K18 Hair Leave-In Molecular Repair Hair Mask Versus COSRX Peptide-132 Ultra Perfect Hair Bonding Treatment

K18 Hair Leave-In Molecular Repair Hair Mask Versus COSRX Peptide-132 Ultra Perfect Hair Bonding Treatment

What's inside

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

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

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

Glycerin

Dimethicone

Cetyl Ethylhexanoate

Isopentyldiol

Cetyl Alcohol

Stearyl Alcohol

Coco-Caprylate/Caprate

Stearamidopropyl Dimethylamine

Sorbitol

Dipropylene Glycol

Dimethiconol

Hydroxypropyl Starch Phosphate

Amodimethicone

Lactic Acid

Maltitol

Caprylyl Glycol

Trideceth-10

Sodium Gluconate

Ethylhexylglycerin

Anthemis Nobilis Flower Water

1,2-Hexanediol

Propanediol

Argania Spinosa Kernel Oil

Olea Europaea Fruit Oil

Camellia Japonica Seed Oil

Simmondsia Chinensis Seed Oil

Oryza Sativa Bran Oil

Vitis Vinifera Seed Oil

Biotin

Tripeptide-13

Macadamia Ternifolia Seed Oil

Sodium Hyaluronate

Laminaria Japonica Extract

Sodium Metaphosphate

Avena Sativa Peptide

Arginine

Serine

Glutamic Acid

Threonine

Leucine

Proline

Aspartic Acid

Isoleucine

Glycine

Soluble Collagen

Hydrolyzed Hyaluronic Acid

Phenylalanine

Alanine

Tyrosine

Lysine

Sodium Hyaluronate Crosspolymer

Histidine

Hyaluronic Acid

Caffeine

Panthenol

Niacinamide

Hydrogenated Lecithin

Butylene Glycol

Valine

Sodium Acetylated Hyaluronate

Stearic Acid

Methionine

Cystine

Tryptophan

Ceramide NP

Hydrolyzed Vegetable Protein

Ceramide Ns

Phytosphingosine

Cholesterol

Ceramide AP

Ceramide As

Ceramide EOP

Water, Glycerin, Dimethicone, Cetyl Ethylhexanoate, Isopentyldiol, Cetyl Alcohol, Stearyl Alcohol, Behentrimonium Chloride, Coco-Caprylate/Caprate, Stearamidopropyl Dimethylamine, Sorbitol, Dipropylene Glycol, Dimethiconol, Hydroxypropyl Starch Phosphate, Amodimethicone, Lactic Acid, Maltitol, Parfum, Caprylyl Glycol, Trideceth-10, Sodium Gluconate, Ethylhexylglycerin, Anthemis Nobilis Flower Water, 1,2-Hexanediol, Propanediol, Argania Spinosa Kernel Oil, Olea Europaea Fruit Oil, Camellia Japonica Seed Oil, Simmondsia Chinensis Seed Oil, Oryza Sativa Bran Oil, Vitis Vinifera Seed Oil, Biotin, Tripeptide-13, Macadamia Ternifolia Seed Oil, Sodium Hyaluronate, Tocopherol, Laminaria Japonica Extract, Sodium Metaphosphate, Avena Sativa Peptide, Arginine, Serine, Glutamic Acid, Threonine, Leucine, Proline, Aspartic Acid, Isoleucine, Glycine, Soluble Collagen, Hydrolyzed Hyaluronic Acid, Phenylalanine, Alanine, Tyrosine, Lysine, Sodium Hyaluronate Crosspolymer, Histidine, Hyaluronic Acid, Caffeine, Panthenol, Niacinamide, Hydrogenated Lecithin, Butylene Glycol, Cetearyl Alcohol, Valine, Sodium Acetylated Hyaluronate, Stearic Acid, Methionine, Cystine, Tryptophan, Ceramide NP, Hydrolyzed Vegetable Protein, Ceramide Ns, Phytosphingosine, Cholesterol, Ceramide AP, Ceramide As, Ceramide EOP

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Alternatives

Ingredients Explained

These ingredients are found in both products.

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

This 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%.

Cetearyl alcohol is a waxy mixture of two fatty alcohols: cetyl alcohol and stearyl alcohol. It is an emollient and emulsifier.

Despite having "alcohol" in its name, it has nothing to do with drying solvent alcohols; the FDA also allows "alcohol-free" products to contain fatty alcohols like this ingredient.

It plays several roles in a formula:

Typical use levels for this ingredient sit around 1-10% and the Cosmetic Ingredient Review Expert Panel has affirmed safety at concentrations up to 25% in leave-on products.

Multiple assessments have found it to be non-irritating and non-sensitizing to most people.

However, there have been some cases of allergic contact dermatitis in patients with chronically compromised skin barriers.

Cetearyl alcohol has a comedogenic rating of 2 and irritancy rating of 1. Both of these numbers come from the 1989 study that used rabbit ears; a "2" means mildly comedogenic and a "1" means low irritancy.

Here's the catch: rabbit skin is more sensitive than human skin and throws a lot of false positives. A 1996 reappraisal found that ingredients rated 1-2 in the rabbit ear tests are generally safe for humans.

Remember comedogenic ratings are unable to assess the entire formula of a product or how it will react on your skin. Just be sure to patch test if you are unsure about certain ingredients.

This ingredient is not fungal acne safe. Cetearyl alcohol is a fatty alcohol with chain lengths that fall within the range that Malassezia can metabolize.

A 2019 study has also observed Malassezia growth in the presence of this ingredient, confirming it to be not-fungal acne safe.

Parfum 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.

Tocopherol is a fat-soluble antioxidant known as Vitamin E.

You'll find this ingredient in the vast majority of skincare (for good reason). It works to neutralize free radicals, or unstable molecules generated by UV exposure, pollution, and other environmental stressors, before they can cause oxidative damage to your skin cells.

Topically applied tocopherol has been shown to protect against UV damage by ramping up the skin's own natural defense enzymes.

It also acts as a skin conditioning agent; some studies show that regular topical use can improve the skin's water-binding capacity over 2-4 weeks.

This ingredient is especially loved for being a team player. When combined with Vitamin C, the photoprotective effect of both ingredients roughly doubles and the combo also helps reduce UV-induced DNA damage.

This ingredient has some brightening potential but it's more of a prevention ingredient than spot-fader. Cell studies show it can slow down melanin production but it's worth noting that it's not the most powerful brightener out there.

In formulations, it also serves as a stabilizer that helps protect other oxidation-prone ingredients from degrading.

Concentrations usually range from 0.1-1% in most leave-on products.

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. Remember to stay hydrated!

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