Overview
What they are
These products are both reef safe eye moisturizers. They have a total of 15 ingredients in common
Cool Features
They both contain hyaluronic acid, peptides and Vitamin C
Suited For
They're both likely to be good for anti aging, dry skin, brightening skin, scar healing, dark spots and better texture
Free From
They both do not contain any harsh alcohols, common allergens, oils or parabens
What's Inside
They both contain silicones
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
Kiehl's Powerful-Strength Dark Circle Reducing Vitamin C Eye Serum 26 ingredients
ISDIN K-Ox Eyes 35 ingredients
At a glance
Click on any of the items below to learn more
Kiehl's Powerful-Strength Dark Circle Reducing Vitamin C Eye Serum 26 ingredients
ISDIN K-Ox Eyes 35 ingredients
Notable Ingredients
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Benefits
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Concerns
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Notable Ingredients
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Concerns
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Ingredients Side-by-side
Propylene Glycol is an odorless, colorless liquid. As a humectant, it helps skin retain moisture. It also aids in delivering active ingredients.
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.
Glycerin is already naturally found in your skin. It helps moisturize and protect your skin.
Antioxidant 6 Benefits
Ascorbic Acid is is pure Vitamin C. This form makes up the largest amount of vitamin C found naturally in our skin.
Dimethicone Crosspolymer is a silicone created by modifying dimethicone with hydrocarbon side chains. Due to its large size, it does not penetrate skin. It is considered non-occlusive.
This ingredient is a high molecular weight silicone. It has emulsifying and skin conditioning properties.
Cyclohexasiloxane is a type of silicone more commonly known as D6. It is an emollient and solvent.
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.
This ingredient comes from a fatty acid (lauric acid) and amino acid (lysine). It is used to add a silky feel to cosmetics.
Aluminum Starch Octenylsuccinate is a synthetic powder used as an absorbent, thickener, and anti-caking agent.
Ci 77891 is a white pigment from Titanium dioxide. It is naturally found in minerals such as rutile and ilmenite.
Adenosine is in every living organism. It is one of four components in nucleic acids that helps store our DNA.
Hydrolyzed Hyaluronic Acid is a form of hyaluronic acid. It is created by the hydrolysis of hyaluronic acid with a high molecular weight. Once created, Hydrolyzed Hyaluronic Acid has a low molecular weight.
Steareth-20 is a waxy compound used to emulsify ingredients. It is created from stearyl alcohol.
Sodium Citrate is the sodium salts of citric acid. In skincare, it is used to alter pH levels and acts as a preservative.
Potassium Sorbate is a preservative used to prevent yeast and mold in products. It is commonly found in both cosmetic and food products.
Not safe for Fungal Acne
Palmitoyl Tripeptide-1 is a 3-amino acid peptide. Peptides are building blocks for protein.
Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate (long name, huh?) is a synthetic antioxidant.
Not safe for Fungal Acne
Palmitoyl Tetrapeptide-7 is a peptide. Peptides are building blocks for protein.
4 Benefits 2 Concerns
Citric Acid is an AHA derived from citrus fruits (think oranges, lemons, and limes!).
Biotin is a B vitamin that is naturally produced by our bodies. It is also called Vitamin H.
Propylene Glycol, Dimethicone, Glycerin, Ascorbic Acid, Dimethicone Crosspolymer, Cetyl Peg/Ppg-10/1 Dimethicone, Cyclohexasiloxane, Water, Hydroxyethylpiperazine Ethane Sulfonic Acid, Lauroyl Lysine, Aluminum Starch Octenylsuccinate, Polysilicone-11, CI 77891, Adenosine, Hydrolyzed Hyaluronic Acid, Steareth-20, Chlorhexidine Digluconate, N-Hydroxysuccinimide, Sodium Citrate, Potassium Sorbate, Palmitoyl Tripeptide-1, Chrysin, Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate, Palmitoyl Tetrapeptide-7, Citric Acid, Biotin
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.
