K18 Hair Leave-In Molecular Repair Hair Mask

Versus

K18 Hair Leave-In Molecular Repair Hair Mask Versus The INKEY List Peptide Volumizing Hair Treatment

Updated on October 25, 2023

Overview

What they are

These products are both vegan, cruelty-free, and reef safe . They have a total of 3 ingredients in common

Cool Features

They both contain peptides

Suited For

They're both likely to be good for dry skin and brightening skin

Free From

They both do not contain any parabens, silicones or sulfates

What's Inside

They both contain fragrances

We independently verify ingredients, and our claims are backed by peer-reviewed research. Spot a product that needs an update? Let us know.

New Comparison

K18 Hair Leave-In Molecular Repair Hair Mask

Hair Mask

American Brand United States

The INKEY List Peptide Volumizing Hair Treatment

Hair Serum

British Brand United Kingdom

Ingredient Info

Click any item below to learn more and see relevant ingredients

K18 Hair Leave-In Molecular Repair Hair Mask 21 ingredients

The INKEY List Peptide Volumizing Hair Treatment 20 ingredients

At a glance

Click on any of the items below to learn more

K18 Hair Leave-In Molecular Repair Hair Mask 21 ingredients

The INKEY List Peptide Volumizing Hair Treatment 20 ingredients

Notable Ingredients

Benefits

Concerns

Notable Ingredients

Benefits

Ingredients Side-by-side

found in both products

Leave-In Molecular Repair Hair Mask

Water Skin Conditioning, Solvent

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.

Loved Full details ->

Alcohol Denat. Antimicrobial, Astringent, Masking

Alcohol • 5 Concerns

Alcohol Denat. is an alcohol with a denaturant property. It is created by mixing ethanol and other additives. It has a low molecular weight and will evaporate quickly. This helps other ingredients become better absorbed and dry once applied.

Very Disliked Full details ->

Propylene Glycol Humectant, Skin Conditioning, Solvent

0 / 0

May worsen Eczema

Propylene Glycol is an odorless, colorless liquid. As a humectant, it helps skin retain moisture. It also aids in delivering active ingredients.

0 Com. / 0 Irr.

Very Disliked Full details ->

Cetearyl Alcohol Emollient, Emulsifying, Emulsion Stabilising

2 / 1

Fatty Alcohol • 3 Concerns

Cetearyl alcohol is a mixture of two fatty alcohols: cetyl alcohol and stearyl alcohol. It is mainly used as an emulsifier. Emulsifiers help prevent the separation of oils and products. Due to its composition, it can also be used to thicken a product or help create foam.

2 Com. / 1 Irr.

Very Disliked Full details ->

Dicaprylyl Ether Emollient, Skin Conditioning, Solvent

Dicaprylyl Ether is created from caprylic acid. It is a texture-enhancer and emollient.

Liked Full details ->

Cetyl Esters Emollient, Skin Conditioning

1 / 1

Not safe for Fungal Acne

Cetyl Esters is a synthetic wax made up of mostly fatty acids and fatty alcohols. It is strcturally similar to wax taken from whales.

1 Com. / 1 Irr.

Very Disliked Full details ->

Behentrimonium Chloride Preservative

Preservative

This ingredient is a preservative and often used for it's anti-static properties. You'll most likely see this ingredient in hair conditioners.

Liked Full details ->

Polysorbate 20 Emulsifying

0 / 0

Not safe for Fungal Acne

Polysorbate 20 is made by combining ethoxylation of sorbitan, ethylene oxide, and lauric acid. It is a mild cleansing agent, surfactant, and emulsifier.

0 Com. / 0 Irr.

Very Disliked Full details ->

Sh-Oligopeptide-78

Peptide

Sh-Oligopeptide-78 is a peptide.

Unknown Full details ->

Hydrolyzed Wheat Protein Skin Conditioning

We don't have a description for Hydrolyzed Wheat Protein.

Disliked Full details ->

Hydrolyzed Wheat Starch Skin Conditioning

We don't have a description for Hydrolyzed Wheat Starch.

Unknown Full details ->

Isopropyl Alcohol Solvent

0 / 0

Alcohol • 5 Concerns

Isopropyl Alcohol is more commonly known as rubbing alcohol. It is most commonly used as a solvent, meaning it helps other ingredients dissolve.

0 Com. / 0 Irr.

Very Disliked Full details ->

Tocopherol Antioxidant, Masking, Skin Conditioning

0-3 / 0-3

Vitamin E • Antioxidant • 4 Benefits • May cause irritation

Tocopherol (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.

0-3 Com. / 0-3 Irr.

Liked Full details ->

Phenoxyethanol Preservative

Preservative

Phenoxyethanol is a preservative that has germicide, antimicrobial, and aromatic properties. Studies show that phenoxyethanol can prevent germ and microbial growth. By itself, it has a scent that is similar to that of a rose.

Very Disliked Full details ->

Potassium Sorbate Preservative

Preservative

Potassium Sorbate is a preservative used to prevent yeast and mold in products. It is commonly found in both cosmetic and food products.

Disliked Full details ->

Citric Acid Buffering, Masking

AHA • 4 Benefits • 2 Concerns

Citric Acid is an AHA derived from citrus fruits (think oranges, lemons, and limes!).

Disliked Full details ->

Parfum Masking, Perfuming

Fragrance • 2 Concerns

Parfum is a catch-all term for an ingredient or more that is used to give aroma to products. Parfum, or fragrance, 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.

