COSRX Low pH BHA Overnight Mask Review

COSRX Low pH BHA Overnight Mask
7.8
/ 10
Moisturizing
10.0 Humectancy icon Humectancy
5.5 Occlusivity icon Occlusivity
0.4Anti-wrinkle icon/ 10
Anti-wrinkle
Ingredients

COSRX Low pH BHA Overnight Mask Ingredients

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Full Ingredient List (INCI):

Centella Asiatica Leaf Water, Butylene Glycol, Helianthus Annuus (Sunflower) Seed Oil, Glycerin, Betaine, Panthenol, Cetearyl Alcohol, Dimethicone, Elaeis Guineensis (Palm) Kernel Oil, Beeswax, Gluconolactone, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Cetearyl Olivate, Sorbitan Olivate, Caprylic/Capric Triglyceride, 1,2-Hexanediol, Betaine Salicylate, Ethylhexylglycerin, Lactic Acid, Water, Niacinamide, Xanthan Gum, Sodium Hydroxide, Ethyl Hexanediol, Melaleuca Alternifolia (Tea Tree) Leaf Oil
Review

Does COSRX Low pH BHA Overnight Mask Work?

 
According to CreamScan's analysis of the ingredient list, here’s what COSRX Low pH BHA Overnight Mask has to offer:
 
✅ Significant moisturizing. It has a moisturizing rating of 7.8 out of 10.
✅ Slight anti-wrinkle effect: COSRX Low pH BHA Overnight Mask has an anti-wrinkle rating of 0.4 out of 10, so you may expect a positive, although insignificant, effect on wrinkles.

  

Key Benefits of COSRX Low pH BHA Overnight Mask

 
These are the key benefits you can expect from using COSRX Low pH BHA Overnight Mask:
 

🔵🔵 Perfect Moisturizer for Normal to Dry Skin with a Balanced Texture, Neither Too Light nor Too Heavy

According to CreamScan analysis, COSRX Low pH BHA Overnight Mask is highly moisturizing, with a moisturizing rating of 7.8 out of 10.

Is it more humectant or occlusive? Significantly more humectant. It has a maximum humectancy of 10 out of 10, primarily due to the substantial concentration of Butylene Glycol (est. ≈16.5%) and Glycerin (est. ≈4.5%), and a moderate occlusivity of 5.5 out of 10, mainly due to the high content of Helianthus Annuus (Sunflower) Seed Oil (est. ≈8.3%).

This type of moisturizer is ideal for people with normal skin who want maximum hydration in a formula with a balanced texture - neither too light nor too heavy. It combines a very high concentration of humectants with a moderate amount of occlusive ingredients to deliver effective dual-action moisturizing for normal skin.

This product may also be a good choice for people with normal to dry skin for daily hydration.

Please refer to the Ratings section below for details of the moisturizing rating calculation.

🟣 Slight Anti-Wrinkle Efficacy

According to CreamScan analysis, COSRX Low pH BHA Overnight Mask has a slight anti-wrinkle rating of 0.4 out of 10.

It contains one ingredient with proven anti-wrinkle efficacy: Niacinamide (est. ≈0.3%),
 one of the most effective and well-researched anti-wrinkle ingredients. A clinical study involving 30 participants (Kawada et al.) confirmed that a cream with 4% niacinamide reduced the average depth of wrinkles around the eyes by 9% after 8 weeks of use, compared to a vehicle (the same formulation without niacinamide).
 
Among others, COSRX Low pH BHA Overnight Mask also contains Gluconolactone, an ingredient often marketed as effective in reducing wrinkles. However, the studies supporting the anti-wrinkle claims of Gluconolactone provide insufficient evidence of its efficacy according to CreamScan Research Evaluation Standards.
 
While this does not categorically rule out the possibility that Gluconolactone may reduce wrinkles, its efficacy is not supported by convincing, vehicle-controlled, double-blind clinical studies - at least none that were available to the CreamScan team at the time of publication.
 
Therefore, this ingredient does not contribute to the anti-wrinkle rating.
 
📌 Moisturizers, when used regularly, are proven to prevent wrinkle formation and even reduce existing wrinkles. Therefore, this product, like any other moisturizer, can deliver some additional anti-wrinkle effects through its moisturizing action.
 