Glycerin is already naturally found in your skin. It helps moisturize and protect your skin.
Isohexadecane is added to enhance texture, emulsify, and to help cleanse. It is an isoparrafin. It is a component of petrolatum.
Isopropyl Myristate is an emollient, thickening agent, and texture enhancer. It is created from isopropyl alcohol and myristic acid.
Peg-30 Dipolyhydroxystearate isn't fungal acne safe.
Magnesium Sulfate is a salt. It can be naturally found in sea water or mineral deposits.
Phenoxyethanol 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.
2 Concerns
Parfum is a catch-all term for an ingredient or more that is used to give a scent to products.
Cera Microcristallina isn't fungal acne safe.
Ci 77891 is a white pigment from Titanium dioxide. It is naturally found in minerals such as rutile and ilmenite.
We don't have a description for Acrylates/C12-22 Alkyl Methacrylate Copolymer.
Steareth-20 is a waxy compound used to emulsify ingredients. It is created from stearyl alcohol.
Silicon
Hesperidin Methyl Chalcone is an antioxidant and is a type of silicone.
Disodium EDTA plays a role in making products more stable by aiding other preservatives.
Hydrolyzed Hyaluronic Acid is a form of hyaluronic acid. It is created by the hydrolysis of hyaluronic acid with a high molecular weight. Once created, Hydrolyzed Hyaluronic Acid has a low molecular weight.
Ethylhexylglycerin (we can't pronounce this either) is commonly used as a preservative and skin softener. It is derived from glyceryl.
Pentylene glycol is typically used within a product to thicken it. It also adds a smooth, soft, and moisturizing feel to the product. It is naturally found in plants such as sugar beets.
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.
BHT is a synthetic antioxidant. As an antioxidant, it helps your body fight off free-radicals. Free-radicals are molecules that may damage your skin cells.
Potassium Sorbate is a preservative used to prevent yeast and mold in products. It is commonly found in both cosmetic and food products.
Antioxidant 6 Benefits Not safe for Fungal Acne
Ascorbyl Palmitate is created by combining pure Vitamin C and palmitic acid. It is an antioxidant and helps reduce hyperpigmentation.
Not safe for Fungal Acne
Palmitoyl Tetrapeptide-7 is a peptide. Peptides are building blocks for protein.
4 Benefits 2 Concerns
Citric Acid is an AHA derived from citrus fruits (think oranges, lemons, and limes!).
Antioxidant 6 Benefits
Ascorbic Acid is is pure Vitamin C. This form makes up the largest amount of vitamin C found naturally in our skin.
Not safe for Fungal Acne
Palmitoyl Tripeptide-1 is a 3-amino acid peptide. Peptides are building blocks for protein.
Sodium Citrate is the sodium salts of citric acid. In skincare, it is used to alter pH levels and acts as a preservative.
Biotin is a B vitamin that is naturally produced by our bodies. It is also called Vitamin H.
Water, Glycerin, Isohexadecane, Isopropyl Myristate, Ppg-15 Stearyl Ether, Peg-30 Dipolyhydroxystearate, Phytonadione Epoxide, Magnesium Sulfate, Phenoxyethanol, Parfum, Cera Microcristallina, CI 77891, Sodium Dextran Sulfate, Acrylates/C12-22 Alkyl Methacrylate Copolymer, Steareth-20, Hesperidin Methyl Chalcone, Disodium EDTA, Hydrolyzed Hyaluronic Acid, Ethylhexylglycerin, Peg-8, Pentylene Glycol, Tocopherol, Chlorhexidine Digluconate, N-Hydroxysuccinimide, BHT, Potassium Sorbate, Dipeptide-2, Ascorbyl Palmitate, Palmitoyl Tetrapeptide-7, Citric Acid, Ascorbic Acid, Chrysin, Palmitoyl Tripeptide-1, Sodium Citrate, Biotin
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Glycerin is already naturally found in your skin. It helps moisturize and protect your skin.
