Kevin Murphy Young Again Leave-In Treatment Oil Versus Olaplex Nº.9 Bond Protector Nourishing Hair Serum
What's inside
What's inside
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Cyclopentasiloxane
Emollient
Dimethicone
Emollient
Dimethiconol
Emollient
Bis-Cetearyl Amodimethicone
Helichrysum Stoechas Flower Extract
Perfuming
Pyrus Malus Fruit Extract
Skin Conditioning
Saccharum Officinarum Extract
MoisturisingCamellia Sinensis Leaf Extract
Antimicrobial
Carthamus Tinctorius Seed Oil
Masking
Citrus Limon Peel Oil
Masking
Citrus Limon Fruit Extract
Masking
Vitis Vinifera Seed Extract
Antimicrobial
Ginkgo Biloba Leaf Extract
Skin Conditioning
Glycerin
Humectant
Hydrolyzed Soy Protein
Humectant
Water
Skin ConditioningHexylene Glycol
EmulsifyingButylene Glycol
Humectant
Cyclohexasiloxane
Emollient
Betaine
Humectant
Vanillyl Butyl Ether
MaskingBehentrimonium Chloride
Preservative
Quaternium-91
Myristyl Myristate
Emollient
Hexapeptide-11
Skin Conditioning
Cetearyl Alcohol
Emollient
Ethylhexyl Methoxycinnamate
UV Absorber
BHT
Antioxidant
Phenoxyethanol
Preservative
Potassium Sorbate
Preservative
Sodium Benzoate
Masking
Parfum
Masking
Linalool
Perfuming
Limonene
Perfuming
Geraniol
Perfuming
CI 60725
Cosmetic ColorantCyclopentasiloxane, Dimethicone, Dimethiconol, Bis-Cetearyl Amodimethicone, Helichrysum Stoechas Flower Extract, Pyrus Malus Fruit Extract, Saccharum Officinarum Extract, Camellia Sinensis Leaf Extract, Carthamus Tinctorius Seed Oil, Citrus Limon Peel Oil, Citrus Limon Fruit Extract, Vitis Vinifera Seed Extract, Ginkgo Biloba Leaf Extract, Glycerin, Hydrolyzed Soy Protein, Water, Hexylene Glycol, Butylene Glycol, Cyclohexasiloxane, Betaine, Vanillyl Butyl Ether, Behentrimonium Chloride, Quaternium-91, Myristyl Myristate, Hexapeptide-11, Cetearyl Alcohol, Ethylhexyl Methoxycinnamate, BHT, Phenoxyethanol, Potassium Sorbate, Sodium Benzoate, Parfum, Linalool, Limonene, Geraniol, CI 60725
Water
Skin ConditioningPropanediol
Solvent
Betaine
Humectant
Quaternium-22
Bis-Aminopropyl Diglycol Dimaleate
Skin ConditioningSodium Hyaluronate
Humectant
Cetrimonium Chloride
Antimicrobial
Panthenol
Skin Conditioning
Hydroxyethylcellulose
Emulsion StabilisingPvp
Emulsion StabilisingGuar Hydroxypropyltrimonium Chloride
Skin ConditioningFurcellaria Lumbricalis Extract
Skin ConditioningPelvetia Canaliculata Extract
Skin ProtectingXylitylglucoside
Humectant
Polyquaternium-44
Anhydroxylitol
Humectant
Maltitol
HumectantCitric Acid
Buffering
Trisodium Ethylenediamine Disuccinate
Xylitol
Humectant
Ethylhexylglycerin
Skin ConditioningSodium Hydroxide
BufferingSorbic Acid
Preservative
Phenoxyethanol
Preservative
Sodium Benzoate
Masking
Parfum
Masking
Citral
Perfuming
Citronellol
Perfuming
Hexyl Cinnamal
Perfuming
Limonene
Perfuming
Linalool
Perfuming
Water, Propanediol, Betaine, Quaternium-22, Bis-Aminopropyl Diglycol Dimaleate, Sodium Hyaluronate, Cetrimonium Chloride, Panthenol, Hydroxyethylcellulose, Pvp, Guar Hydroxypropyltrimonium Chloride, Furcellaria Lumbricalis Extract, Pelvetia Canaliculata Extract, Xylitylglucoside, Polyquaternium-44, Anhydroxylitol, Maltitol, Citric Acid, Trisodium Ethylenediamine Disuccinate, Xylitol, Ethylhexylglycerin, Sodium Hydroxide, Sorbic Acid, Phenoxyethanol, Sodium Benzoate, Parfum, Citral, Citronellol, Hexyl Cinnamal, Limonene, Linalool
Reviews
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Betaine is a humectant. Like hyaluronic acid, it helps attract and retain moisture in the skin. It’s known for being gentle and for helping the skin maintain balanced hydration.
Betaine is mainly used to improve hydration and support calmer skin. It helps skin cells regulate water balance because it functions as an osmolyte.
Some studies suggest betaine may support making skin tone more even.
Fun fact: Betaine naturally exists in the skin and the body. In cosmetic products, it can be either plant-derived (most commonly from sugar beets) or synthetically produced for consistency and stability.
Betaine is also known as trimethylglycine.
Learn more about BetaineLimonene 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.
Learn more about LimoneneLinalool is a fragrance and helps add scent to products. It's derived from common plants such as cinnamon, mint, citrus, and lavender.
Like Limonene, this ingredient oxidizes when exposed to air. Oxidized linalool can cause allergies and skin sensitivity.
This ingredient has a scent that is floral, spicy tropical, and citrus-like.
Learn more about LinaloolParfum 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.
Learn more about ParfumPhenoxyethanol is a preservative that has germicide, antimicrobial, and aromatic properties. Studies show that phenoxyethanol can prevent microbial growth. By itself, it has a scent that is similar to that of a rose.
It's often used in formulations along with Caprylyl Glycol to preserve the shelf life of products.
Sodium Benzoate is a preservative. It's used in both cosmetic and food products to inhibit the growth of mold and bacteria. It is typically produced synthetically.
Both the US FDA and EU Health Committee have approved the use of sodium benzoate. In the US, levels of 0.1% (of the total product) are allowed.
Sodium benzoate works as a preservative by inhibiting the growth of bacteria inside of cells. It prevents the cell from fermenting a type of sugar using an enzyme called phosphofructokinase.
It is the salt of benzoic acid. Foods containing sodium benzoate include soda, salad dressings, condiments, fruit juices, wines, and snack foods.
Studies for using ascorbic acid and sodium benzoate in cosmetics are lacking, especially in skincare routines with multiple steps.
We always recommend speaking with a professional, such as a dermatologist, if you have any concerns.
Learn more about Sodium BenzoateWater. 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!
Learn more about Water
