant extracts.
• Allantoin: a soothing, skin-conditioning ingredient.
• Betaine salicylate: a salicylic acid compound, 19th on the list, after the preservative boosters caprylyl glycol and ethylhexylglycerin.
• Citric acid: adjusts the pH down to its mildly acidic level.
• Butylene glycol, 1,2-hexanediol, ethyl hexanediol: humectants and solvents.
• Caprylyl glycol, ethylhexylglycerin, sodium benzoate, trisodium ethylenediamine disuccinate, disodium EDTA: preservatives and chelators.

One catch for fragrance-sensitive skin: the UK listing at Lookfantastic shows a different version with parfum and limonene and no tea tree oil. If you avoid fragrance, read the tube you're actually holding.

Why does a low-pH cleanser matter?

Healthy skin is acidic. A multicenter study of 330 people estimated the natural skin surface pH at on average 4.7, below 5, and found that skin with a pH under 5 had better barrier function, moisture and less scaling than skin above 5. It also found that soaps and even plain tap water can raise skin pH for hours. Traditional bar soaps are alkaline, which is part of why they leave skin feeling tight.

At 5.31, this gel sits much closer to skin's own pH than soap does. That's a sensible design, and it's why many people with combination skin find it comfortable twice a day. A low pH doesn't make a cleanser treat anything, though, and plenty of non-Korean syndet cleansers are also mildly acidic. Our guide to sulfates in face wash explains why the cleansing agents matter as much as the pH.

Do tea tree oil and betaine salicylate help acne?

Tea tree oil has real but modest evidence, all from leave-on products. A randomized, placebo-controlled trial of a 5% tea tree oil gel in 60 people with mild to moderate acne found it reduced lesion counts and severity. An older trial found 5% tea tree oil gel worked against acne like 5% benzoyl peroxide but more slowly, with fewer side effects. A 2026 meta-analysis of seven studies concluded it gives a modest reduction in acne severity. In this cleanser, tea tree oil comes after seven plant extracts and is rinsed off within a minute, so expect little acne benefit from it.

Betaine salicylate is a cousin of salicylic acid, often described as a milder version. US acne cleansers that treat breakouts use salicylic acid at 0.5% to 2% as the regulated active; betaine salicylate isn't on that list, so this gel is sold as a cosmetic and can't claim to treat acne. It also sits near the end of the ingredient list. If you want a salicylic acid wash, see our best salicylic acid cleanser roundup or salicylic acid for blackheads.

The FDA's general advice for BHA products is to use sun protection. That matters more for leave-on BHAs, but daily sunscreen is a good habit either way.

Who is the Good Morning Gel Cleanser for, and who should skip it?

It suits you if you:

• Have oily, combination or normal skin and want a light gel wash for morning and night.
• Find foaming cleansers leave your skin tight and want a mildly acidic alternative.
• Use acne treatments or retinoids and want a cleanser that doesn't add another strong active.
• Want an inexpensive first step in a Korean skincare routine, or the second step of a double cleanse.

Look elsewhere if you:

• Are allergic to tea tree oil or other essential oils: DermNet lists tea tree oil among essential oils that commonly cause allergic contact dermatitis.
• Have very dry or eczema-prone skin: a creamy, non-foaming cleanser will feel more comfortable. See our best cleanser for dry skin.
• Need an acne treatment: choose a benzoyl peroxide or 2% salicylic acid wash instead. Our best face wash for acne compares them.
• Avoid all fragrance: tea tree oil carries a scent, and the UK version lists parfum.

How much does COSRX Good Morning Cleanser cost?

The 150 ml tube was backordered on cosrx.com when we checked, and it's widely sold on Amazon and at other US retailers, often on sale.

How do you use it?

1. Remove makeup and sunscreen first if you wear them. COSRX says to use it after removing makeup; an oil or balm cleanser handles that step.
2. Wet your face and hands, squeeze a small amount onto your hand and work it into a light lather.
3. Massage gently over your face, avoiding the eyes and mouth.
4. Rinse with lukewarm water and pat dry.
5. Follow with moisturizer, and sunscreen in the morning. Our morning skincare routine shows the order.

What are the best alternatives to COSRX Low pH Good Morning?

• CeraVe Renewing SA Cleanser: a fragrance-free gel with salicylic acid, ceramides and niacinamide, $15.99 on cerave.com, if you want gentle exfoliation for rough, bumpy skin.
• Cetaphil Gentle Exfoliating SA Cleanser: fragrance-free with salicylic acid, mandelic acid and gluconolactone, for sensitive skin that wants mild exfoliation.
• La Roche-Posay Toleriane Purifying Foaming Cleanser: a fragrance-free foaming gel with niacinamide for oily, sensitive skin, with no essential oils.
• The INKEY List Salicylic Acid Cleanser: 2% salicylic acid with zinc PCA, if you want an actual acne active in your wash.

For the rest of the brand, read our COSRX skincare guide and the best COSRX products, or browse cleansers for oily skin.

Is the COSRX Low pH Good Morning Gel Cleanser worth it?

Yes, as a cheap, gentle everyday wash for oily and combination skin. Its strengths are the mild cleansers and the skin-friendly pH. Its weaknesses are the essential oil, and the fact that its headline actives are too low and too briefly on the skin to treat acne. Buy it for comfortable cleansing, pair it with a separate acne treatment if you need one, and choose a fragrance-free wash if tea tree oil bothers you.