L'Oréal Professionnel Pro Longer Lengths Renewing Mask Versus Kérastase Densifique Fondant Densité Conditioner
Updated on April 18, 2025
Overview
Suited For
They're both likely to be good for dry skin, brightening skin, oily skin, reducing pores and scar healing
Free From
They both do not contain any oils
What's Inside
They both contain common allergens, fragrances, parabens and silicones
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 Pro Longer Lengths Renewing Mask 29 ingredients
Kérastase Densifique Fondant Densité Conditioner 30 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
L'Oréal Professionnel Pro Longer Lengths Renewing Mask 29 ingredients
Kérastase Densifique Fondant Densité Conditioner 30 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningHydroxypropyl Starch Phosphate
Quaternium-87
CleansingStearyl Alcohol
Emollient
Behentrimonium Chloride
Preservative
Propylene Glycol
Humectant
Amodimethicone
Phenoxyethanol
Preservative
Isopropyl Alcohol
Solvent
Candelilla Cera
Emollient
Methylparaben
Preservative
Trideceth-5
EmulsifyingGlycerin
Humectant
Arginine
Masking
Panthenol
Skin Conditioning
Trideceth-10
CleansingLactic Acid
Buffering
Benzyl Salicylate
Perfuming
Chlorhexidine Dihydrochloride
Antimicrobial
Benzyl Alcohol
Perfuming
Linalool
Perfuming
Limonene
Perfuming
2-Oleamido-1,3-Octadecanediol
Skin ConditioningAminopropyl Triethoxysilane
Hydroxycitronellal
Perfuming
Citronellol
Perfuming
Acetic Acid
BufferingPolyquaternium-6
Parfum
Masking
Water, Hydroxypropyl Starch Phosphate, Quaternium-87, Stearyl Alcohol, Behentrimonium Chloride, Propylene Glycol, Amodimethicone, Phenoxyethanol, Isopropyl Alcohol, Candelilla Cera, Methylparaben, Trideceth-5, Glycerin, Arginine, Panthenol, Trideceth-10, Lactic Acid, Benzyl Salicylate, Chlorhexidine Dihydrochloride, Benzyl Alcohol, Linalool, Limonene, 2-Oleamido-1,3-Octadecanediol, Aminopropyl Triethoxysilane, Hydroxycitronellal, Citronellol, Acetic Acid, Polyquaternium-6, Parfum
Water
Skin ConditioningSodium Laureth Sulfate
Cleansing
Coco-Glucoside
CleansingGlycerin
Humectant
Distearyl Ether
Skin ConditioningSodium Chloride
Masking
Behenyl Alcohol
Emollient
Cocamide Mipa
EmulsifyingLaureth-2
CleansingPPG-5-Ceteth-20
EmulsifyingSodium Benzoate
Masking
Polysilicone-8
Carbomer
Emulsion StabilisingArachidyl Alcohol
EmollientSodium Methylparaben
Preservative
Salicylic Acid
Masking
Taurine
BufferingStearyl Alcohol
Emollient
Aminomethyl Propanol
BufferingPolyquaternium-16
Hexyl Cinnamal
Perfuming
Limonene
Perfuming
Linalool
Perfuming
2-Oleamido-1,3-Octadecanediol
Skin ConditioningHydroxycitronellal
Perfuming
Citronellol
Perfuming
Biotin
AntiseborrhoeicSodium Hydroxide
BufferingCitric Acid
Buffering
Parfum
Masking
Water, Sodium Laureth Sulfate, Coco-Glucoside, Glycerin, Distearyl Ether, Sodium Chloride, Behenyl Alcohol, Cocamide Mipa, Laureth-2, PPG-5-Ceteth-20, Sodium Benzoate, Polysilicone-8, Carbomer, Arachidyl Alcohol, Sodium Methylparaben, Salicylic Acid, Taurine, Stearyl Alcohol, Aminomethyl Propanol, Polyquaternium-16, Hexyl Cinnamal, Limonene, Linalool, 2-Oleamido-1,3-Octadecanediol, Hydroxycitronellal, Citronellol, Biotin, Sodium Hydroxide, Citric Acid, Parfum
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
We don't have a description for 2-Oleamido-1,3-Octadecanediol yet.
Citronellol is used to add fragrance/parfum to a product. It is often derived from plants such as roses. In fact, it can be found in many essential oils including geranium, lavender, neroli, and more. The scent of Citronellol is often described as "fresh, grassy, and citrus-like".
Since the Citronellol molecule is already unstable, Citronellol becomes irritating on the skin when exposed to air.
Citronellol is a modified terpene. Terpenes are unsaturated hydrocarbons found in plants. They make up the primary part of essential oils.
Citronellol is not able to be absorbed into deeper layers of the skin. It has low permeability,
Citronellol is also a natural insect repellent.
Learn more about CitronellolGlycerin 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 GlycerinHydroxycitronellal is a fragrance created from citronellal. The smell of hydroxycitronellal is often described as "citrus-like" or "melon-like".
Hydroxycitronellal is a known EU allergen and may cause irritation when applied to the skin.
Limonene 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 ParfumStearyl Alcohol is a type of fatty alcohol from stearic acid. It is a white, waxy compound used to emulsify ingredients.
Fatty Alcohols are most often used as an emollient or to thicken a product. Emollients help soothe and hydrate the skin by trapping moisture.
They are usually derived from natural fats and oils and therefore do not have the same drying or irritating effect as solvent alcohols. FDA allows products labeled "alcohol-free" to have fatty alcohols.
Learn more about Stearyl AlcoholWater. 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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