Renpure Biotin & Collagen Thickening Shampoo Versus Coco & Eve Super Hydrating Shampoo

Renpure Biotin & Collagen Thickening Shampoo Versus Coco & Eve Super Hydrating Shampoo

What's inside

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

Glycol Distearate

Laureth-4

Citric Acid

Sodium Chloride

Methylchloroisothiazolinone

Methylisothiazolinone

Parfum

Water

Coco/Oleamidopropyl Betaine

Sodium C14-16 Olefin Sulfonate

PEG-4 Rapeseedamide

Glycerin

Biotin

Hydrolyzed Collagen

Cocos Nucifera Oil

Guar Hydroxypropyltrimonium Chloride

Theobroma Cacao Extract

Hydrolyzed Pea Protein

Aesculus Hippocastanum Seed Extract

PEG-7 Dimethicone

Laureth-7

Polysorbate 20

Glycol Distearate, Laureth-4, Citric Acid, Sodium Chloride, Methylchloroisothiazolinone, Methylisothiazolinone, Parfum, Water, Coco/Oleamidopropyl Betaine, Sodium C14-16 Olefin Sulfonate, PEG-4 Rapeseedamide, Glycerin, Biotin, Hydrolyzed Collagen, Cocos Nucifera Oil, Guar Hydroxypropyltrimonium Chloride, Theobroma Cacao Extract, Hydrolyzed Pea Protein, Aesculus Hippocastanum Seed Extract, PEG-7 Dimethicone, Laureth-7, Polysorbate 20

Sodium Methyl Cocoyl Taurate

Cetyl Betaine

Sodium Cocoamphoacetate

Lauryl Glucoside

Ananas Sativus Fruit Extract

Nephelium Lappaceum Branch/Fruit/Leaf Extract

Hydrolyzed Hyaluronic Acid

Argania Spinosa Kernel Oil

Ficus Carica Fruit Extract

Persea Gratissima Oil

Sapindus Trifoliatus Fruit Extract

Sodium Hyaluronate

Cocos Nucifera Fruit Juice

Cocos Nucifera Water

Psidium Guajava Fruit Extract

Phospholipids

Polyquaternium-22

Sodium Cocoyl Glutamate

Sodium Lauryl Glucose Carboxylate

Sodium Stearoyl Lactylate

Glyceryl Caprylate

Glyceryl Stearate

Propanediol

Cetearyl Alcohol

Tetrasodium Glutamate Diacetate

Glyceryl Undecylenate

Polyglyceryl-10 Dioleate

Polyglyceryl-10 Oleate

Cocamidopropyl Betaine

Acrylates/C10-30 Alkyl Acrylate Crosspolymer

Sodium Benzoate

Potassium Sorbate

Benzyl Salicylate

Coumarin

Linalool

Water, Sodium C14-16 Olefin Sulfonate, Sodium Methyl Cocoyl Taurate, Cetyl Betaine, Sodium Cocoamphoacetate, Lauryl Glucoside, Glycerin, Cocos Nucifera Oil, Ananas Sativus Fruit Extract, Nephelium Lappaceum Branch/Fruit/Leaf Extract, Hydrolyzed Hyaluronic Acid, Argania Spinosa Kernel Oil, Ficus Carica Fruit Extract, Persea Gratissima Oil, Hydrolyzed Pea Protein, Sapindus Trifoliatus Fruit Extract, Sodium Hyaluronate, Cocos Nucifera Fruit Juice, Cocos Nucifera Water, Psidium Guajava Fruit Extract, Phospholipids, Glycol Distearate, Polyquaternium-22, Sodium Cocoyl Glutamate, Sodium Lauryl Glucose Carboxylate, Sodium Stearoyl Lactylate, Glyceryl Caprylate, Glyceryl Stearate, Propanediol, Cetearyl Alcohol, Tetrasodium Glutamate Diacetate, Glyceryl Undecylenate, Polyglyceryl-10 Dioleate, Polyglyceryl-10 Oleate, Guar Hydroxypropyltrimonium Chloride, Cocamidopropyl Betaine, Laureth-4, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Sodium Benzoate, Potassium Sorbate, Parfum, Benzyl Salicylate, Coumarin, Linalool, Citric Acid

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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.

