Kérastase Première Decalcifying System Reparative Pre-Shampoo Treatment Versus L'Oréal Professionnel Metal Detox Pre-Shampoo Treatment
Updated on May 13, 2025
Overview
What they are
These products are both reef safe other hair cleansers. They have a total of 9 ingredients in common
Cool Features
They both contain AHA
Suited For
They're both likely to be good for brightening skin, oily skin, reducing pores, scar healing and better texture
Free From
They both do not contain any harsh alcohols, parabens, silicones or sulfates
What's Inside
They both contain common allergens, fragrances and oils
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
Kérastase Première Decalcifying System Reparative Pre-Shampoo Treatment 21 ingredients
L'Oréal Professionnel Metal Detox Pre-Shampoo Treatment 21 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
Kérastase Première Decalcifying System Reparative Pre-Shampoo Treatment 21 ingredients
L'Oréal Professionnel Metal Detox Pre-Shampoo Treatment 21 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
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
Water
Skin ConditioningLaureth-5 Carboxylic Acid
CleansingAminopropyl Triethoxysilane
Cocamidopropyl Betaine
Cleansing
Sodium Chloride
Masking
PEG-150 Distearate
Emulsifying
Phenoxyethanol
Preservative
PEG-40 Hydrogenated Castor Oil
Emulsifying
Polyquaternium-67
Lactic Acid
Buffering
Laureth-4
Emulsifying
Sodium Hydroxide
BufferingCaprylyl Glycol
EmollientLimonene
Perfuming
Hexyl Cinnamal
Perfuming
Linalool
Perfuming
Citral
Perfuming
Geraniol
Perfuming
Polyquaternium-7
Sodium Benzoate
Masking
Parfum
Masking
Water, Laureth-5 Carboxylic Acid, Aminopropyl Triethoxysilane, Cocamidopropyl Betaine, Sodium Chloride, PEG-150 Distearate, Phenoxyethanol, PEG-40 Hydrogenated Castor Oil, Polyquaternium-67, Lactic Acid, Laureth-4, Sodium Hydroxide, Caprylyl Glycol, Limonene, Hexyl Cinnamal, Linalool, Citral, Geraniol, Polyquaternium-7, Sodium Benzoate, Parfum
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Citral 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 CitralLimonene 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 LimoneneLinalool 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 LinaloolParfum 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 ParfumPeg-40 Hydrogenated Castor Oil is derived from castor oil and polyethylene glycol (PEG). It is used as a emollient and emulsifier.
As an emulsifier, it helps prevent ingredients from separating. It also helps make the other ingredients more soluble; it is often used to solubilize fragrances. This increases spreadability and elongates shelf life in a product.
Emollients help soothe and soften the skin. They do this by creating a protective film on your skin. This barrier helps trap moisture and keeps your skin hydrated. Emollients may be effective at treating dry or itchy skin.
This ingredient may or may not be vegan, depending on the source.
Peg-40 Hydrogenated Castor Oil may not be fungal-acne safe. We recommend speaking with a professional if you have any questions or concerns.
Learn more about PEG-40 Hydrogenated Castor OilPhenoxyethanol 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.
Sodium 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 BenzoateSodium 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 HydroxideWater. 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
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