Very Disliked Full details ->

Geraniol Perfuming, Tonic

Fragrance • EU Allergen

Geraniol is used to add fragrance/parfum to a product. It is the main component of citronellol. It is a monoterpenoid and an alcohol.

Very Disliked Full details ->

Linalool Perfuming

Fragrance • 2 Concerns

Linalool is a fragrance and helps add scent to products. It's derived from common plants such as cinnamon, mint, citrus, and lavender.

Very Disliked Full details ->

Hexyl Cinnamal Perfuming

Fragrance • EU Allergen

Hexyl Cinnamal is a fragrance ingredient with a similar scent to jasmine. It can be naturally found in chamomile essential oil.

Very Disliked Full details ->

Benzyl Alcohol Perfuming, Preservative, Solvent

Alcohol • Fragrance • Preservative • 6 Concerns

Benzyl Alcohol is most commonly used as a preservative. It also has a subtle, sweet smell. Small amounts of Benzyl Alcohol is not irritating and safe to use in skincare products. Most Benzyl Alcohol is derived from fruits such as apricots.

Very Disliked Full details ->

Peptide Volumizing Hair Treatment

Water Skin Conditioning, Solvent

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.

Loved Full details ->

Pisum Sativum Peptide Skin Conditioning

Peptide

Pisum Sativum Peptide is a peptide.

Unknown Full details ->

Betaine Humectant, Skin Conditioning

3 Benefits

Betaine is a common humectant (a substance that promotes retention of moisture). It's known to be gentle on the skin and can help balance hydration.

Loved Full details ->

Glycerin Humectant, Skin Conditioning, Skin Protecting

0 / 0

2 Benefits

Glycerin is already naturally found in your skin. It helps moisturize and protect your skin.

0 Com. / 0 Irr.

Loved Full details ->

Panthenol Skin Conditioning

0 / 0

Helps reduce irritation

Panthenol (also referred to as pro-vitamin B5) is a common ingredient that helps hydrate and soothe the skin.

0 Com. / 0 Irr.

Loved Full details ->

Peg-40 Hydrogenated Castor Oil Emulsifying

Oil • Not safe for Fungal Acne

Peg-40 Hydrogenated Castor Oil is derived from castor oil and polyethylene glycol (PEG). It is used as a emollient and emulsifier.

Very Disliked Full details ->

Phenoxyethanol Preservative

Preservative

Very Disliked Full details ->

Polyquaternium-37

We don't have a description for Polyquaternium-37.

Liked Full details ->

Citronellyl Methylcrotonate Masking, Perfuming

Fragrance

Citronellyl Methylcrotonate is a fragrance.

Unknown Full details ->

Ethylhexylglycerin Skin Conditioning

Ethylhexylglycerin (we can't pronounce this either) is commonly used as a preservative and skin softener. It is derived from glyceryl.

Mixed Full details ->

Ceratonia Siliqua Seed Extract Skin Conditioning

We don't have a description for Ceratonia Siliqua Seed Extract.

Unknown Full details ->

Hydrolyzed Soy Protein Humectant, Skin Conditioning

We don't have a description for Hydrolyzed Soy Protein.

Disliked Full details ->

Zea Mays Starch Abrasive, Absorbent, Skin Protecting

Exfoliant

Zea Mays Starch is starch made from corn. You might know this as cornstarch . It is used to thicken a product. It can replace talc as an absorbent.

Disliked Full details ->

Leuconostoc/Radish Root Ferment Filtrate Antimicrobial

Leuconostoc/Radish Root Ferment Filtrate is a natural preservative. It comes from fermenting radish roots with a bacteria called leuconostoc. Leuconostoc comes from lactic acid. This bacteria is used to make the traditional Korean side-dish, kimchi. It is also used to make sourdough bread (both incredibly yummy foods).

Liked Full details ->

Trisodium Ethylenediamine Disuccinate

Trisodium Ethylenediamine Disuccinate is used to help stabilize a product.

Liked Full details ->

Polyquaternium-16

We don't have a description for Polyquaternium-16.

Unknown Full details ->

Potassium Sorbate Preservative

Preservative

Potassium Sorbate is a preservative used to prevent yeast and mold in products. It is commonly found in both cosmetic and food products.

Disliked Full details ->

Sodium Benzoate Masking, Preservative

Preservative

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.

Disliked Full details ->

Guar Hydroxypropyltrimonium Chloride Skin Conditioning

This ingredient is derived from guar gum.

Liked Full details ->

Polyquaternium-7

Polyquaternium-7 is a light to clear colored liquid. It is commonly found in haircare products for its film-forming and anti-static properties.

Unknown Full details ->

Ingredients Explained

These ingredients are found in both products.

Ingredients higher up in an ingredient list are typically present in a larger amount.

Water

Skin Conditioning, Solvent

Loved

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. Talk about multi-purpose! If you see this, drink a glass of water. Stay hydrated!

Learn more about Water

Phenoxyethanol

Preservative

Very Disliked

It's often used in formulations along with Caprylyl Glycol to preserve the shelf life of products.

Potassium Sorbate

Preservative

Disliked

Potassium Sorbate is a preservative used to prevent yeast and mold in products. It is commonly found in both cosmetic and food products.

Potassium sorbate is potassium salt derived from sorbic acid. Sorbic acid is a natural antibiotic and effective against fungus.

Potassium sorbate and sorbic acid can be found in baked goods, cheeses, dried meats, dried fruit, ice cream, pickles, wine, yogurt, and more.

Potassium sorbate is often used with stronger preservatives.