L'Oréal Professionnel Metal Detox Sulfate-Free Shampoo Versus Kérastase Première Decalcifying System Reparative Pre-Shampoo Treatment
Updated on April 18, 2025
Overview
What they are
These products are both reef safe . They have a total of 12 ingredients in common
Cool Features
They both contain AHA
Suited For
They're both likely to be good for dry skin, brightening skin, oily skin, reducing pores, scar healing and better texture
Free From
They both do not contain any harsh alcohols, parabens or sulfates
What's Inside
They both contain common allergens and 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
L'Oréal Professionnel Metal Detox Sulfate-Free Shampoo 37 ingredients
Kérastase Première Decalcifying System Reparative Pre-Shampoo Treatment 21 ingredients
About this product
About this product
At a glance
Click on any of the items below to learn more
L'Oréal Professionnel Metal Detox Sulfate-Free Shampoo 37 ingredients
Kérastase Première Decalcifying System Reparative Pre-Shampoo Treatment 21 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Sodium Cocoyl Isethionate
CleansingDisodium Laureth Sulfosuccinate
CleansingGlycol Distearate
Emollient
Sodium Lauryl Sulfoacetate
CleansingSodium Lauroyl Sarcosinate
CleansingGlycerin
Humectant
Parfum
Masking
PPG-5-Ceteth-20
EmulsifyingDecyl Glucoside
CleansingCocamidopropyl Betaine
Cleansing
Coco-Betaine
CleansingDivinyldimethicone/Dimethicone Copolymer
Amodimethicone
Citric Acid
Buffering
Sodium Hydroxide
BufferingPolyquaternium-7
Polyquaternium-10
Carbomer
Emulsion StabilisingSodium Benzoate
Masking
Sodium Chloride
Masking
Limonene
Perfuming
PEG-55 Propylene Glycol Oleate
Propylene Glycol
Humectant
Salicylic Acid
Masking
Benzoic Acid
Masking
Polysorbate 21
Emulsifying
Hexyl Cinnamal
Perfuming
Linalool
Perfuming
Trideceth-6
EmulsifyingC12-13 Pareth-23
CleansingC12-13 Pareth-3
EmulsifyingCitral
Perfuming
Geraniol
Perfuming
Glycine
Buffering
Tocopherol
Antioxidant
Cetrimonium Chloride
Antimicrobial
Phenoxyethanol
Preservative
Sodium Cocoyl Isethionate, Disodium Laureth Sulfosuccinate, Glycol Distearate, Sodium Lauryl Sulfoacetate, Sodium Lauroyl Sarcosinate, Glycerin, Parfum, PPG-5-Ceteth-20, Decyl Glucoside, Cocamidopropyl Betaine, Coco-Betaine, Divinyldimethicone/Dimethicone Copolymer, Amodimethicone, Citric Acid, Sodium Hydroxide, Polyquaternium-7, Polyquaternium-10, Carbomer, Sodium Benzoate, Sodium Chloride, Limonene, PEG-55 Propylene Glycol Oleate, Propylene Glycol, Salicylic Acid, Benzoic Acid, Polysorbate 21, Hexyl Cinnamal, Linalool, Trideceth-6, C12-13 Pareth-23, C12-13 Pareth-3, Citral, Geraniol, Glycine, Tocopherol, Cetrimonium Chloride, Phenoxyethanol
Water
Skin ConditioningGlycerin
Humectant
Propylene Glycol
Humectant
Glycine
Buffering
Citric Acid
Buffering
Sodium Hydroxide
BufferingParfum
Masking
Cetrimonium Chloride
Antimicrobial
PEG-40 Hydrogenated Castor Oil
Emulsifying
Polysorbate 20
Emulsifying
Polysorbate 80
Emulsifying
Phenoxyethanol
Preservative
Hydrolyzed Vegetable Protein Pg-Propyl Silanetriol
Skin ConditioningQuaternium-80
Limonene
Perfuming
Hydroxypropyl Guar
Emulsion StabilisingHydroxypropyl Guar Hydroxypropyltrimonium Chloride
Linalool
Perfuming
Sodium Benzoate
Masking
Citral
Perfuming
Potassium Sorbate
Preservative
Water, Glycerin, Propylene Glycol, Glycine, Citric Acid, Sodium Hydroxide, Parfum, Cetrimonium Chloride, PEG-40 Hydrogenated Castor Oil, Polysorbate 20, Polysorbate 80, Phenoxyethanol, Hydrolyzed Vegetable Protein Pg-Propyl Silanetriol, Quaternium-80, Limonene, Hydroxypropyl Guar, Hydroxypropyl Guar Hydroxypropyltrimonium Chloride, Linalool, Sodium Benzoate, Citral, Potassium Sorbate
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
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 GlycerinParfum is a catch-all term for an ingredient or more that is used to give a scent to products.
Also called "fragrance", this ingredient can be a blend of hundreds of chemicals or plant oils. This means every product with "fragrance" or "parfum" in the ingredients list is a different mixture.
For instance, Habanolide is a proprietary trade name for a specific aroma chemical. When used as a fragrance ingredient in cosmetics, most aroma chemicals fall under the broad labeling category of “FRAGRANCE” or “PARFUM” according to EU and US regulations.
The term 'parfum' or 'fragrance' is not regulated in many countries. In many cases, it is up to the brand to define this term.
For instance, many brands choose to label themselves as "fragrance-free" because they are not using synthetic fragrances. However, their products may still contain ingredients such as essential oils that are considered a fragrance by INCI standards.
One example is Calendula flower extract. Calendula is an essential oil that still imparts a scent or 'fragrance'.
Depending on the blend, the ingredients in the mixture can cause allergies and sensitivities on the skin. Some ingredients that are known EU allergens include linalool and citronellol.