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.

This ingredient is also known as coconut oil. It is a plant-derived ingredient with skin conditioning properties.

The fatty acid profile of coconut oil is mostly lauric acid (~54%), followed by capric, caprylic, palmitic, and myristic acids. This profile allows it to penetrate easily into skin, moisturize, and improve dry skin.

A double-blind study confirmed that extra virgin coconut oil is as effective as mineral oil for treating very dry skin. Another study found it outperformed mineral oil for mild to moderate atopic dermatitis in children.

Another study from 2018 found that virgin coconut oil can soothe inflammation and boost key skin barrier proteins. Just know this evidence is still only from lab settings and not human trials.

It has also been shown to reduce Staphylococcus aureus, a bacteria that commonly overgrows in people with eczema.

Clinical testing shows very minimal skin irritation and no evidence of sensitization or phototoxicity.

Coconut oil gets flagged as a "fragrance" because it has a natural mild scent (not because it's a synthetic perfume). The European Cosmetic ingredient database also lists "perfuming" as a function of this ingredient.

Just so you know, the term "fragrance" is completely unregulated. Some brands still use botanical extracts or essential oils in their "fragrance-free" formulas, but regulatory databases technically classify these under "fragrance".

Coconut oil has a tiny and useless bit of natural SPF. Early lab studies clocked it around SPF 7-8 but a more recent study found the real number closer to SPF 1.2. It also offers no meaningful UVA protection (SPF only overs UVB rays).

The comedogenic rating of 4/5 means it has a high potential to clog pores; but it's worth noting that comedogenicity is highly individual and ratings cannot predict how an overall formula will behave on skin.

Since lauric acid is the dominant fatty acid, this ingredient may not be fungal acne safe. The Malassezia yeast feeds on fatty acids with carbon chain lengths between 11-24, and lauric acid falls within these lengths (C12).

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.

Glycol Distearate is an emulsifier and emollient that adds a "pearly" appearance to formulations.

That lustrous look you see in many shampoos is due to this ingredient: when cooled, it crystallizes into small platelets that reflect light to give products that rich, shimmering look.

This ingredient is considered safe at present practices of use and concentration and repeated insult patch test with 50% Glycol Distearate on 125 subjects found no evidence of skin irritation, hypersensitivity, or acute toxicity.

Typical use concentrations range from 0.1-10%.

Because it's an ester of stearic acid, it falls into the range that Malassezia likes to metabolize. This ingredient may not be fungal acne safe.

This ingredient is derived from guar gum. It is a skin conditioning agent that creates a thin, breathable film to reduce water loss during cleansing.

This leaves the skin feeling soft rather than stripped and also contributes to a creamier lather.

Due to the large molecule size, this ingredient is unlikely to penetrate skin.

Hydrolyzed pea protein has skin conditioning and emollient properties. It is created by cutting protein fragments (peptides) into smaller pieces.

According to a manufacturer, this size of this ingredient makes it easy to be absorbed into skin where they strengthen the skin barrier, improve moisture retention, and improve signs of irritation.

One study that included pea proteins in a topical product reported improved atopic dermatitis symptom scores while a patent containing this ingredient suggests this ingredient to support hydration-related pathways in the skin.

Laureth-4 is created by reacting ethylene oxide with Lauryl Alcohol. It is a surfactant and emulsifier.

Surfactants reduce the surface tension of ingredients so they can mix better. Emulsifiers prevent ingredients such as oil and water from separating.

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.

Sodium C14-16 Olefin Sulfonate is a surfactant that helps water and oil mix so that dirt, sweat, sebum, and sunscreen can rinse away easily. It's not technically a sulfate, but behaves similarly in formulas.

What it does:

Sodium C14-16 Olefin Sulfonate is a strong cleansing surfactant and is much stronger than many mild cleansers. Because it works deeply, it can disrupt the skin's barrier. This can lead to dryness or irritation for those with sensitive skin.

Compared to gentler surfactants, it's effective but more likely to dry or irritate if not balanced with soothing ingredients.

CIR considers sodium α-olefin sulfonates (including C14-16) to be safe for use in rinse-off products when properly formulated. It is poorly absorbed through normal skin but absorption increases if the skin barrier is already damaged.

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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