L'Oréal Professionnel Metal Detox Leave-In Repair Styling Cream Versus K18 Hair Leave-In Molecular Repair Hair Mask
Updated on April 18, 2025
Overview
Cool Features
They both contain Vitamin E
Suited For
They're both likely to be good for anti aging, dry skin and scar healing
Free From
They both do not contain any 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 Leave-In Repair Styling Cream 26 ingredients
K18 Hair Leave-In Molecular Repair Hair Mask 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 Leave-In Repair Styling Cream 26 ingredients
K18 Hair Leave-In Molecular Repair Hair Mask 21 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningButylene Glycol
Humectant
Aminopropyl Dimethicone
Isododecane
EmollientIsononyl Isononanoate
EmollientGlycine
Buffering
PEG-240/Hdi Copolymer Bis-Decyltetradeceth-20 Ether
StabilisingUndecane
EmollientCaprylyl Glycol
EmollientSclerotium Gum
Emulsion StabilisingTridecane
Perfuming
Tocopherol
Antioxidant
Ethylhexyl Salicylate
UV Absorber
Limonene
Perfuming
Sodium Citrate
BufferingCitric Acid
Buffering
Hexyl Cinnamal
Perfuming
Linalool
Perfuming
Citral
Perfuming
Geraniol
Perfuming
Coumarin
Perfuming
Potassium Laurate
EmulsifyingPolyquaternium-7
Sodium Benzoate
Masking
Helianthus Annuus Seed Oil
Emollient
Parfum
Masking
Water, Butylene Glycol, Aminopropyl Dimethicone, Isododecane, Isononyl Isononanoate, Glycine, PEG-240/Hdi Copolymer Bis-Decyltetradeceth-20 Ether, Undecane, Caprylyl Glycol, Sclerotium Gum, Tridecane, Tocopherol, Ethylhexyl Salicylate, Limonene, Sodium Citrate, Citric Acid, Hexyl Cinnamal, Linalool, Citral, Geraniol, Coumarin, Potassium Laurate, Polyquaternium-7, Sodium Benzoate, Helianthus Annuus Seed Oil, Parfum
Water
Skin ConditioningAlcohol Denat.
Antimicrobial
Propylene Glycol
Humectant
Cetearyl Alcohol
Emollient
Dicaprylyl Ether
EmollientCetyl Esters
Emollient
Behentrimonium Chloride
Preservative
Polysorbate 20
Emulsifying
Sh-Oligopeptide-78
Hydrolyzed Wheat Protein
Skin ConditioningHydrolyzed Wheat Starch
Skin ConditioningIsopropyl Alcohol
Solvent
Tocopherol
Antioxidant
Phenoxyethanol
Preservative
Potassium Sorbate
Preservative
Citric Acid
Buffering
Parfum
Masking
Geraniol
Perfuming
Linalool
Perfuming
Hexyl Cinnamal
Perfuming
Benzyl Alcohol
Perfuming
Water, Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20, Sh-Oligopeptide-78, Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Parfum, Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Water. 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 WaterTocopherol (also known as Vitamin E) is a common antioxidant used to help protect the skin from free-radicals and strengthen the skin barrier. It's also fat soluble - this means our skin is great at absorbing it.
Vitamin E also helps keep your natural skin lipids healthy. Your lipid skin barrier naturally consists of lipids, ceramides, and fatty acids. Vitamin E offers extra protection for your skin’s lipid barrier, keeping your skin healthy and nourished.
Another benefit is a bit of UV protection. Vitamin E helps reduce the damage caused by UVB rays. (It should not replace your sunscreen). Combining it with Vitamin C can decrease sunburned cells and hyperpigmentation after UV exposure.
You might have noticed Vitamin E + C often paired together. This is because it is great at stabilizing Vitamin C. Using the two together helps increase the effectiveness of both ingredients.
There are often claims that Vitamin E can reduce/prevent scarring, but these claims haven't been confirmed by scientific research.
Learn more about TocopherolCitric 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 AcidHexyl Cinnamal is a fragrance ingredient with a similar scent to jasmine. It can be naturally found in chamomile essential oil.
This ingredient is a known EU allergen and may sensitize the skin. The EU requires this ingredient to be listed separately on an ingredients list.
Hexyl Cinnamal is not water soluble but is soluble in oils.
Learn more about Hexyl CinnamalLinalool 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 LinaloolGeraniol is used to add fragrance/parfum to a product. It is the main component of citronellol. It is a monoterpenoid and an alcohol.
Monoterpenes are naturally found in many parts of different plants.
Geraniol can be found in many essential oils including Rose Oil and Citronella Oil. The scent of Geraniol is often described as "rose-like". Many foods also contain Geraniol for fruit flavoring.
Geraniol can irritate the skin when exposed to air. However, irritation depends on the ability of geraniol to penetrate into the skin. In general, geraniol is not able to penetrate skin easily.
Geraniol is colorless and has low water-solubility. However, it is soluble in common organic solvents.
Like citronellol, it is a natural insect repellent.
2,6-Octadien-1-ol, 3,7-dimethyl-, (2E)-
Learn more about GeraniolParfum 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 ParfumIngredient Ratings
Here's what our community thinks of the ingredients in these products.
When to use
L'Oréal Professionnel Metal Detox Leave-In Repair Styling Cream 26 ingredients
K18 Hair Leave-In Molecular Repair Hair Mask 21 ingredients
Reviews
Here's what our community thinks
L'Oréal Professionnel Metal Detox Leave-In Repair Styling Cream 26 ingredients
K18 Hair Leave-In Molecular Repair Hair Mask 21 ingredients
Repaired my extremely bleach damaged hair as well as both of their shampoos.
This saved my badly damaged bleached hair.
