COSRX The 6 Peptide Skin Booster Serum

COSRX The 6 Peptide Skin Booster Serum
5.2
/ 10
Moisturizing
10.0 Humectancy icon Humectancy
0.3 Occlusivity icon Occlusivity
2.2Anti-wrinkle icon/ 10
Anti-wrinkle

Review

Does COSRX The 6 Peptide Skin Booster Serum work?

Based on the ingredient list analysis by CreamScan AI, these are the key benefits you can expect from using COSRX The 6 Peptide Skin Booster Serum:

  • Strong humectant moisturizing. This lightweight, humectant-rich product, ideal for oily skin, has a moisturizing rating of 5.2 out of 10.
  • Some anti-wrinkle efficacy: COSRX The 6 Peptide Skin Booster Serum has an anti-wrinkle rating of 2.2 out of 10 so you may expect some, although limited, effect on wrinkles.

Lightweight moisturizer ideal for oily skin and a humectant boost for any skincare routine

According to CreamScan analysis, COSRX The 6 Peptide Skin Booster Serum is quite moisturizing, with a moisturizing rating of 5.2 out of 10.

Is it more humectant or occlusive? Significantly more humectant. It has a low occlusivity of 0.3 out of 10 and a maximum humectancy of 10 out of 10, primarily due to the high content of Glycerin (est. ≈4.0%) and Pentylene Glycol (est. ≈3.0%).

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.

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.

Some anti-wrinkle efficacy

According to CreamScan analysis, COSRX The 6 Peptide Skin Booster Serum has a slight anti-wrinkle rating of 2.2 out of 10.

It contains one ingredient with proven anti-wrinkle efficacy: Niacinamide (est. ≈1.5%), 
 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 The 6 Peptide Skin Booster Serum also contains some ingredients often marketed as effective in reducing wrinkles, specifically Acetyl Hexapeptide-8, Copper Tripeptide-1, Dipeptide Diaminobutyroyl Benzylamide Diacetate, Acetyl Glucosamine, and Adenosine. However, the studies supporting the anti-wrinkle claims of these ingredients provide insufficient evidence of efficacy according to CreamScan Research Evaluation Standards. Therefore, these ingredients do 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 anti-wrinkle effects through its moisturizing action.
 

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

Ingredients

Est. % Ingredient Origin Functions
70
6
4
3
2
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
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:
Dipropylene Glycol
Function:
Origin:
Glycerin
Function:
Origin:
Pentylene Glycol
Function:
Origin:
1,2-Hexanediol
Function:
Origin:
Niacinamide
Function:
Origin:
Acetyl Hexapeptide-8
Function:
Origin:
Copper Tripeptide-1
Function:
Origin:
sh-Polypeptide-121
Function:
Origin:
Dipeptide Diaminobutyroyl Benzylamide Diacetate
Function:
Origin:
Oligopeptide-68
Function:
Origin:
Palmitoyl Tripeptide-8
Function:
Origin:
Allantoin
Function:
Origin:
Sodium Hyaluronate
Function:
Origin:
Acetyl Glucosamine
Function:
Origin:
Serine
Function:
Origin:
Alanine
Function:
Origin:
Glycine
Function:
Origin:
Threonine
Function:
Origin:
Arginine
Function:
Origin:
Proline
Function:
Origin:
Betaine
Function:
Origin:
Sodium PCA
Function:
Origin:
Sodium Lactate
Function:
Origin:
PCA
Function:
Origin:
Glutamic Acid
Function:
Origin:
Lysine HCl
Function:
Origin:
Tocopherol
Function:
Origin:
Dextran
Function:
Origin:
Glycine Soja (Soybean) Oil
Function:
Origin:
Hydrogenated Lecithin
Function:
Origin:
Ammonium Acryloyldimethyltaurate/VP Copolymer
Function:
Origin:
Polyacrylate Crosspolymer-6
Function:
Origin:
Butylene Glycol
Function:
Origin:
Xanthan Gum
Function:
Origin:
Ethylhexylglycerin
Function:
Origin:
Adenosine
Function:
Origin:
Polyquaternium-51
Function:
Origin:
Disodium EDTA
Function:
Origin:
Citric Acid
Function:
Origin:
Caprylyl Glycol
Function:
Origin:
t-Butyl Alcohol
Function:
Origin:
Potassium Sorbate
Function:
Origin:
Sodium Oleate
Function:
Origin:

Ratings

All humectants
13.9
4
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
0.3
0.3
0.3
Benchmark
10
All occlusives
0.6
0.3
0.3
Benchmark
20
Moisturizing rating
5.2
Ingredient Est. % Benchmark Raiting
Humectancy All humectants 13.9 10
10.0
4
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
0.3
0.3
0.3
Occlusivity All occlusives 0.6 20
0.3
0.3
0.3
Moisturizing rating
5.2
Ingredient Est. % Benchmark Humectancy
4
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
0.3
0.3
0.3
All humectants 13.9 10
10
All humectants
13.9
4
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
0.3
0.3
0.3
Benchmark
10
Ingredient Est. % Benchmark Occlusivity
0.3
0.3
All occlusives 0.6 20
0.3
All occlusives
0.6
0.3
0.3
Benchmark
20
Ingredient
Ingredient anti-wrinkle power
when present at, %
in this formula est. %
Rating
6 /10 4 1.5 2.2
n/a
- 0.3 -
n/a
- 0.3 -
n/a
- 0.3 -
n/a
- 0.3 -
n/a
- 0.3 -
Total
2.2
Niacinamide
2.2
Ingredient anti-wrinkle power
6 /10
when present at, %
4
in this formula, est. %
1.5
Acetyl Hexapeptide-8
-
Ingredient anti-wrinkle power
n/a
when present at, %
-
in this formula, est. %
0.3
Copper Tripeptide-1
-
Ingredient anti-wrinkle power
n/a
when present at, %
-
in this formula, est. %
0.3
Dipeptide Diaminobutyroyl Benzylamide Diacetate
-
Ingredient anti-wrinkle power
n/a
when present at, %
-
in this formula, est. %
0.3
Acetyl Glucosamine
-
Ingredient anti-wrinkle power
n/a
when present at, %
-
in this formula, est. %
0.3
Adenosine
-
Ingredient anti-wrinkle power
n/a
when present at, %
-
in this formula, est. %
0.3
Anti-wrinkle rating
2.2
Ingredient Est. % Benchmark
Rich in Antioxidants
1.5
0.3
0.3
0.3
0.3
All antioxidants 2.7 3 No
All antioxidants
2.7
Niacinamide
1.5
Copper Tripeptide-1
0.3
Sodium Hyaluronate
0.3
Tocopherol
0.3
Glycine Soja (Soybean) Oil
0.3
Benchmark
3
Ingredient Est. % Benchmark
Rich in Soothing
1.5
0.3
0.3
All soothing 2.1 5 No
All soothing
2.1
1.5
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.
Dipropylene Glycol
Est. %6
Function
Origin
Dipropylene GlycolA clear, colorless liquid that has several uses. One of its main functions is as a solvent. Dipropylene glycol is also used to reduce the thickness of skincare products.
Glycerin
Est. %4
Function
Origin
Glycerin

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

Pentylene Glycol
Est. %3
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. %2
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.
Niacinamide
Est. %1.5
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.

Acetyl Hexapeptide-8
Est. %0.3
Function
Origin
Acetyl Hexapeptide-8

A small synthetic peptide that is thought to act similarly to Botox by calming contractions of the facial muscles and reducing expression wrinkles. The effect is only temporary and it does not improve the skin structure in any way.

