COSRX The 6 Peptide Skin Booster Serum Versus PCA Skin Exlinea Pro Peptide Serum
Updated on August 20, 2024
Overview
What they are
These products are both cruelty-free and reef safe serums. They have a total of 13 ingredients in common
Cool Features
They both contain hyaluronic acid and peptides
Suited For
They're both likely to be good for anti aging, dry skin, brightening skin, sensitive skin, scar healing and dark spots
Free From
They both do not contain any common allergens, parabens, silicones or sulfates
What's Inside
They both contain fragrances
We independently verify ingredients, and our claims are backed by peer-reviewed research. Spot a product that needs an update? Let us know.
Ingredient Info
COSRX The 6 Peptide Skin Booster Serum 44 ingredients
PCA Skin Exlinea Pro Peptide Serum 36 ingredients
What's inside (and what isn't)
What's inside (and what isn't)
At a glance
Click on any of the items below to learn more
COSRX The 6 Peptide Skin Booster Serum 44 ingredients
PCA Skin Exlinea Pro Peptide Serum 36 ingredients
Key Ingredients
Benefits
Concerns
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningDipropylene Glycol
MaskingGlycerin
Humectant
Pentylene Glycol
Skin Conditioning1,2-Hexanediol
Skin Conditioning
Niacinamide
Smoothing
Acetyl Hexapeptide-8
Humectant
Copper Tripeptide-1
Skin Conditioning
Sh-Polypeptide-121
Skin Conditioning
Dipeptide Diaminobutyroyl Benzylamide Diacetate
Skin Conditioning
Oligopeptide-68
Bleaching
Palmitoyl Tripeptide-8
Skin Conditioning
Allantoin
Skin Conditioning
Sodium Hyaluronate
Humectant
Acetyl Glucosamine
Skin ConditioningSerine
Masking
Alanine
MaskingGlycine
Buffering
Threonine
Arginine
Masking
Proline
Skin ConditioningBetaine
Humectant
Sodium PCA
Humectant
Sodium Lactate
BufferingPCA
Humectant
Glutamic Acid
Humectant
Lysine Hcl
Skin Conditioning
Tocopherol
Antioxidant
Dextran
Glycine Soja Oil
Emollient
Hydrogenated Lecithin
Emulsifying
Ammonium Acryloyldimethyltaurate/Vp Copolymer
Polyacrylate Crosspolymer-6
Emulsion StabilisingButylene Glycol
Humectant
Xanthan Gum
EmulsifyingEthylhexylglycerin
Skin ConditioningAdenosine
Skin Conditioning
Polyquaternium-51
Skin Conditioning
Disodium EDTA
Citric Acid
Buffering
Caprylyl Glycol
EmollientT-Butyl Alcohol
Perfuming
Potassium Sorbate
Preservative
Sodium Oleate
CleansingWater, Dipropylene Glycol, Glycerin, Pentylene Glycol, 1,2-Hexanediol, Niacinamide, Acetyl Hexapeptide-8, Copper Tripeptide-1, Sh-Polypeptide-121, Dipeptide Diaminobutyroyl Benzylamide Diacetate, Oligopeptide-68, Palmitoyl Tripeptide-8, Allantoin, Sodium Hyaluronate, Acetyl Glucosamine, Serine, Alanine, Glycine, Threonine, Arginine, Proline, Betaine, Sodium PCA, Sodium Lactate, PCA, Glutamic Acid, Lysine Hcl, Tocopherol, Dextran, Glycine Soja Oil, Hydrogenated Lecithin, Ammonium Acryloyldimethyltaurate/Vp Copolymer, Polyacrylate Crosspolymer-6, Butylene Glycol, Xanthan Gum, Ethylhexylglycerin, Adenosine, Polyquaternium-51, Disodium EDTA, Citric Acid, Caprylyl Glycol, T-Butyl Alcohol, Potassium Sorbate, Sodium Oleate
Water
Skin ConditioningGlycerin
Humectant
Pentylene Glycol
Skin ConditioningGlyceryl Isostearate
Emollient
Isostearyl Isostearate
Emollient
C13-15 Alkane
SolventBetaine
Humectant
Acrylates/C10-30 Alkyl Acrylate Crosspolymer
Emulsion StabilisingXanthan Gum
EmulsifyingMethyl Gluceth-20
Humectant
Oryza Sativa Starch
AbsorbentPolyglyceryl-3 Laurate
EmulsifyingSodium Levulinate
Skin ConditioningCaprylyl Glycol
EmollientLevulinic Acid
Perfuming
Polyglyceryl-6 Oleate
Emulsifying
Hydrolyzed Wheat Protein
Skin ConditioningEthylhexylglycerin
