Overview
What they are
These products are both cruelty-free . They have a total of 3 ingredients in common
Suited For
They're both likely to be good for dry skin, brightening skin, sensitive skin and scar healing
Free From
They both do not contain any harsh alcohols, parabens or sulfates
What's Inside
They both contain common allergens and fragrances
We independently verify ingredients, and our claims are backed by peer-reviewed research. Spot a product that needs an update? Let us know.
Ingredient Info
K18 Hair PEPTIDE PREP™ Clarifying Detox Shampoo 18 ingredients
Ouai Hair Oil 45 ingredients
- Prunus Amygdalus Dulcis Oil
- Simmondsia Chinensis Seed Oil
- Jojoba Esters
- Butyrospermum Parkii Butter
- Helianthus Annuus Seed Oil
- Oryza Sativa Bran Oil
- Adansonia Digitata Seed Oil
- Borago Officinalis Seed Oil
- Crambe Abyssinica Seed Oil
- Glycine Soja Oil
- Passiflora Edulis Seed Oil
- Moringa Oleifera Seed Oil
- Coconut Alkanes
- Coco-Caprylate/Caprate
- Hydrogenated Olive Oil Unsaponifiables
At a glance
Click on any of the items below to learn more
K18 Hair PEPTIDE PREP™ Clarifying Detox Shampoo 18 ingredients
Ouai Hair Oil 45 ingredients
Notable Ingredients
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Concerns
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Notable Ingredients
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Benefits
This product contains 4 ingredients that may have this attribute:
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Concerns
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Ingredients Side-by-side
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.
Sodium C14-16 Olefin Sulfonate is a cleansing agent made from a mixture of long chain sulfonate salts. It can also help produce foam.
Cocamidopropyl Hydroxysultaine is a synthetic cleansing agent, though it is derived from coconut oil.
Preservative 5 Benefits 4 Concerns
Salicylic Acid (also known as beta hydroxy acid or BHA) is one of the most well-known ingredients for treating skin that struggles with blackheads and acne. It helps to exfoliate both the skin's surface and pores, and also acts as an anti-inflammatory agent.
Panthenol is a common ingredient that helps hydrate and soothe the skin. It can be found naturally in our skin and hair.
Glycerin is already naturally found in your skin. It helps moisturize and protect your skin.
Sodium Phytate is the synthetic salt form of phytic acid. Phytic acid is an antioxidant and can be found in plant seeds.
Caprylyl Glycol is a humectant and emollient, meaning it attracts and preserves moisture.
4 Benefits 2 Concerns
Citric Acid is an AHA derived from citrus fruits (think oranges, lemons, and limes!).
Potassium hydroxide is commonly known as caustic potash. It is used to fix the pH of a product or as a cleaning agent in soap. In cleansers, it is used for the saponification of oils.
Sodium Hydroxide is also known as lye or caustic soda. It is used to adjust the pH of products; many ingredients require a specific pH to be effective.
2 Concerns
Parfum is a catch-all term for an ingredient or more that is used to give a scent to products.
EU Allergen
Benzyl Salicylate is a solvent and fragrance additive. It is an ester of benzyl alcohol and salicylic acid. This ingredient can be naturally found in some plants and plant extracts.
Limonene is a fragrance that adds scent and taste to a formulation.
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
Cyclopentasiloxane is a silicone used to improve texture and trap moisture. An easier name for this is D5.
Dimethicone is a silicone used for making products smooth and silky. It also has the added benefit of sealing in hydration. The amount of dimethicone found in beauty products is considered safe and non-comedogenic, meaning it won't clog pores.
Not safe for Fungal Acne
Prunus Amygdalus Dulcis Oil comes from the sweet almond, a tree native to Iran. This oil has no fragrance and is non-volatile.
C12-15 Alkyl Benzoate is made up of Benzoic Acid and long chain alcohols. It has a low molecular weight.
Phenyl Trimethicone is a silicon-based polymer. It is derived from silica.
Helps hydrate Dry Skin Not safe for Fungal Acne
This ingredient is the fixed oil extracted from seeds of the desert shrub Jojoba. It is more commonly known as jojoba oil. The seed oil is liquid wax ester from the plant. It is non-comedogenic.
Dimethiconol is a silicone that resembles the popular dimethicone. Like other silicones, it is an emollient. Emollients create a thin film on skin to prevent moisture from escaping.