Copper Tripeptide-1
Est. %0.3
Function
Origin
Copper Tripeptide-1

A skin-identical, copper-binding peptide that promotes the synthesis of all structural elements in the skin.

sh-Polypeptide-121
Est. %0.3
Function
Origin
sh-Polypeptide-121
Dipeptide Diaminobutyroyl Benzylamide Diacetate
Est. %0.3
Function
Origin
Dipeptide Diaminobutyroyl Benzylamide DiacetateA synthetically made peptide similar to the proteins in viper venom. Similarly to Botox, it works by inhibiting contractions of mimic muscles, thereby offering a short-term reduction in mimic wrinkles.
Oligopeptide-68
Est. %0.3
Function
Origin
Oligopeptide-68

Description is coming soon

Palmitoyl Tripeptide-8
Est. %0.3
Function
Origin
Palmitoyl Tripeptide-8

Description is coming soon

Allantoin
Est. %0.3
Function
Origin
AllantoinA fluffy, white powder that acts as a humectant due to its water-loving chemistry and as an exfoliant that helps to remove dead skin cells. It has also been shown to be very soothing to irritated and inflamed skin.
Sodium Hyaluronate
Est. %0.3
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.

Acetyl Glucosamine
Est. %0.3
Function
Origin
Acetyl GlucosamineA body-natural amino-saccharide used in skincare as an anti-pigment ingredient. Some other benefits of acetyl glucosamine include decreased skin flakiness, improved wound healing, and even a slight reduction in facial wrinkles.
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.
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.
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.
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.
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).
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.
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.
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.

Dextran
Est. %0.3
Function
Origin
DextranA naturally derived sucrose metabolite that thickens water and bulks emulsions.
Glycine Soja (Soybean) Oil
Est. %0.3
Function
Origin
Glycine Soja (Soybean) OilAn occlusive moisturizing oil expressed from soybeans. It does not leave an oily feeling on the skin due to its low content of saturated fatty acids. Glycine soja oil contains emollient fatty acids and a significant amount of antioxidants.
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.
Ammonium Acryloyldimethyltaurate/VP Copolymer
Est. %0.3
Function
Origin
Ammonium Acryloyldimethyltaurate/VP CopolymerA polymeric ingredient that creates lightweight and refreshing gel textures. It also works as a viscosity controlling agent.
Polyacrylate Crosspolymer-6
Est. %0.3
Function
Origin
Polyacrylate Crosspolymer-6A polymeric ingredient that works best in water-based formulas to create gel textures. It helps to stabilize emulsions and control viscosity.
Butylene Glycol
Est. %0.3
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.

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.
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.
Adenosine
Est. %0.3
Function
Origin
Adenosine

A key molecule responsible for energy transportation, signaling, and enzyme activity. Adenosine is a popular anti-wrinkle ingredient, however, the key study about its anti-wrinkle efficacy (1) does not meet CreamScan Research Evaluation Standards as it is not double-blind.

Polyquaternium-51
Est. %0.3
Function
Origin
Polyquaternium-51A biocompatible phospholipid copolymer that is designed to mimic the lipid-based cell membrane found in human skin. Its main function is as a humectant moisturizer.
Disodium EDTA
Est. %0.3
Function
Origin
Disodium EDTAA synthetic chelator that helps to maintain the look and smell of a product by 'locking up' troublesome metal ions.
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.
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.
t-Butyl Alcohol
Est. %0.3
Function
Origin
t-Butyl Alcohol
Potassium Sorbate
Est. %0.3
Function
Origin
Potassium SorbateA preservative widely used in food and personal care products, available from natural sources or synthetically produced. Potassium sorbate works by inhibiting the growth of yeasts, molds, and some bacteria.
Sodium Oleate
Est. %0.3
Function
Origin
Sodium OleateSodium oleate is a sodium salt of oleic acid. It has the typical properties of soap: it foams in water and emulsifies oil into tiny droplets. It comes in the form of a white powder and is used in skincare products exactly as you would expect – as a cleanser and emulsifier.