Please refer to the Ratings section below for details of the anti-wrinkle rating calculation.

📌 Please note that this is not a complete list of benefits. We are in the process of enhancing our model to incorporate anti-pigmentation, exfoliation and anti-acne ratings.

Things to Be Aware Of: COSRX Low pH BHA Overnight Mask

 
CreamScan identified a few things to consider before adding COSRX Low pH BHA Overnight Mask to your skincare routine:
 

⚠️ If It’s an Exfoliator, It May Increase Skin Photosensitivity Due to Lactic Acid

This product contains lactic acid, a popular AHA known for its ability to gently exfoliate and brighten the skin. It works by removing dead skin cells, revealing new, more delicate skin that is more vulnerable to sun damage.

In smaller quantities, lactic acid is often used as a pH adjuster and may not significantly contribute to exfoliation. However, at higher concentrations, it functions as an effective exfoliant with benefits and risks similar to other AHAs. Products with AHAs, including lactic acid, may increase skin sensitivity, making it more prone to sunburn or irritation when exposed to UV rays.

If this product is designed for exfoliation, applying a broad-spectrum sunscreen with at least SPF 30 daily is essential to protect your skin. Always check the label or the manufacturer’s website for specific usage instructions.

Pros & Cons of COSRX Low pH BHA Overnight Mask

 
Here’s an overview of the pros and cons of COSRX Low pH BHA Overnight Mask to help you decide if it’s the right choice for your skincare routine:
 

🟩 Pros:

✅ Perfect for moisturizing normal skin
Balanced texture, neither too light nor too heavy
Provides slight anti-wrinkle efficacy
 

⭕ Cons: 

✅ We couldn't find any
   

Summary: COSRX Low pH BHA Overnight Mask

 
Based on the ingredient list analysis, CreamScan AI suggests that COSRX Low pH BHA Overnight Mask
 is an ideal moisturizer for normal skin, combining a very high concentration of humectants with a significant amount of occlusive ingredients in a balanced texture - neither too light nor too heavy.
 
COSRX Low pH BHA Overnight Mask contains ingredients with proven evidence of anti-wrinkle efficacy that may offer a slight anti-wrinkle effect. As a result, you can expect a positive, though relatively minimal, impact on wrinkles.
 
 
That said, there are some things about COSRX Low pH BHA Overnight Mask worth noting.
 
📌 Fact check. At CreamScan, we are committed to accuracy and fairness. If you spot any errors or something that doesn’t seem right, please click here to let us know. We regularly update the ingredient lists and monitor the latest research on ingredient efficacy to ensure that our information remains as complete and precise as possible. The information provided here is for informational purposes only and does not substitute professional advice. We do not guarantee the efficacy or safety of any product, as individual results may vary.

 

Ingredient Breakdown

Est. % Ingredient Origin Functions
56.4
16.5
8.3
4.5
3
2.3
1.5
1.1
1
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.9
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
Est. %
Centella Asiatica Leaf Water
Function:
Origin:
Butylene Glycol
Function:
Origin:
Helianthus Annuus (Sunflower) Seed Oil
Function:
Origin:
Glycerin
Function:
Origin:
Betaine
Function:
Origin:
Panthenol
Function:
Origin:
Cetearyl Alcohol
Function:
Origin:
Dimethicone
Function:
Origin:
Elaeis Guineensis (Palm) Kernel Oil
Function:
Origin:
Beeswax
Function:
Origin:
Gluconolactone
Function:
Origin:
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Function:
Origin:
Cetearyl Olivate
Function:
Origin:
Sorbitan Olivate
Function:
Origin:
Caprylic/Capric Triglyceride
Function:
Origin:
1,2-Hexanediol
Function:
Origin:
Betaine Salicylate
Function:
Origin:
Ethylhexylglycerin
Function:
Origin:
Lactic Acid
Function:
Origin:
Water
Function:
Origin:
Niacinamide
Function:
Origin:
Xanthan Gum
Function:
Origin:
Sodium Hydroxide
Function:
Origin:
Ethyl Hexanediol
Function:
Origin:
Melaleuca Alternifolia (Tea Tree) Leaf Oil
Function:
Origin:

Ratings

All humectants
27.5
16.5
4.5
3
2.3
0.3
0.3
0.3
0.3
Benchmark
10
All occlusives
11.0
8.3
1.1
1.0
0.3
0.3
Benchmark
20
Moisturizing rating
7.8
Ingredient Est. % Benchmark Raiting
Humectancy All humectants 27.5 10
10.0
16.5
4.5
3
2.3
0.3
0.3
0.3
0.3
Occlusivity All occlusives 11.0 20
5.5
8.3
1.1
1.0
0.3
0.3
Moisturizing rating
7.8
Ingredient Est. % Benchmark Humectancy
16.5
4.5
3
2.3
0.3
0.3
0.3
0.3
All humectants 27.5 10
10
All humectants
27.5
16.5
4.5
3
2.3
0.3
0.3
0.3
0.3
Benchmark
10
Ingredient Est. % Benchmark Occlusivity
8.3
1.1
1
0.3
0.3
All occlusives 11.0 20
5.5
All occlusives
11.0
8.3
1.1
1.0
0.3
0.3
Benchmark
20
Ingredient
Ingredient anti-wrinkle power
when present at, %
in this formula est. %
Rating
6 /10 4 0.3 0.4
n/a
- 0.3 -
Total
0.4
Niacinamide
0.4
Ingredient anti-wrinkle power
6 /10
when present at, %
4
in this formula, est. %
0.3
Gluconolactone
-
Ingredient anti-wrinkle power
n/a
when present at, %
-
in this formula, est. %
0.3
Anti-wrinkle rating
0.4
Ingredient Est. % Benchmark
Rich in Antioxidants
0.3
0.3
All antioxidants 0.6 3 No
All antioxidants
0.6
Niacinamide
0.3
Melaleuca Alternifolia (Tea Tree) Leaf Oil
0.3
Benchmark
3
Ingredient Est. % Benchmark
Rich in Soothing
2.3
0.3
0.3
All soothing 2.9 5 No
All soothing
2.9
2.3
0.3
0.3
Benchmark
5

Ingredients explained

Centella Asiatica Leaf Water
Est. %56.4
Function
Origin
Centella Asiatica Leaf Water
Butylene Glycol
Est. %16.5
Function
Origin
Butylene Glycol

A clear, colorless liquid humectant that draws moisture to the skin. The humectancy of butylene glycol, owed to its two hydroxyl groups, is quite considerable, although not as powerful as glycerin, which contains three hydroxyl groups.

Helianthus Annuus (Sunflower) Seed Oil
Est. %8.3
Function
Origin
Helianthus Annuus (Sunflower) Seed OilA fatty oil expressed from sunflower seeds and one of the most commonly used oils in skincare. It has great emollient and occlusive moisturizing properties. Sunflower oil is one of the richest sources of vitamin E – an important skin antioxidant.
Glycerin
Est. %4.5
Function
Origin
Glycerin

The most popular moisturizing ingredient in the world. It is a powerful humectant – cheap yet very effective.

Betaine
Est. %3
Function
Origin
BetaineAn ingredient derived from the sucrose in sugar beets. It has a negative chemical charge and a positive chemical charge on the same molecule. This allows betaine to be hygroscopic or humectant and thus provide moisturization by drawing water to the skin.
Panthenol
Est. %2.3
Function
Origin
PanthenolA popular soothing and moisturizing derivative of vitamin B5. Panthenol is particularly beneficial for dry, flaking, burned, or damaged skin. It is used to alleviate the symptoms of a rash, dermatitis, eczema, chapped lips, and sunburn.
Cetearyl Alcohol
Est. %1.5
Function
Origin
Cetearyl AlcoholA blend of cetyl alcohol and stearyl alcohol, the fatty alcohols that are derived from palm oil. It helps to create emulsions that give off a soft and silky emollient feel and also increase product thickness.
Dimethicone
Est. %1.1
Function
Origin
DimethiconeThe most common silicone in skincare. It forms a silky, smooth film on the skin’s surface and can help to prevent water loss. It also aids in wound healing and can treat and soften scars. Dimethicone is considered to be very safe for use.
Elaeis Guineensis (Palm) Kernel Oil
Est. %1
Function
Origin
Elaeis Guineensis (Palm) Kernel Oil
Beeswax
Est. %0.3
Function
Origin
BeeswaxA waxy substance made by bees while they are building their honeycombs. It is an occlusive moisturizing and emollient ingredient with wound healing and antimicrobial properties similar to those of honey. Its bleached, purified form is called Cera alba.
Gluconolactone
Est. %0.3
Function
Origin
GluconolactoneA PHA derived from glucose. It has exfoliating and humectant properties and acts as a penetration enhancer for other ingredients. It has also been shown to assist in the treatment of acne and the prevention of photoaging.
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Est. %0.3
Function
Origin
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate CopolymerAn emulsion stabilizer and thickener that helps to create a pleasant, satiny, and light formula texture. It works by forming a gel-like network within water or oil, which both stabilizes other ingredients and produces a thickening effect.
Cetearyl Olivate
Est. %0.3
Function
Origin
Cetearyl Olivate