Jojoba Esters is a wax created from Jojoba oil. It is an emollient and film-forming ingredient. In bead form, it is an exfoliator.
2 Concerns
Butyrospermum Parkii Butter is a plant lipid from the fruit of the Shea Tree. It is an effective skin hydrator and emollient.
Helps hydrate Dry Skin 2 Concerns
Helianthus Annuus Seed Oil is the oil derived from the seeds of a Sunflower. Sunflower seed oil is non-fragrant. It is an emollient, meaning it helps to soften the skin.
Not safe for Fungal Acne
Oryza Sativa Bran Oil comes from the outer layer of a rice kernel. It is a byproduct of milling rice, or the operation to produce a whole grain rice product.
Not safe for Fungal Acne
Adansonia Digitata Seed Oil is an oil and isn't fungal acne safe.
Helps reduce irritation Not safe for Fungal Acne
Borago Officinalis Seed Oil is from the seeds of the starflower plant. This plant grows primarily in Europe.
Not safe for Fungal Acne
Crambe Abyssinica Seed Oil is an oil and isn't fungal acne safe.
Not safe for Fungal Acne
Glycine Soja Oil comes from the soybean. Glycine Soja is native to eastern Asia.
Not safe for Fungal Acne
Passiflora Edulis Seed Oil is an oil and isn't fungal acne safe.
Not safe for Fungal Acne
Moringa Oleifera Seed Oil is the oil expressed from the seeds of Moringa oleifera plant. It is more commonly known as Moringa seed oil.
Coconut Alkanes is created from the fatty-acids of coconut oil. It is volatile, meaning it evaporates from the skin.
Oryza Sativa Bran Extract comes from the outer layer of a rice kernel. It is a byproduct of milling rice, or the operation to produce a whole grain rice product.
Daucus Carota Sativa Root Extract comes from the root commonly known as carrot (the orange kind we eat!).
Rosmarinus Officinalis Leaf Extract comes from rosemary. Rosemary is native to the Mediterranean.
Antioxidant 4 Benefits May cause irritation
Tocopherol (also known as Vitamin E) is a common antioxidant used to help protect the skin from free-radicals and strengthen the skin barrier. It's also fat soluble - this means our skin is great at absorbing it.
Coco-Caprylate/Caprate is created from fatty coconut alcohol, caprylic acid, and capric acid.
2 Concerns
Ethylhexyl Methoxycinnamate is an organic compound that provides UVB protection. It often goes by the more common name of octinoxate. It is created from methoxycinnamic acid and 2-ethylhexanol.
Diisostearyl Malate is an emollient and most often used in lip products. It comes from isostearyl alcohol, a fatty acid, and malic acid, an AHA.
Not safe for Fungal Acne
Hydrogenated Olive Oil Unsaponifiables is an oil and isn't fungal acne safe.
Beta-Carotene is a carotenoid. It is an antioxidant that converts to Vitamin A. Antioxidants help fight free-radicals. Free-radicals are molecules that may damage your skin cells, such as pollution.
This BHA stands for butylated hydroxyanisole. If you are looking for the beta-hydroxy acid, aka as Salicylic Acid, click here.
4 Benefits 2 Concerns
Citric Acid is an AHA derived from citrus fruits (think oranges, lemons, and limes!).
May worsen Eczema
Benzoic Acid is used to preserve and adjust the pH of products.
Phenoxyethanol is a preservative that has germicide, antimicrobial, and aromatic properties. Studies show that phenoxyethanol can prevent germ and microbial growth. By itself, it has a scent that is similar to that of a rose.
2 Concerns
Parfum is a catch-all term for an ingredient or more that is used to give a scent to products.
EU Allergen
Benzyl Benzoate is usually created from the condensation of benzoic acid and benzyl alcohol. It is used as a preservative, solvent, and has a floral/balsamic scent in large amounts.
EU Allergen
Citronellol is used to add fragrance/parfum to a product. It is often derived from plants such as roses. In fact, it can be found in many essential oils including geranium, lavender, neroli, and more. The scent of Citronellol is often described as "fresh, grassy, and citrus-like".
EU Allergen
Benzyl Salicylate is a solvent and fragrance additive. It is an ester of benzyl alcohol and salicylic acid. This ingredient can be naturally found in some plants and plant extracts.