Skin ConditioningHydrolyzed Soy Protein
Humectant
Sodium Hydroxide
BufferingTetrasodium Glutamate Diacetate
Butylene Glycol
Humectant
Pectin
Emulsion StabilisingHydroxyethylcellulose
Emulsion StabilisingArginine
Masking
Proline
Skin ConditioningSerine
Masking
Glucose
Humectant
Acetyl Octapeptide-3
Humectant
Bacillus/Soybean Ferment Extract
Skin ConditioningSodium Hyaluronate
Humectant
Chondrus Crispus Extract
Skin Conditioning
Acetyl Hexapeptide-8
Humectant
Disodium Phosphate
BufferingPolysorbate 60
Emulsifying
Sodium Phosphate
BufferingWater, Glycerin, Pentylene Glycol, Glyceryl Isostearate, Isostearyl Isostearate, C13-15 Alkane, Betaine, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Xanthan Gum, Methyl Gluceth-20, Oryza Sativa Starch, Polyglyceryl-3 Laurate, Sodium Levulinate, Caprylyl Glycol, Levulinic Acid, Polyglyceryl-6 Oleate, Hydrolyzed Wheat Protein, Ethylhexylglycerin, Hydrolyzed Soy Protein, Sodium Hydroxide, Tetrasodium Glutamate Diacetate, Butylene Glycol, Pectin, Hydroxyethylcellulose, Arginine, Proline, Serine, Glucose, Acetyl Octapeptide-3, Bacillus/Soybean Ferment Extract, Sodium Hyaluronate, Chondrus Crispus Extract, Acetyl Hexapeptide-8, Disodium Phosphate, Polysorbate 60, Sodium Phosphate
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Acetyl Hexapeptide-8, commonly known as Argireline, is a popular peptide in skincare. It’s often referred to as a “Botox-like” ingredient because it helps reduce muscle movement.
By relaxing these micro-movements, Argireline may help minimize the appearance of fine lines and wrinkles. That said, it’s not as powerful as Botox, and research on its long-term effectiveness is still limited.
Beyond smoothing, Argireline may also support collagen production. Collagen is the protein that helps keep your skin firm, bouncy, and well-hydrated by strengthening the skin barrier.
So while Argireline isn’t a miracle fix, it can be a helpful addition to a routine focused on both prevention and skin health.
Read more about other common types of peptides here:
Learn more about Acetyl Hexapeptide-8Arginine is an amino acid that is important for human development. Your body uses is it to produce hair keratin and skin collagen.
As a cosmetic ingredient, Arginine has antioxidant properties and can also help repair damaged skin. This ingredient is derived either synthetically or from animals.
Arginine isn't fungal acne safe when used in the presence of other lipids (fats, fatty acids, oils, esters, etc). Oils and fats occur naturally within the skin, so take caution when using Arginine if you're prone to fungal acne.
Learn more about ArginineBetaine is a common humectant (a substance that promotes retention of moisture). It's known to be gentle on the skin and can help balance hydration.
This ingredient is best for improving hydration and soothing irritated skin. Studies also show it helps even out skin tone.
Fun fact: Betaine is naturally created in the skin and body. The kind found within cosmetic products can be either plant-derived or synthetic.
Learn more about BetaineButylene Glycol (or BG) is used within cosmetic products for a few different reasons:
Overall, Butylene Glycol is a safe and well-rounded ingredient that works well with other ingredients.
Though this ingredient works well with most skin types, some people with sensitive skin may experience a reaction such as allergic rashes, closed comedones, or itchiness.
Learn more about Butylene GlycolCaprylyl Glycol is a humectant and emollient, meaning it attracts and preserves moisture.