A multifunctional ingredient derived from plants that primarily serves as an emulsifier. Supplied as a waxy ivory-colored flake, it can also be used as an emollient and slip modifier that gives a product an overall light, silky finish.

Sorbitan Olivate
Est. %0.3
Function
Origin
Sorbitan OlivateAn ester of sorbitol (a type of sugar alcohol) and olive oil fatty acids. It is used as an emulsifying agent to stabilize oil droplets in water (or vice versa).
Caprylic/Capric Triglyceride
Est. %0.3
Function
Origin
Caprylic/Capric TriglycerideA natural occlusive moisturizing and emollient ingredient, it is a blend of glycerin and two fatty acids, caprylic and capric acid. It creates an oil-based protective layer on the skin, thereby preventing water loss.
1,2-Hexanediol
Est. %0.3
Function
Origin
1,2-HexanediolA multi-functional formula helper. It is a well-studied preservtive against bacteria and can help pigments and fragrances disperse evenly in a formula.
Betaine Salicylate
Est. %0.9
Function
Origin
Betaine Salicylate
Ethylhexylglycerin
Est. %0.3
Function
Origin
EthylhexylglycerinA preservative booster derived from glycerin. It is commonly paired with other preservatives to improve their efficacy. Ethylhexylglycerin is also a humectant due to its chemical base of glycerin.
Lactic Acid
Est. %0.3
Function
Origin
Lactic AcidThe most popular AHA in skincare and less irritating than glycolic acid. It can be naturally found in sour milk. It is a humectant moisturizing, pH stabilizing, and gently exfoliating ingredient, able to soften dry, cracked, and peeling skin.
Water
Est. %0.3
Function
Origin
WaterThe most used ingredient in skincare. Its concentration defines the product texture: rich creams may have about 50% of water while a light jelly about 90%. Water doesn’t moisturize the skin by itself and is used in skincare as a solvent for other ingredients.
Niacinamide
Est. %0.3
Function
Origin
Niacinamide

Also known as vitamin B3, this ingredient is a true superstar with confirmed moisturizing, anti-acne, hyperpigmentation, and antioxidant benefits. Two studies confirm its significant anti-wrinkle efficacy.

Xanthan Gum
Est. %0.3
Function
Origin
Xanthan GumA natural multi-functional ingredient that originates from fermented sugars. Xanthan gum acts as a viscosity-building agent to thicken skincare products. It is also an excellent stabilizer and works well to hold other ingredients together.
Sodium Hydroxide
Est. %0.3
Function
Origin
Sodium Hydroxide

An ingredient that is able to bring the pH of a product up, thereby making it less harsh on the skin.

Ethyl Hexanediol
Est. %0.3
Function
Origin
Ethyl HexanediolA synthetic solvent used to dissolve difficult ingredients. It also has a pleasant scent and could be used to contribute to product fragrance.
Melaleuca Alternifolia (Tea Tree) Leaf Oil
Est. %0.3
Function
Origin
Melaleuca Alternifolia (Tea Tree) Leaf OilA fragrant and antioxidant essential tea tree oil praised for its antiseptic and antimicrobial properties. Tea tree oil helps to treat acne, inflamed skin, and small wounds. It might, however, cause allergies and skin irritations.