COSRX The Hyaluronic Acid 3 Serum Review

COSRX The Hyaluronic Acid 3 Serum
5.4
/ 10
Moisturizing
10.0 Humectancy icon Humectancy
0.8 Occlusivity icon Occlusivity
Rich
in Antioxidants
Review

Does COSRX The Hyaluronic Acid 3 Serum Work?

 
According to CreamScan AI's analysis of the ingredient list, here’s what COSRX The Hyaluronic Acid 3 Serum has to offer:
 
✅ Strong humectant moisturizing. This lightweight, humectant-rich product, ideal for oily skin, has a moisturizing rating of 5.4 out of 10.
✅ Antioxidant protection

  

Key Benefits of COSRX The Hyaluronic Acid 3 Serum

 
These are the key benefits you can expect from using COSRX The Hyaluronic Acid 3 Serum:
 

🔵 Lightweight Humectant Moisturizer Ideal for Oily Skin

According to CreamScan analysis, COSRX The Hyaluronic Acid 3 Serum is quite moisturizing, with a moisturizing rating of 5.4 out of 10.

Is it more humectant or occlusive? Significantly more humectant. It has a low occlusivity of 0.8 out of 10 and a maximum humectancy of 10 out of 10, primarily due to the high content of Butylene Glycol (est. ≈6.0%), Propanediol (est. ≈4.0%) and Glycerin (est. ≈3.1%).

This humectant-rich product, when used alone as a moisturizer, is ideal for oily skin, offering significant hydration in a lightweight, fast-absorbing formula with a minimal amount of occlusive ingredients.

It’s also a great choice for people with normal skin who prefer lightweight moisturizers.

💧 A Humectant Boost for Any Skincare Routine

But it’s not limited to oily skin - such a humectant boost will also positively contribute to the moisturizing efficacy of any skincare routine when used as a step before applying the main moisturizer. This type of formulation is typically used in serums, where a light, fast-absorbing texture is key.

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

🍀 Rich in Skin-Protecting Antioxidants

We estimate that COSRX The Hyaluronic Acid 3 Serum is rich (> 3%) in antioxidants, specifically Sodium Hyaluronate (est. ≈3.0%).

A key benefit of antioxidants is their ability to reduce oxidative stress caused by free radicals and therefore prevent accelerated skin aging. Studies also show that antioxidants can protect against environmental damage such as UV radiation and pollution, and help reduce inflammation and skin redness.

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

Things to Be Aware Of: COSRX The Hyaluronic Acid 3 Serum

 
CreamScan AI identified a few things to consider before adding COSRX The Hyaluronic Acid 3 Serum 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 The Hyaluronic Acid 3 Serum

 
Here’s an overview of the pros and cons of COSRX The Hyaluronic Acid 3 Serum to help you decide if it’s the right choice for your skincare routine:
 

🟩 Pros:

✅ When used alone: Provides humectant-rich moisturizing ideal for oily skin
✅ As part of a routine: A humectant moisturizing boost, beneficial for any skin type
✅ Lightweight texture
✅ Rich in antioxidants that combat oxidative stress associated with accelerated skin aging and defend against environmental damage
 

⭕ Cons: 

✅ We couldn't find any
   

Summary: COSRX The Hyaluronic Acid 3 Serum

 
Based on the ingredient list analysis, CreamScan AI suggests that COSRX The Hyaluronic Acid 3 Serum
, when used alone, delivers lightweight, humectant-rich moisturizing, making it ideal for oily skin. As part of a moisturizing routine, it provides a humectant boost, beneficial for all skin types.
 
With its high antioxidant content, COSRX The Hyaluronic Acid 3 Serum helps protect against free radical damage and offers multiple benefits for all skin types, including preventing premature aging, defending against environmental damage, and calming inflammation.
 
That said, there are some things about COSRX The Hyaluronic Acid 3 Serum 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.

