The INKEY List Polyglutamic Acid Hydrating Serum Versus COLLISTAR Milano Hyaluronic + Polyglutamic Acid
Updated on January 30, 2025
Overview
What they are
These products are both cruelty-free and reef safe serums. They have a total of 4 ingredients in common
Suited For
They're both likely to be good for dry skin, brightening skin and scar healing
Free From
They both do not contain any harsh alcohols, common allergens, oils, parabens or sulfates
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
The INKEY List Polyglutamic Acid Hydrating Serum 25 ingredients
COLLISTAR Milano Hyaluronic + Polyglutamic Acid 16 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
The INKEY List Polyglutamic Acid Hydrating Serum 25 ingredients
COLLISTAR Milano Hyaluronic + Polyglutamic Acid 16 ingredients
Benefits
Concerns
Benefits
Ingredients Side-by-side
Water
Skin ConditioningDimethicone
Emollient
Butylene Glycol
Humectant
Bis-PEG-12 Dimethicone
Emollient
Glycerin
Humectant
Polymethylsilsesquioxane
Polysilicone-11
Phenoxyethanol
Preservative
Polyglutamic Acid
Skin Conditioning
Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Emulsion StabilisingIsohexadecane
EmollientPropanediol
Solvent
Coco-Glucoside
CleansingSodium Benzoate
Masking
Hydroxyethylcellulose
Emulsion StabilisingPolysorbate 80
Emulsifying
Ethylhexylglycerin
Skin ConditioningPotassium Sorbate
Preservative
Decyl Glucoside
CleansingDimethylacrylamide/Acrylic Acid/Polystyrene Ethyl Methacrylate Copolymer
Skin ConditioningSorbitan Oleate
Emulsifying
Trisodium Ethylenediamine Disuccinate
Caprylyl Glycol
EmollientHexylene Glycol
EmulsifyingOryza Sativa Bran Extract
Skin Conditioning
Water, Dimethicone, Butylene Glycol, Bis-PEG-12 Dimethicone, Glycerin, Polymethylsilsesquioxane, Polysilicone-11, Phenoxyethanol, Polyglutamic Acid, Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Isohexadecane, Propanediol, Coco-Glucoside, Sodium Benzoate, Hydroxyethylcellulose, Polysorbate 80, Ethylhexylglycerin, Potassium Sorbate, Decyl Glucoside, Dimethylacrylamide/Acrylic Acid/Polystyrene Ethyl Methacrylate Copolymer, Sorbitan Oleate, Trisodium Ethylenediamine Disuccinate, Caprylyl Glycol, Hexylene Glycol, Oryza Sativa Bran Extract
Water
Skin ConditioningPropanediol
Solvent
Sodium Hyaluronate
Humectant
Levulinic Acid
Perfuming
Glycerin
Humectant
Sodium Levulinate
Skin ConditioningPentylene Glycol
Skin ConditioningSodium Anisate
AntimicrobialSodium Hydroxide
BufferingInulin
Skin ConditioningSodium Polyglutamate
HumectantSodium Acetylated Hyaluronate
Humectant
Alpha-Glucan Oligosaccharide
CleansingSodium Hyaluronate Crosspolymer
Humectant
Hydrolyzed Sodium Hyaluronate
Skin Conditioning
Ethylhexylglycerin
Skin ConditioningWater, Propanediol, Sodium Hyaluronate, Levulinic Acid, Glycerin, Sodium Levulinate, Pentylene Glycol, Sodium Anisate, Sodium Hydroxide, Inulin, Sodium Polyglutamate, Sodium Acetylated Hyaluronate, Alpha-Glucan Oligosaccharide, Sodium Hyaluronate Crosspolymer, Hydrolyzed Sodium Hyaluronate, Ethylhexylglycerin
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Ethylhexylglycerin (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 GlycerinPropanediol is an all-star ingredient. It softens, hydrates, and smooths the skin.
It’s often used to:
Propanediol is not likely to cause sensitivity and considered safe to use. It is derived from corn or petroleum with a clear color and no scent.
Learn more about PropanediolWater. 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 WaterIngredient Ratings
Here's what our community thinks of the ingredients in these products.
When to use
The INKEY List Polyglutamic Acid Hydrating Serum 25 ingredients
COLLISTAR Milano Hyaluronic + Polyglutamic Acid 16 ingredients
Reviews
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