Parfum can also be used to mask or cover an unpleasant scent.
The bottom line is: not all fragrances/parfum/ingredients are created equally. If you are worried about fragrances, we recommend taking a closer look at an ingredient. And of course, we always recommend speaking with a professional.
Learn more about ParfumCitric Acid is an AHA derived from citrus fruits (think oranges, lemons, and limes!).
As an AHA, Citric Acid removes the top layer of skin cells from the newer layer of skin underneath. This helps skin to remove dark spots and even out skin tone.
If you spot Citric Acid near the end of an ingredient list, it's likely there as a pH adjuster rather than an active ingredient.
Read more about some other popular AHA's here:
Learn more about Citric AcidSodium Hydroxide is also known as lye or caustic soda. It is used to adjust the pH of products; many ingredients require a specific pH to be effective.
In small amounts, sodium hydroxide is considered safe to use. However, large amounts may cause chemical burns due to its high alkaline.
Your skin has a natural pH and acid mantle. This acid mantle helps prevent harmful bacteria from breaking through. The acid mantle also helps keep your skin hydrated.
"Alkaline" refers to a high pH level. A low pH level would be considered acidic.
Learn more about Sodium HydroxideSodium Benzoate is a preservative. It's used in both cosmetic and food products to inhibit the growth of mold and bacteria. It is typically produced synthetically.
Both the US FDA and EU Health Committee have approved the use of sodium benzoate. In the US, levels of 0.1% (of the total product) are allowed.
Sodium benzoate works as a preservative by inhibiting the growth of bacteria inside of cells. It prevents the cell from fermenting a type of sugar using an enzyme called phosphofructokinase.
It is the salt of benzoic acid. Foods containing sodium benzoate include soda, salad dressings, condiments, fruit juices, wines, and snack foods.
Studies for using ascorbic acid and sodium benzoate in cosmetics are lacking, especially in skincare routines with multiple steps.
We always recommend speaking with a professional, such as a dermatologist, if you have any concerns.
Learn more about Sodium BenzoateLimonene is a fragrance that adds scent and taste to a formulation.
It's found in the peel oil of citrus fruits and other plants such as lavender and eucalyptus. The scent of limonene is generally described as "sweet citrus".
Limonene acts as an antioxidant, meaning it helps neutralize free radicals.
When exposed to air, oxidized limonene may sensitize the skin. Because of this, limonene is often avoided by people with sensitive skin.
The term 'fragrance' is not regulated in many countries. In many cases, it is up to the brand to define this term. For instance, many brands choose to label themselves as "fragrance-free" because they are not using synthetic fragrances. However, their products may still contain ingredients such as essential oils that are considered a fragrance.
Learn more about LimonenePropylene Glycol is an odorless, colorless liquid. As a humectant, it helps skin retain moisture. It also aids in delivering active ingredients.
Another role of this ingredient is preventing a product from melting or freezing. Propylene glycol also adds antimicrobrial properties to a product, elongating product lifespan.
This ingredient is considered an organic alcohol and commonly added into both cosmetics and foods.
Those with sensitive skin or conditions may develop a rash when using this ingredient.
Learn more about Propylene GlycolLinalool is a fragrance and helps add scent to products. It's derived from common plants such as cinnamon, mint, citrus, and lavender.
Like Limonene, this ingredient oxidizes when exposed to air. Oxidized linalool can cause allergies and skin sensitivity.
This ingredient has a scent that is floral, spicy tropical, and citrus-like.
Learn more about LinaloolCitral is a fragrance and used to add a lemon-like scent to products. It is both naturally found in plants and created synthetically. In plants, it is commonly occurring in lemon myrtle, lemongrass, lemon tea-tree, lemon verbena, and other citruses.
The EU mandates Citral be listed separately as a fragrance. It is a known allergen and may cause contact dermatitis. Citral can also used as a masking ingredient.
The term 'fragrance' is not regulated in many countries. In many cases, it is up to the brand to define this term. For instance, many brands choose to label themselves as "fragrance-free" because they are not using synthetic fragrances. However, their products may still contain ingredients such as essential oils that are considered a fragrance.
The term 'citral' is a collective term for two geometric isomers: geranial/Citral A and neral/Citral B.
Learn more about CitralThis ingredient is an amino acid that helps build proteins and moisturizes skin. It is already present in our skin as our bodies produce them naturally.
Glycine already plays a role in helping keep our skin moisturized as amino acids transport moisture throughout our skin.
As collagen is made up of glycine and other amino acids, it is believed glycine may help our skin produce more collagen.
Learn more about GlycineThis ingredient is a preservative, antimicrobial, and emulsifier. It is often used in cosmetics for its ability to cleanse, condition, and reduce static.
Cetrimonium chloride is a quaternary ammonium salt, meaning it has a water-soluble structure.
Phenoxyethanol is a preservative that has germicide, antimicrobial, and aromatic properties. Studies show that phenoxyethanol can prevent microbial growth. By itself, it has a scent that is similar to that of a rose.
It's often used in formulations along with Caprylyl Glycol to preserve the shelf life of products.
Ingredient Ratings
Here's what our community thinks of the ingredients in these products.
When to use
L'Oréal Professionnel Metal Detox Sulfate-Free Shampoo 37 ingredients
Kérastase Première Decalcifying System Reparative Pre-Shampoo Treatment 21 ingredients
Reviews
Here's what our community thinks
L'Oréal Professionnel Metal Detox Sulfate-Free Shampoo 37 ingredients
This literally fixed my hair. It was so damaged and dry and I used a sample of this and the hair mask from this line and it literally made my curls so shiny and defined and completely removed all the dryness.