 

Ingredients

Est. % Ingredient Origin Functions
70
6
4
3.1
3
1.5
1.3
1
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
Est. %
Water
Function:
Origin:
Butylene Glycol
Function:
Origin:
Propanediol
Function:
Origin:
Glycerin
Function:
Origin:
Sodium Hyaluronate
Function:
Origin:
Pentylene Glycol
Function:
Origin:
1,2-Hexanediol
Function:
Origin:
Diethoxyethyl Succinate
Function:
Origin:
Sodium Polyacryloyldimethyl Taurate
Function:
Origin:
Betaine
Function:
Origin:
Xanthan Gum
Function:
Origin:
Dimethicone
Function:
Origin:
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Function:
Origin:
Sodium PCA
Function:
Origin:
Sodium Lactate
Function:
Origin:
PCA
Function:
Origin:
Glyceryl Acrylate/Acrylic Acid Copolymer
Function:
Origin:
Hydrogenated Lecithin
Function:
Origin:
Ethylhexylglycerin
Function:
Origin:
Serine
Function:
Origin:
Alanine
Function:
Origin:
Glycine
Function:
Origin:
Sodium Phytate
Function:
Origin:
Sorbitan Isostearate
Function:
Origin:
PVM/MA Copolymer
Function:
Origin:
Glutamic Acid
Function:
Origin:
Citric Acid
Function:
Origin:
Lysine HCl
Function:
Origin:
Threonine
Function:
Origin:
Arginine
Function:
Origin:
Sodium Methyl Stearoyl Taurate
Function:
Origin:
Proline
Function:
Origin:
Ceramide NP
Function:
Origin:
Cholesterol
Function:
Origin:
Caprylic/Capric Triglyceride
Function:
Origin:
Phytosphingosine
Function:
Origin:
Stearic Acid
Function:
Origin:
Oleic Acid
Function:
Origin:
Alcohol
Function:
Origin:
Tocopherol
Function:
Origin:
Lactic Acid
Function:
Origin:
Caprylyl Glycol
Function:
Origin:
Caprylhydroxamic Acid
Function:
Origin:

Ratings

All humectants
22.1
6
4
3.1
3
1.5
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
Benchmark
10
All occlusives
1.5
0.3
0.3
0.3
0.3
0.3
Benchmark
20
Moisturizing rating
5.4
Ingredient Est. % Benchmark Raiting
Humectancy All humectants 22.1 10
10.0
6
4
3.1
3
1.5
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
Occlusivity All occlusives 1.5 20
0.8
0.3
0.3
0.3
0.3
0.3
Moisturizing rating
5.4
Ingredient Est. % Benchmark Humectancy
6
4
3.1
3
1.5
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
All humectants 22.1 10
10
All humectants
22.1
6
4
3.1
3
1.5
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
Benchmark
10
Ingredient Est. % Benchmark Occlusivity
0.3
0.3
0.3
0.3
0.3
All occlusives 1.5 20
0.8
All occlusives
1.5
0.3
0.3
0.3
0.3
0.3
Benchmark
20
Ingredient
Ingredient anti-wrinkle power
when present at, %
in this formula est. %
Rating
None
Total
0
None
Anti-wrinkle rating
0
Ingredient Est. % Benchmark
Rich in Antioxidants
3
0.3
All antioxidants 3.3 3 Rich in antioxidants
All antioxidants
3.3
Sodium Hyaluronate
3
Tocopherol
0.3
Benchmark
3
Ingredient Est. % Benchmark
Rich in Soothing
0.3
All soothing 0.3 5 No
All soothing
0.3
0.3
Benchmark
5

Ingredients explained

Water
Est. %70
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.
Butylene Glycol
Est. %6
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.

