Kérastase Genesis Bain Nutri-Fortifiant Shampoo Versus K18 Hair PEPTIDE PREP™ pH Maintenance Shampoo
Updated on June 19, 2024
Overview
What they are
These products are both reef safe shampoos. They have a total of 8 ingredients in common
Cool Features
They both contain peptides
Suited For
They're both likely to be good for dry skin, brightening skin, sensitive skin and scar healing
Free From
They both do not contain any oils or parabens
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
Kérastase Genesis Bain Nutri-Fortifiant Shampoo 40 ingredients
K18 Hair PEPTIDE PREP™ pH Maintenance Shampoo 18 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 Genesis Bain Nutri-Fortifiant Shampoo 40 ingredients
K18 Hair PEPTIDE PREP™ pH Maintenance Shampoo 18 ingredients
Key Ingredients
Benefits
Concerns
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningSodium Laureth Sulfate
Cleansing
Sodium Chloride
Masking
Cocamidopropyl Betaine
Cleansing
Dimethicone
Emollient
Citric Acid
Buffering
Hexylene Glycol
EmulsifyingSodium Benzoate
Masking
Sodium Hydroxide
BufferingAmodimethicone
Carbomer
Emulsion StabilisingGuar Hydroxypropyltrimonium Chloride
Skin ConditioningTrideceth-10
CleansingGlycerin
Humectant
Salicylic Acid
Masking
Limonene
Perfuming
Glycol Distearate
Emollient
Mica
Cosmetic Colorant
PEG-100 Stearate
Linalool
Perfuming
Steareth-6
EmulsifyingPhenoxyethanol
Preservative
Coco-Betaine
CleansingTrideceth-3
EmulsifyingCI 77891
Cosmetic ColorantBenzyl Salicylate
Perfuming
Coumarin
Perfuming
Zingiber Officinale Root Extract
Masking
Citral
Perfuming
Benzyl Alcohol
Perfuming
Citronellol
Perfuming
Acetic Acid
BufferingFumaric Acid
BufferingXylitylglucoside
Humectant
Anhydroxylitol
Humectant
Leontopodium Alpinum Callus Culture Extract
Antioxidant
Xylitol
Humectant
Xanthan Gum
EmulsifyingDipeptide Diaminobutyroyl Benzylamide Diacetate
Skin Conditioning
Parfum
Masking
Water, Sodium Laureth Sulfate, Sodium Chloride, Cocamidopropyl Betaine, Dimethicone, Citric Acid, Hexylene Glycol, Sodium Benzoate, Sodium Hydroxide, Amodimethicone, Carbomer, Guar Hydroxypropyltrimonium Chloride, Trideceth-10, Glycerin, Salicylic Acid, Limonene, Glycol Distearate, Mica, PEG-100 Stearate, Linalool, Steareth-6, Phenoxyethanol, Coco-Betaine, Trideceth-3, CI 77891, Benzyl Salicylate, Coumarin, Zingiber Officinale Root Extract, Citral, Benzyl Alcohol, Citronellol, Acetic Acid, Fumaric Acid, Xylitylglucoside, Anhydroxylitol, Leontopodium Alpinum Callus Culture Extract, Xylitol, Xanthan Gum, Dipeptide Diaminobutyroyl Benzylamide Diacetate, Parfum
Water
Skin ConditioningSodium C14-16 Olefin Sulfonate
Cleansing
Cocamidopropyl Betaine
Cleansing
Sodium Methyl 2-Sulfolaurate
CleansingSodium Lauryl Sulfoacetate
CleansingSh-Oligopeptide-78
Panthenol
Skin Conditioning
Glycerin
Humectant
Sodium Phytate
Guar Hydroxypropyltrimonium Chloride
Skin ConditioningDisodium 2-Sulfolaurate
CleansingCaprylyl Glycol
EmollientCaprylhydroxamic Acid
Benzoic Acid
Masking
Citric Acid
Buffering
Sodium Hydroxide
BufferingParfum
Masking
Limonene
Perfuming
Water, Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Betaine, Sodium Methyl 2-Sulfolaurate, Sodium Lauryl Sulfoacetate, Sh-Oligopeptide-78, Panthenol, Glycerin, Sodium Phytate, Guar Hydroxypropyltrimonium Chloride, Disodium 2-Sulfolaurate, Caprylyl Glycol, Caprylhydroxamic Acid, Benzoic Acid, Citric Acid, Sodium Hydroxide, Parfum, Limonene
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Citric 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 AcidCocamidopropyl Betaine is a fatty acid created by mixing similar compounds in coconut oil and dimethylaminopropylamine, a compound with two amino groups.
This ingredient is a surfactant and cleanser. It helps gather the dirt, pollutants, and other impurities in your skin to be washed away. It also helps thicken a product and make the texture more creamy.
Being created from coconut oil means Cocamidopropyl Betaine is hydrating for the skin.
While Cocamidopropyl Betaine was believed to be an allergen, a study from 2012 disproved this. It found two compounds in unpure Cocamidopropyl Betaine to be the irritants: aminoamide and 3-dimethylaminopropylamine. High-grade and pure Cocamidopropyl Betaine did not induce allergic reactions during this study.
Learn more about Cocamidopropyl BetaineGlycerin 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 GlycerinThis ingredient is derived from guar gum.
It is a conditioning ingredient, meaning it helps soften skin and hair.
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 LimoneneParfum 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 ParfumSodium 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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When to use
Kérastase Genesis Bain Nutri-Fortifiant Shampoo 40 ingredients
K18 Hair PEPTIDE PREP™ pH Maintenance Shampoo 18 ingredients
Reviews
Here's what our community thinks
