K18 Hair PEPTIDE PREP™ pH Maintenance Shampoo Versus Elizavecca Cer-100 Collagen Coating Hair Muscle Shampoo

K18 Hair PEPTIDE PREP™ pH Maintenance Shampoo Versus Elizavecca Cer-100 Collagen Coating Hair Muscle Shampoo

What's inside

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

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

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

Lauryl Betaine

Disodium Laureth Sulfosuccinate

Sodium Chloride

Dipropylene Glycol

PEG-12 Dimethicone

Polyquaternium-10

Sodium Cocoyl Glutamate

Polyquaternium-67

PEG-12 Allyl Ether

1,2-Hexanediol

Butylene Glycol

Disodium Cocoyl Glutamate

Polyquaternium-11

Sodium Benzoate

Illicium Verum Fruit Extract

Disodium EDTA

Polyquaternium-7

Ceramide NP

Hydrolyzed Collagen

Decyl Glucoside

Gelatin

Hydrolyzed Keratin

Avena Sativa Protein Extract

Hydrolyzed Corn Protein

Hydrolyzed Soy Protein

Hydrolyzed Wheat Protein

Moringa Oleifera Seed Extract

Propolis Extract

Salix Alba Bark Extract

Origanum Vulgare Leaf Extract

Chamaecyparis Obtusa Leaf Extract

Lactobacillus/Soybean Ferment Extract

Cinnamomum Cassia Bark Extract

Scutellaria Baicalensis Root Extract

Portulaca Oleracea Extract

Beta-Glucan

Water, Lauryl Betaine, Disodium Laureth Sulfosuccinate, Glycerin, Sodium Chloride, Dipropylene Glycol, PEG-12 Dimethicone, Polyquaternium-10, Sodium Cocoyl Glutamate, Polyquaternium-67, Parfum, PEG-12 Allyl Ether, Citric Acid, 1,2-Hexanediol, Caprylyl Glycol, Butylene Glycol, Disodium Cocoyl Glutamate, Polyquaternium-11, Sodium Benzoate, Illicium Verum Fruit Extract, Disodium EDTA, Polyquaternium-7, Ceramide NP, Hydrolyzed Collagen, Decyl Glucoside, Gelatin, Hydrolyzed Keratin, Avena Sativa Protein Extract, Hydrolyzed Corn Protein, Hydrolyzed Soy Protein, Hydrolyzed Wheat Protein, Moringa Oleifera Seed Extract, Propolis Extract, Salix Alba Bark Extract, Origanum Vulgare Leaf Extract, Chamaecyparis Obtusa Leaf Extract, Lactobacillus/Soybean Ferment Extract, Cinnamomum Cassia Bark Extract, Scutellaria Baicalensis Root Extract, Portulaca Oleracea Extract, Beta-Glucan

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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.

Caprylyl Glycol is a humectant, skin conditioner, emollient, and preservative booster derived from either caprylic acid or synthetically created.

Typical use levels vary from 0.3-1% as a preservative booster and go up to 2% to condition skin.

Because it is not a free-fatty acid, this ingredient is fungal acne safe (there's nothing for Malassezia to feed on).

Citric Acid is an alpha hydroxy acid (AHA) naturally found in citrus fruits like oranges, lemons, and limes.

Like other AHAs, citric acid can exfoliate skin by breaking down the bonds that hold dead skin cells together. This helps reveal smoother and brighter skin underneath.

However, this exfoliating effect only happens at high concentrations (20%) which can be hard to find in cosmetic products.

Due to this, citric acid is usually included in small amounts as a pH adjuster. This helps keep products slightly more acidic and compatible with skin's natural pH.

In skincare formulas, citric acid can:

While it can provide some skin benefits, research shows lactic acid and glycolic acid are generally more effective and less irritating exfoliants.

Most citric acid used in skincare today is made by fermenting sugars (usually from molasses). This synthetic version is identical to the natural citrus form but easier to stabilize and use in formulations.

Rosacea skin has a lower threshold for acids generally, with 62.5% of rosacea subjects in one study reacting to lactic acid in a sting test. This is why we mark citric acid as a potential rosacea trigger.

However, this ingredient shows up as a pH adjuster or chelator at roughly 0.1-1% in many products. These low levels are unlikely to be an issue for rosacea skin and becomes a potential trigger at exfoliating concentrations (20%). Because everybody's skin is unique, we recommend a patch test if you are unsure.

Glycerin (or glycerol) is a compound naturally found in your skin. It's a powerhouse humectant that pulls water into the stratum corneum.

Topically, glycerin does several things at once:

Your skin makes glycerin on its own (mostly from sebaceous oil breakdown) and shuttles it to your outermost layer of skin, or your epidermis, via aquaporin-3.

Aquaporin-3 is a transporter that is essential for normal skin hydration, elasticity, and repair. Interestingly, mice lacking in AQP3 have dry and less elastic skin that can be fully corrected with glycerin.

This ingredient is non-irritating, plays well with almost every ingredient, and works across all skin types. Typical use is anywhere between 3-10% but can go up to 79% in some leave-on products.

Just know very high concentrations (>40%) can feel tacky in low humidity.

Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.

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.

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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