2 Concerns
Linalool is a fragrance and helps add scent to products. It's derived from common plants such as cinnamon, mint, citrus, and lavender.
EU Allergen
Hydroxycitronellal is a fragrance created from citronellal. The smell of hydroxycitronellal is often described as "citrus-like" or "melon-like".
EU Allergen
Hexyl Cinnamal is a fragrance ingredient with a similar scent to jasmine. It can be naturally found in chamomile essential oil.
EU Allergen
Geraniol is used to add fragrance/parfum to a product. It is the main component of citronellol. It is a monoterpenoid and an alcohol.
Cyclopentasiloxane, Dimethicone, Prunus Amygdalus Dulcis Oil, Isododecane, Hydrogenated Ethylhexyl Olivate, C12-15 Alkyl Benzoate, Phenyl Trimethicone, Simmondsia Chinensis Seed Oil, Dimethiconol, Jojoba Esters, Butyrospermum Parkii Butter, Helianthus Annuus Seed Oil, Oryza Sativa Bran Oil, Adansonia Digitata Seed Oil, Borago Officinalis Seed Oil, Crambe Abyssinica Seed Oil, Glycine Soja Oil, Passiflora Edulis Seed Oil, Moringa Oleifera Seed Oil, Coconut Alkanes, Kaempferia Galanga Root Extract, Helianthus Annuus Extract, Amaranthus Caudatus Seed Extract, Oryza Sativa Bran Extract, Daucus Carota Sativa Root Extract, Rosmarinus Officinalis Leaf Extract, Tocopherol, Coco-Caprylate/Caprate, Ethylhexyl Methoxycinnamate, Polysilicone-15, Diisostearyl Malate, Hydrogenated Olive Oil Unsaponifiables, Beta-Carotene, BHA, Citric Acid, Benzoic Acid, Phenoxyethanol, Parfum, Benzyl Benzoate, Citronellol, Benzyl Salicylate, Linalool, Hydroxycitronellal, Hexyl Cinnamal, Geraniol
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 AHA derived from citrus fruits (think oranges, lemons, and limes!).
As an AHA, Citric Acid removes the top layer of skin cells from the newer layer of skin underneath. This helps skin to remove dark spots and even out skin tone.
If you spot Citric Acid near the end of an ingredient list, it's likely there as a pH adjuster rather than an active ingredient.
Read more about some other popular AHA's here:
Learn more about Citric AcidParfum 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.
In the US, the alternative name for parfum is 'fragrance'.
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 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.
Learn more about ParfumBenzyl Salicylate is a solvent and fragrance additive. It is an ester of benzyl alcohol and salicylic acid. This ingredient can be naturally found in some plants and plant extracts.
In fragrances, Benzyl Salicylate may be a solvent or a fragrance component. In synthetic musk scents, it is used as a solvent. For floral fragrances such as lilac and jasmine, it is used as a fragrance component. The natural scent of Benzyl Salicylate is described as "lightly-sweet, slightly balsamic".
While Benzyl Salicylate has been associated with contact dermatitis and allergies, emerging studies show it may not be caused by this ingredient alone.
However, this ingredient is often used with fragrances and other components that may cause allergies. It is still listed as a known allergen in the EU. We recommend speaking with a professional if you have concerns.
Another study from 2021 shows Benzyl Salicylate may have anti-inflammatory properties.
Learn more about Benzyl SalicylateIngredient Ratings
Here's what our community thinks of the ingredients in these two products.
When to use
K18 Hair PEPTIDE PREP™ Clarifying Detox Shampoo 18 ingredients
Ouai Hair Oil 45 ingredients
Reviews
Here's what our community thinks
K18 Hair PEPTIDE PREP™ Clarifying Detox Shampoo 18 ingredients
starstellastar_407
There are some clear pros and cons here.
Pros
•good for oily scalp.
•gets rid off excess sebum
•doesn't clog pores
Cons
•bottle is made...
There are some clear pros and cons here.
Pros
•good for oily scalp.
•gets rid off excess sebum
•doesn't clog pores
Cons
•bottle is made out of very hard plastic that makes squeezing out product super hard.
•dries the ends
•mega expensive, especially for 250ml
•getting the product spread through the scalp is very tough without using a lot of it. Using a different shampoo first is necessary for me
