Revolution Beauty R-Peptide 4x4 Leave In Restore Mask Versus K18 Hair Leave-In Molecular Repair Hair Mask
Updated on August 26, 2024
Overview
What they are
These products are both vegan, cruelty-free, and reef safe . They have a total of 13 ingredients in common
Cool Features
They both contain peptides and 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 harsh alcohols, 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
Revolution Beauty R-Peptide 4x4 Leave In Restore Mask 53 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
Revolution Beauty R-Peptide 4x4 Leave In Restore Mask 53 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 ConditioningAlcohol Denat.
Antimicrobial
Cetearyl Alcohol
Emollient
Propanediol
SolventBehentrimonium Chloride
Preservative
Polysorbate 20
Emulsifying
Arginine Hcl
Skin ConditioningDicaprylyl Ether
EmollientCetyl Alcohol
Emollient
Isododecane
EmollientMaleic Acid
BufferingCannabis Sativa Seed Oil
Emollient
Parfum
Masking
Butylene Glycol
Humectant
Hydrogenated Polydecene
EmollientPhenoxyethanol
Preservative
Dimethicone
Emollient
Bis-PCA Dimethicone
Glycerin
Humectant
Isopropyl Alcohol
Solvent
Sodium Hydroxide
BufferingSodium PCA
HumectantAminomethyl Propanol
BufferingSodium Lactate
Buffering4-PCA Dimethicone
Skin Conditioning
Disodium PEG-12 Dimethicone Sulfosuccinate
CleansingStearyl Alcohol
Emollient
Ethylhexylglycerin
Skin ConditioningArginine
Masking
Aspartic Acid
MaskingPCA
HumectantChenopodium Quinoa Seed Extract
Skin ConditioningGlycine
Buffering
Alanine
MaskingSerine
MaskingValine
MaskingCopper Tripeptide-34
Skin Conditioning
Proline
Skin ConditioningThreonine
Isoleucine
Skin ConditioningPotassium Sorbate
Preservative
Sodium Benzoate
Masking
Histidine
HumectantPhenylalanine
MaskingTocopherol
Antioxidant
Caprylyl Glycol
EmollientHexylene Glycol
EmulsifyingAlpha-Isomethyl Ionone
Perfuming
Benzyl Benzoate
Antimicrobial
Eugenol
Perfuming
Hexyl Cinnamal
Perfuming
Limonene
Perfuming
Linalool
Perfuming
Water, Alcohol Denat., Cetearyl Alcohol, Propanediol, Behentrimonium Chloride, Polysorbate 20, Arginine Hcl, Dicaprylyl Ether, Cetyl Alcohol, Isododecane, Maleic Acid, Cannabis Sativa Seed Oil, Parfum, Butylene Glycol, Hydrogenated Polydecene, Phenoxyethanol, Dimethicone, Bis-PCA Dimethicone, Glycerin, Isopropyl Alcohol, Sodium Hydroxide, Sodium PCA, Aminomethyl Propanol, Sodium Lactate, 4-PCA Dimethicone, Disodium PEG-12 Dimethicone Sulfosuccinate, Stearyl Alcohol, Ethylhexylglycerin, Arginine, Aspartic Acid, PCA, Chenopodium Quinoa Seed Extract, Glycine, Alanine, Serine, Valine, Copper Tripeptide-34, Proline, Threonine, Isoleucine, Potassium Sorbate, Sodium Benzoate, Histidine, Phenylalanine, Tocopherol, Caprylyl Glycol, Hexylene Glycol, Alpha-Isomethyl Ionone, Benzyl Benzoate, Eugenol, Hexyl Cinnamal, Limonene, Linalool
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 WaterAlcohol Denat. is an alcohol with a denaturant property. It is created by mixing ethanol with other additives.
This ingredient gets a bad rep because it is irritating and drying - mostly due to its astringent property. Astringents draw out natural oils in tissue, constricting pores and leaving your skin dried out.
However, alcohol denat. is not all that bad.