Propanediol
Est. %4
Function
Origin
PropanediolAn excellent solvent capable of mixing water with normally water-insoluble ingredients. It also functions as a humectant due to its water-loving alcohol groups. Propanediol can control the viscosity of a product by reducing its thickness.
Glycerin
Est. %3.1
Function
Origin
Glycerin

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

Sodium Hyaluronate
Est. %3
Function
Origin
Sodium Hyaluronate

A sodium salt of famous hyaluronic acid. A potent humectant that hydrates the skin, supports collagen function, and fills out small wrinkles. Sodium hyaluronate also offers soothing and antioxidant properties.

Pentylene Glycol
Est. %1.5
Function
Origin
Pentylene Glycol

A naturally or synthetically derived preservative that exhibits effective antifungal and antibacterial traits. It also acts as a booster for more traditional preservatives. Pentylene glycol can also serve as a moisturizing humectant and solvent.

1,2-Hexanediol
Est. %1.3
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.
Diethoxyethyl Succinate
Est. %1
Function
Origin
Diethoxyethyl Succinate
Sodium Polyacryloyldimethyl Taurate
Est. %0.3
Function
Origin
Sodium Polyacryloyldimethyl Taurate
Betaine
Est. %0.3
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.
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.
Dimethicone
Est. %0.3
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.
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.
Sodium PCA
Est. %0.3
Function
Origin
Sodium PCAOne of the most important parts of the skin's Natural Moisturizing Factor, a mixture of various compounds that keeps the skin’s surface well hydrated. Sodium PCA is used in skincare for its fantastic humectant properties.
Sodium Lactate
Est. %0.3
Function
Origin
Sodium LactateA sodium salt of lactic acid. Its main function is as a humectant but it can also serve as a pH adjuster. Additionally, sodium lactate can also be used as a chemical exfoliant due to its close chemical relation to lactic acid.
PCA
Est. %0.3
Function
Origin
PCAAlso known as pyrrolidone carboxylic acid, this ingredient is one of the main components of the skin's Natural Moisturizing Factor (which prevents the skin’s surface from drying out).
Glyceryl Acrylate/Acrylic Acid Copolymer
Est. %0.3
Function
Origin
Glyceryl Acrylate/Acrylic Acid CopolymerA synthetic humectant moisturizer often paired with glycerin. It also functions as a viscosity-controlling agent that creates gel-like formulas with thicker textures.
Hydrogenated Lecithin
Est. %0.3
Function
Origin
Hydrogenated LecithinA version of plain lecithin that has been saturated with hydrogen atoms. This ingredient can be derived from plants, like soy or sunflower, from egg yolks, or made synthetically. Its major function is to emulsify water and oils.
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.
Serine
Est. %0.3
Function
Origin
SerineA non-essential amino acid, meaning that our body can produce it. It is the largest constituent of the skin's Natural Moisturizing Factor and is used in skincare as a humectant moisturizing ingredient.
Alanine
Est. %0.3
Function
Origin
AlanineA simple amino acid used in skincare as a humectant moisturizing ingredient. It is a part of the so-called Natural Moisturizing Factor, a complex mixture of free amino acids and other water-soluble compounds found in skin cells.
Glycine
Est. %0.3
Function
Origin
GlycineA humectant moisturizing amino acid that is a part of skin's Natural Moisturizing Factor. Some recent studies suggest that it may have barrier repair properties.
Sodium Phytate
Est. %0.3
Function
Origin
Sodium PhytateSodium phytate is a chelating agent that serves to remove heavy metal ions from water. Removing metal ions helps other ingredients, such as antioxidants and preservatives, to perform better and keep products from separating.
Sorbitan Isostearate
Est. %0.3
Function
Origin
Sorbitan IsostearateA mild yet powerful emulsifier primarily utilized to produce water-in-oil emulsions. It helps to create a particularly rich and substantial emulsion.
PVM/MA Copolymer
Est. %0.3
Function
Origin
PVM/MA Copolymer