It is a common ingredient in many products, especially those designed to hydrate skin. The primary benefits are retaining moisture, skin softening, and promoting a healthy skin barrier.
Though Caprylyl Glycol is an alcohol derived from fatty acids, it is not the kind that can dry out skin.
This ingredient is also used as a preservative to extend the life of products. It has slight antimicrobial properties.
Learn more about Caprylyl GlycolEthylhexylglycerin (we can't pronounce this either) is commonly used as a preservative and skin softener. It is derived from glyceryl.
You might see Ethylhexylglycerin often paired with other preservatives such as phenoxyethanol. Ethylhexylglycerin has been found to increase the effectiveness of these other preservatives.
Glycerin is already naturally found in your skin. It helps moisturize and protect your skin.
A study from 2016 found glycerin to be more effective as a humectant than AHAs and hyaluronic acid.
As a humectant, it helps the skin stay hydrated by pulling moisture to your skin. The low molecular weight of glycerin allows it to pull moisture into the deeper layers of your skin.
Hydrated skin improves your skin barrier; Your skin barrier helps protect against irritants and bacteria.
Glycerin has also been found to have antimicrobial and antiviral properties. Due to these properties, glycerin is often used in wound and burn treatments.
In cosmetics, glycerin is usually derived from plants such as soybean or palm. However, it can also be sourced from animals, such as tallow or animal fat.
This ingredient is organic, colorless, odorless, and non-toxic.
Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.
Learn more about GlycerinPentylene glycol is typically used within a product to thicken it. It also adds a smooth, soft, and moisturizing feel to the product. It is naturally found in plants such as sugar beets.
The hydrophilic trait of Pentylene Glycol makes it a humectant. As a humectant, Pentylene Glycol helps draw moisture from the air to your skin. This can help keep your skin hydrated.
This property also makes Pentylene Glycol a great texture enhancer. It can also help thicken or stabilize a product.
Pentylene Glycol also acts as a mild preservative and helps to keep a product microbe-free.
Some people may experience mild eye and skin irritation from Pentylene Glycol. We always recommend speaking with a professional about using this ingredient in your routine.
Pentylene Glycol has a low molecular weight and is part of the 1,2-glycol family.
Learn more about Pentylene GlycolProline is an amino-acid. It helps moisturize the skin and plays an important role in creating proteins.
Our skin uses proline as one of the building blocks for producing collagen.
In medicine, proline is used as an osmoprotectant. This means it helps prevent oxidative degradation in other drugs.
Our bodies are able to produce proline naturally, but certain conditions may inhibit this production. In that case, proline can be obtained from eating egg whites, soy protein, dairy products, asparagus, mushrooms, and seaweed.
Learn more about ProlineSerine is an amino acid naturally found in our body. Our bodies use amino acids to create protein.
Amino-acids help give keep our skin hydrated. They play an important role in the skin barrier, which keeps the skin plump and firm.
Serine is a non-essential amino acid, meaning we don't need to obtain it from eating foods.
Learn more about SerineSodium Hyaluronate is hyaluronic acid's salt form. It is commonly derived from the sodium salt of hyaluronic acid.
Like hyaluronic acid, it is great at holding water and acts as a humectant. This makes it a great skin hydrating ingredient.
Sodium Hyaluronate is naturally occurring in our bodies and is mostly found in eye fluid and joints.
These are some other common types of Hyaluronic Acid:
Learn more about Sodium HyaluronateWater. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.
So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.
You'll also recognize water as that liquid we all need to stay alive. If you see this, drink a glass of water. Stay hydrated!
Learn more about WaterXanthan gum is used as a stabilizer and thickener within cosmetic products. It helps give products a sticky, thick feeling - preventing them from being too runny.
On the technical side of things, xanthan gum is a polysaccharide - a combination consisting of multiple sugar molecules bonded together.
Xanthan gum is a pretty common and great ingredient. It is a natural, non-toxic, non-irritating ingredient that is also commonly used in food products.
Learn more about Xanthan GumIngredient Ratings
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COSRX The 6 Peptide Skin Booster Serum 44 ingredients
PCA Skin Exlinea Pro Peptide Serum 36 ingredients
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