A study from 2016 found glycerin to be more effective as a humectant than AHAs and hyaluronic acid.
As a humectant, it helps the skin stay hydrated by pulling moisture to your skin. The low molecular weight of glycerin allows it to pull moisture into the deeper layers of your skin.
Hydrated skin improves your skin barrier; Your skin barrier helps protect against irritants and bacteria.
Glycerin has also been found to have antimicrobial and antiviral properties. Due to these properties, glycerin is often used in wound and burn treatments.
In cosmetics, glycerin is usually derived from plants such as soybean or palm. However, it can also be sourced from animals, such as tallow or animal fat.
This ingredient is organic, colorless, odorless, and non-toxic.
Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.
Learn more about GlycerinAscorbic Acid is is pure Vitamin C. This form makes up the largest amount of vitamin C found naturally in our skin.
Not only is vitamin C great for your overall health and immune system, it also has plenty of benefits on your skin.
Vitamin C is best used for brightening skin. It improves dark spots, acne scars, and hyperpigmentation. This is because it blocks the process of skin darkening when exposed to UV.
Remember: Vitamin C should not replace sunscreen!
Your skin uses vitamin C to build collagen. Collagen is one key component in having a strong skin barrier and plump skin. Vitamin C also plays a role in regulating collagen, thus making it effective in improving wrinkles and fine lines.
Ascorbic acid shows potent antioxidant activity. As an antioxidant, it helps fight free-radicals. Free-radicals are molecules that may damage your skin cells. These antioxidants also protect skin against UV damage.
The best formulations include Vitamin E and/or ferulic acid. These two ingredients help stabilize and provide a boost in the benefits of ascorbic acid. This is because ascorbic acid becomes unstable when exposed to UV and air. In fact, you can tell your ascorbic acid has oxidized when it turns an orange-yellow color.
Ascorbic acid is generally compatible with other ingredients. However, using ascorbic acid with other active ingredients might cause irritation. Two ingredients: copper ions and benzoyl peroxide, will inactivate ascorbic acid completely.
Read more about other types of Vitamin C:
Foods rich with vitamin C include oranges, strawberries, broccoli, bell peppers, and more. When consuming Vitamin C, your skin receives a portion of the nutrients.
Learn more about Ascorbic AcidWater. 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. Stay hydrated!
Learn more about WaterCi 77891 is a white pigment from Titanium dioxide. It is naturally found in minerals such as rutile and ilmenite.
It's main function is to add a white color to cosmetics. It can also be mixed with other colors to create different shades.
Ci 77891 is commonly found in sunscreens due to its ability to block UV rays.
Learn more about CI 77891Hydrolyzed Hyaluronic Acid is a form of hyaluronic acid. It is created by the hydrolysis of hyaluronic acid with a high molecular weight. Once created, Hydrolyzed Hyaluronic Acid has a low molecular weight.
Low molecular weight HA has been shown to hydrate and increase elasticity of the skin. Increasing elasticity is also associated with reduction of wrinkle depth.
One study found topical low molecular weight hyaluronic acid may be considered for the treatment of rosacea in the adult population. However, we always recommend speaking with a professional about your skin concerns.
Hyaluronic acids are a humectant. This means they draw moisture from the air. Hyaluronic acids help moisturize, soothe, and protect the skin.
Read more about other common forms of hyaluronic acid:
Learn more about Hydrolyzed Hyaluronic AcidSteareth-20 is a waxy compound used to emulsify ingredients. It is created from stearyl alcohol.
It possesses surfactant properties. This means it reduces surface tension and helps oils, dirt, and pollutants to be washed away.
The 20 stands for the number of ethylene oxide used to create this ingredient.
Learn more about Steareth-20Chlorhexidine Digluconate is a preservative.
We don't have a description for N-Hydroxysuccinimide.
Sodium Citrate is the sodium salts of citric acid. In skincare, it is used to alter pH levels and acts as a preservative.
