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

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

Pisum Sativum Peptide

Betaine

Glycerin

Panthenol

PEG-40 Hydrogenated Castor Oil

Polyquaternium-37

Citronellyl Methylcrotonate

Ethylhexylglycerin

Ceratonia Siliqua Seed Extract

Hydrolyzed Soy Protein

Zea Mays Starch

Leuconostoc/Radish Root Ferment Filtrate

Trisodium Ethylenediamine Disuccinate

Polyquaternium-16

Sodium Benzoate

Guar Hydroxypropyltrimonium Chloride

Polyquaternium-7

Water, Pisum Sativum Peptide, Betaine, Glycerin, Panthenol, PEG-40 Hydrogenated Castor Oil, Phenoxyethanol, Polyquaternium-37, Citronellyl Methylcrotonate, Ethylhexylglycerin, Ceratonia Siliqua Seed Extract, Hydrolyzed Soy Protein, Zea Mays Starch, Leuconostoc/Radish Root Ferment Filtrate, Trisodium Ethylenediamine Disuccinate, Polyquaternium-16, Potassium Sorbate, Sodium Benzoate, Guar Hydroxypropyltrimonium Chloride, Polyquaternium-7

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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.

Phenoxyethanol is one of the most widely used preservatives in skincare (and for good reason!).

It has a large spectrum of antimicrobial activity and especially effective bacteria, yeast, and mold while only having a weak effect on your skin's natural microbiome.

On a cellular level, it disrupts the cell membranes of microbes by poking holes that make the cell leak. This shuts down the chemical reactions the microbe needs to make energy so it can no longer survive.

Another perk of this ingredient is that it stays functional across a wide pH range (3-10).

You'll often see it paired with boosters like Ethylhexylglycerin; one study showed that a 1:9 ratio of Ethylhexylglycerin to Phenoxyethanol damages bacterial membranes as effectively as doubling the Phenoxyethanol concentration on its own.

Typical use concentrations range from 0.3-1% depending on the formula, and this ingredient is capped at 1% int the EU.

Safety-wise, the fear mongering does not hold up to the evidence. The EU's Scientific Committee on Consumer Safety and FDA consider it safe as a preservative at up to 1%, including for children of all ages.

Adverse systemic effects only showed up in animal studies at exposures roughly 200x higher than what people get from cosmetics. And despite its very widespread use, this ingredient is a rare sensitizer and allergic reactions are uncommon.

Potassium 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.

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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