Kevin Murphy Maxi Wash Versus K18 Hair PEPTIDE PREP™ Clarifying Detox Shampoo

Kevin Murphy Maxi Wash Versus K18 Hair PEPTIDE PREP™ Clarifying Detox Shampoo

What's inside

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

Water

Cocamidopropylamine Oxide

Cocamidopropyl Hydroxysultaine

Disodium Laureth Sulfosuccinate

Sodium Polystyrene Sulfonate

Sodium Lauryl Sulfoacetate

Sodium Lauroyl Sarcosinate

Chamomilla Recutita Flower Extract

Citrus Grandis Fruit Extract

Rosmarinus Officinalis Leaf Extract

Thymus Vulgaris Extract

Salvia Sclarea Oil

Saccharum Officinarum Extract

Hamamelis Virginiana Bark/Leaf/Twig Extract

Melaleuca Alternifolia Leaf Oil

Lactic Acid

Glycerin

Glycereth-26

PEG-7 Glyceryl Cocoate

Glycereth-7 Caprylate/Caprate

Disteareth-75 Ipdi

Malic Acid

Disodium EDTA

Tetrasodium EDTA

Sodium Bicarbonate

Phenoxyethanol

Ethylhexylglycerin

Chlorphenesin

Sorbic Acid

Benzoic Acid

Sodium Benzoate

Citric Acid

Parfum

Limonene

Water, Cocamidopropylamine Oxide, Cocamidopropyl Hydroxysultaine, Disodium Laureth Sulfosuccinate, Sodium Polystyrene Sulfonate, Sodium Lauryl Sulfoacetate, Sodium Lauroyl Sarcosinate, Chamomilla Recutita Flower Extract, Citrus Grandis Fruit Extract, Rosmarinus Officinalis Leaf Extract, Thymus Vulgaris Extract, Salvia Sclarea Oil, Saccharum Officinarum Extract, Hamamelis Virginiana Bark/Leaf/Twig Extract, Melaleuca Alternifolia Leaf Oil, Lactic Acid, Glycerin, Glycereth-26, PEG-7 Glyceryl Cocoate, Glycereth-7 Caprylate/Caprate, Disteareth-75 Ipdi, Malic Acid, Disodium EDTA, Tetrasodium EDTA, Sodium Bicarbonate, Phenoxyethanol, Ethylhexylglycerin, Chlorphenesin, Sorbic Acid, Benzoic Acid, Sodium Benzoate, Citric Acid, Parfum, Limonene

Sodium C14-16 Olefin Sulfonate

Salicylic Acid

Charcoal Powder

Sh-Oligopeptide-78

Panthenol

Sodium Phytate

Guar Hydroxypropyltrimonium Chloride

Caprylyl Glycol

Caprylhydroxamic Acid

Potassium Hydroxide

Sodium Hydroxide

Benzyl Salicylate

Water, Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Hydroxysultaine, Salicylic Acid, Charcoal Powder, Sh-Oligopeptide-78, Panthenol, Glycerin, Sodium Phytate, Guar Hydroxypropyltrimonium Chloride, Caprylyl Glycol, Caprylhydroxamic Acid, Citric Acid, Potassium Hydroxide, Sodium Hydroxide, Parfum, Benzyl Salicylate, Limonene

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Ingredients Explained

These ingredients are found in both products.

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

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.

Cocamidopropyl Hydroxysultaine is a synthetic cleansing agent, though it is derived from coconut oil.

It is used to enhance the texture of products by boosting lather and thickening the texture. As a cleanser, Cocamidopropyl Hydroxysultaine is mild.

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.

Limonene is a fragrance that adds scent and taste to a formulation.

It's found in the peel oil of citrus fruits and other plants such as lavender and eucalyptus. The scent of limonene is generally described as "sweet citrus".

Limonene acts as an antioxidant, meaning it helps neutralize free radicals.

When exposed to air, oxidized limonene may sensitize the skin. Because of this, limonene is often avoided by people with sensitive skin.

The term '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.

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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