Sodium Citrate helps maintain the pH of a product. Normal pH level of skin is slightly acidic (~4.75-5.5). The acidity of our skin is maintained by our glands and skin biome. Being slightly acidic allows our skin to create an "acid mantle". This acid mantle is a thin barrier that protects our skin from bacteria and contaminants.
Sodium Citrate is a chelating agent. It neutralizes metal ions from water and prevents them from binding to other ingredients. This ensures the other ingredients will not be altered.
Learn more about Sodium CitratePotassium Sorbate is a preservative used to prevent yeast and mold in products. It is commonly found in both cosmetic and food products.
This ingredient comes from potassium salt derived from sorbic acid. Sorbic acid is a natural antibiotic and effective against fungus.
Both potassium sorbate and sorbic acid can be found in baked goods, cheeses, dried meats, dried fruit, ice cream, pickles, wine, yogurt, and more.
You'll often find this ingredient used with other preservatives.
Learn more about Potassium SorbatePalmitoyl Tripeptide-1 is a 3-amino acid peptide. Peptides are building blocks for protein.
Palmitoyl Tripeptide-1 is a signal peptide. This means it tells our skin to create collagen. Collagen is a protein that makes connective tissue. Boosting collagen production leads to a healthier skin barrier. Having a healthy skin barrier means having firm and hydrated skin.
Palmitoyl Tripeptide-1 can help reduce wrinkles and make the skin look more youthful.
Read more about other common types of peptides here:
Learn more about Palmitoyl Tripeptide-1We don't have a description for Chrysin.
Palmitoyl Tetrapeptide-7 is a peptide. Peptides are building blocks for protein.
This ingredient consists of four amino acids and palmitic acid. These amino acids are arginine, proline, glutamine, and glycine.
This ingredient has many benefits. These benefits include boosting collagen production, fighting inflammation, and reversing UV damage.
By preventing our bodies from producing interleukins, Palmitoyl Tetrapeptide-7 helps fight inflammation. An interleukin is a chemical that signals to the body to produce an inflammatory response. Interleukin production is accelerated by UV radiation.
Palmitoyl Tetrapeptide-7 tells our body to create more collagen. Collagen is a protein that makes connective tissue. Boosting collagen production leads to a healthier skin barrier. Having a healthy skin barrier means having firm and hydrated skin.
Read more about other common types of peptides here:
Learn more about Palmitoyl Tetrapeptide-7Citric 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 AcidBiotin is a B vitamin that is naturally produced by our bodies. It is also called Vitamin H.
Our bodies use biotin in the metabolism process. It also helps our bodies use enzymes and move nutrients around. A biotin deficiency can lead to brittle hair and nails.
More research is needed on applying biotin topically. However, taking biotin orally has been shown to help nourish the skin, hair, and nails. They play a role in forming skin-hydrating fatty acids.
Biotin is water-soluble. It can be found in foods such as fish, eggs, dairy, nuts, and meat. Vitamin H stands for "haar" and "haut". These are the German words for hair and skin.
We recommend speaking with a professional if you have any questions or concerns about this ingredient.
Learn more about BiotinIngredient Ratings
Here's what our community thinks of the ingredients in these two products.
When to use
Kiehl's Powerful-Strength Dark Circle Reducing Vitamin C Eye Serum 26 ingredients
ISDIN K-Ox Eyes 35 ingredients
Reviews
Here's what our community thinks
Kiehl's Powerful-Strength Dark Circle Reducing Vitamin C Eye Serum 26 ingredients
ISDIN K-Ox Eyes 35 ingredients
Valerija
Used it for over a year, but didn't see any results with regard to fine lines. It has a nice applicator and is both very hydrating & moisturizing....
Used it for over a year, but didn't see any results with regard to fine lines. It has a nice applicator and is both very hydrating & moisturizing. However, the fragrance is a bit too strong and it would occasionally irritate my eyes. I'd rate it 3.5 stars just because it is very hydrating (unfortunately, no halves on SkinSort).