Due to its low molecular weight, alcohol denat. tends to evaporate quickly. One study on pig skin found half of applied alcohol evaporated in 10 seconds and less than 3% stayed on skin.
This also helps other ingredients become better absorbed upon application.
Studies are conflicted about whether this ingredient causes skin dehydration. One study from 2005 found adding emollients to propanol-based sanitizer decreased skin dryness and irritation. Another study found irritation only occurs if your skin is already damaged.
Small amounts of alcohol are generally tolerated by oily skin or people who live in humid environments.
The rule of thumb is if this alcohol is near the end of an ingredients list, it will probably not affect your skin much.
Also...
This ingredient has antimicrobial and solvent properties.
The antimicrobial property helps preserve products and increase their shelf life. As a solvent, it helps dissolve other ingredients.
Other types of astringent alcohols include:
Learn more about Alcohol Denat.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.
Cetearyl alcohol is an emollient. Emollients help soothe and hydrate the skin by trapping moisture.
Studies show Cetearyl alcohol is non-toxic and non-irritating. The FDA allows products labeled "alcohol-free" to have fatty alcohols.
This ingredient is usually derived from plant oils such as palm, vegetable, or coconut oils. There is debate on whether this ingredient will cause acne.
Due to the fatty acid base, this ingredient may not be Malassezia folliculitis safe.
Learn more about Cetearyl AlcoholThis ingredient is a preservative and often used for it's anti-static properties. You'll most likely see this ingredient in hair conditioners.
It does not cause irritation or sensitization in leave-on products at 1-5%.
Polysorbate 20 is made by combining ethoxylation of sorbitan, ethylene oxide, and lauric acid. It is a mild cleansing agent, surfactant, and emulsifier.
As a surfactant, it helps collect dirt and oils for washing. Emulsifiers prevent oils and water from separating.
Polysorbate 20 also adds scent to a product. Since it is made using sorbitol, it has a sweet scent. Sorbitol can also be found in fruits such as apples and peaches.
The lauric acid used to create Polysorbate 20 is often derived from coconuts.
Polysorbate 20 may not be fungal acne safe.
Learn more about Polysorbate 20Dicaprylyl Ether is created from caprylic acid. It is a texture-enhancer and emollient.
As an emollient, Dicaprylyl Ether is non-comedogenic. It helps soften and smooth the skin by creating a barrier on top. This barrier helps trap moisture in, helping to hydrate the skin.
Dicaprylyl Ether gives a non-greasy feel and better spreadability to products.
Learn more about Dicaprylyl EtherParfum 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 ParfumPhenoxyethanol 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.
Isopropyl Alcohol is more commonly known as rubbing alcohol. It is most commonly used as a solvent, meaning it helps other ingredients dissolve.
This ingredient is an astringent alcohol. Astringent alcohols may also irritate skin as they high amounts may strip away your skin's natural oils.
Other types of astringent alcohols include:
According to the National Rosacea Society based in the US, you should be mindful of products with these alcohols in the top half of ingredients.
Any type of sanitizing product will have high amounts of alcohol to help kill bacteria and viruses.
Learn more about Isopropyl AlcoholPotassium Sorbate is a preservative used to prevent yeast and mold in products. It is commonly found in both cosmetic and food products.
This ingredient comes from potassium salt derived from sorbic acid. Sorbic acid is a natural antibiotic and effective against fungus.
Both potassium sorbate and sorbic acid can be found in baked goods, cheeses, dried meats, dried fruit, ice cream, pickles, wine, yogurt, and more.
You'll often find this ingredient used with other preservatives.
Learn more about Potassium SorbateTocopherol (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 TocopherolHexyl 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 LinaloolIngredient Ratings
Here's what our community thinks of the ingredients in these products.
When to use
Revolution Beauty R-Peptide 4x4 Leave In Restore Mask 53 ingredients
K18 Hair Leave-In Molecular Repair Hair Mask 21 ingredients
Reviews
Here's what our community thinks
Revolution Beauty R-Peptide 4x4 Leave In Restore Mask 53 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.