Glutamic Acid
Est. %0.3
Function
Origin
Glutamic AcidA non-essential amino acid that serves as a building block for all proteins in the body. It is a moisturizing humectant and a part of the skin's Natural Moisturizing Factor, a mixture of amino acids in skin cells that keeps them hydrated.
Citric Acid
Est. %0.3
Function
Origin
Citric AcidA gently exfoliating AHA that helps to remove the top layer of dead skin cells. In comparison to other AHAs, citric acid has been shown to be one of the least effective. It is also very commonly used as a stabilizing and pH-controlling agent.
Lysine HCl
Est. %0.3
Function
Origin
Lysine HClLysine HCl is a chloride salt of lysine, an essential, slightly alkaline amino acid. It has the same function as the non-salt version - it is a humectant moisturizing and emollient ingredient that, due to its sometimes undesirable aroma, is not often used.
Threonine
Est. %0.3
Function
Origin
ThreonineAn essential amino acid that may play a role in collagen production. However, more research is needed in order to confirm or deny these claims.
Arginine
Est. %0.3
Function
Origin
ArginineA humectant amino acid used to attract water to the skin’s surface. It is a part of the skin's Natural Moisturizing Factor, a mixture of various compounds that keeps the skin’s surface well hydrated. Arginine can also be used as a pH adjuster.
Sodium Methyl Stearoyl Taurate
Est. %0.3
Function
Origin
Sodium Methyl Stearoyl Taurate
Proline
Est. %0.3
Function
Origin
ProlineThe best humectant moisturizer of all the amino acids. It is a part of the skin's Natural Moisturizing Factor and increases hydration in the top layers of the skin. It also has antioxidant activity and helps to heal damaged skin.
Ceramide NP
Est. %0.3
Function
Origin
Ceramide NPAlso known as ceramide 3, it is the most common ceramide in our skin. It helps to restore the skin’s lipid barrier and alleviate the symptoms of dry and cracked skin. Research has shown that skin suffering from conditions such as AD lacks ceramides.
Cholesterol
Est. %0.3
Function
Origin
CholesterolAn emollient and important barrier repairing lipid, effective when combined with fatty acids and ceramides. Around 25% of the skin’s lipid layer is made up of cholesterol and it is found in the membrane of every single cell in our body.
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.
Phytosphingosine
Est. %0.3
Function
Origin
PhytosphingosineA key component of ceramides NP, AP, and EOP. It has barrier repair properties and stimulates the production of the skin’s Natural Moisturizing Factor. Phytosphingosine has strong antimicrobial and anti-inflammatory activity, which can be used to treat acne.
Stearic Acid
Est. %0.3
Function
Origin
Stearic AcidA saturated fatty acid found in vegetable butter and animal fats. It is an occlusive moisturizing and emollient ingredient and also helps to maintain the barrier function of the skin.
Oleic Acid
Est. %0.3
Function
Origin
Oleic AcidAn omega-9 fatty acid commonly found in vegetable oils. It is occlusive moisturizing, emollient and emulsifying.
Alcohol
Est. %0.3
Function
Origin
AlcoholAn effective antimicrobial ingredient that kills bacteria, fungi, and even some viruses. It is also an excellent solvent and astringent. Alcohol helps to create lighter and less viscous products. It can, however, be dehydrating and skin-sensitizing.
Tocopherol
Est. %0.3
Function
Origin
Tocopherol

Simply another name for vitamin E. Tocopherol is a fantastic ingredient and especially beneficial for dry and inflamed skin. It has occlusive moisturizing, emollient, antioxidant, and photoprotective properties.

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.
Caprylyl Glycol
Est. %0.3
Function
Origin
Caprylyl GlycolAn emollient that improves product spreadability and offers a silky feel on the skin. It also acts as a preservative booster that improves the efficacy of other preservatives. According to the manufacturer, it is also a humectant moisturizer.
Caprylhydroxamic Acid
Est. %0.3
Function
Origin
Caprylhydroxamic AcidA chelating agent used alongside preservatives in order to boost their antimicrobial activity.