Skin science article
Olehenriksen Banana Bright+ Eye Crème Versus Paula's Choice C5 Super Boost Eye Cream
Olehenriksen Banana Bright+ Eye Crème Versus Paula's Choice C5 Super Boost Eye Cream This brightening eye moisturizer is formulated around 3-O-Ethyl Ascorbic Acid and Simmondsia Chinensis Seed Oil to brighten dull-looking skin and hydrate skin. This brightenin
Olehenriksen Banana Bright+ Eye Crème Versus Paula's Choice C5 Super Boost Eye Cream
This brightening eye moisturizer is formulated around 3-O-Ethyl Ascorbic Acid and Simmondsia Chinensis Seed Oil to brighten dull-looking skin and hydrate skin.
This brightening eye moisturizer is formulated around Ascorbyl Glucoside and 3-O-Ethyl Ascorbic Acid to brighten dull-looking skin and soften the look of wrinkles.
What's inside
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Simmondsia Chinensis Seed Oil
Butyrospermum Parkii Butter
Isododecane
Coconut Alkanes
3-O-Ethyl Ascorbic Acid
Cetearyl Alcohol
Glycerin
C18-38 Alkyl Hydroxystearoyl Stearate
Dilinoleic Acid/Propanediol Copolymer
Polymethylsilsesquioxane
Cocoyl Proline
Dimethicone Crosspolymer
Pentaerythrityl Tetraisostearate
Tetrahexyldecyl Ascorbate
Ascorbic Acid
Gold
Glutathione
Citrus Nobilis Fruit Extract
Citrus Paradisi Peel Extract
Glucosyl Hesperidin
Tocopherol
Tamarindus Indica Seed Polysaccharide
Poncirus Trifoliata Fruit Extract
Morus Alba Root Extract
Linoleic Acid
Linolenic Acid
Jojoba Esters
Caprylyl Glycol
Coco-Caprylate/Caprate
Propanediol
Polyglyceryl-3 Cocoate
Polyglyceryl-4 Caprate
Polyglyceryl-6 Caprylate
Polyglyceryl-6 Ricinoleate
Hdi/Trimethylol Hexyllactone Crosspolymer
Polyacrylate-13
Butylene Glycol
Polyglyceryl-3 Stearate
Polysorbate 20
Sodium Citrate
Polyisobutene
Beheneth-5
Acrylates/C10-30 Alkyl Acrylate Crosspolymer
Behenyl Alcohol
Sodium Hydroxide
Sorbic Acid
Sorbitan Isostearate
Citric Acid
Hydrolyzed Vegetable Protein
Stearic Acid
Palmitic Acid
Oleic Acid
Sorbitol
Silica
Sodium Benzoate
1,2-Hexanediol
Xanthan Gum
Phenoxyethanol
Leuconostoc/Radish Root Ferment Filtrate
Mica
Titanium Dioxide
CI 77891
CI 77491
Water, Simmondsia Chinensis Seed Oil, Butyrospermum Parkii Butter, Isododecane, Coconut Alkanes, 3-O-Ethyl Ascorbic Acid, Cetearyl Alcohol, Glycerin, C18-38 Alkyl Hydroxystearoyl Stearate, Dilinoleic Acid/Propanediol Copolymer, Polymethylsilsesquioxane, Cocoyl Proline, Dimethicone Crosspolymer, Pentaerythrityl Tetraisostearate, Tetrahexyldecyl Ascorbate, Ascorbic Acid, Gold, Glutathione, Citrus Nobilis Fruit Extract, Citrus Paradisi Peel Extract, Glucosyl Hesperidin, Tocopherol, Tamarindus Indica Seed Polysaccharide, Poncirus Trifoliata Fruit Extract, Morus Alba Root Extract, Linoleic Acid, Linolenic Acid, Jojoba Esters, Caprylyl Glycol, Coco-Caprylate/Caprate, Propanediol, Polyglyceryl-3 Cocoate, Polyglyceryl-4 Caprate, Polyglyceryl-6 Caprylate, Polyglyceryl-6 Ricinoleate, Hdi/Trimethylol Hexyllactone Crosspolymer, Polyacrylate-13, Butylene Glycol, Polyglyceryl-3 Stearate, Polysorbate 20, Sodium Citrate, Polyisobutene, Beheneth-5, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Behenyl Alcohol, Sodium Hydroxide, Sorbic Acid, Sorbitan Isostearate, Citric Acid, Hydrolyzed Vegetable Protein, Stearic Acid, Palmitic Acid, Oleic Acid, Sorbitol, Silica, Sodium Benzoate, 1,2-Hexanediol, Xanthan Gum, Phenoxyethanol, Leuconostoc/Radish Root Ferment Filtrate, Mica, Titanium Dioxide, CI 77891, CI 77491
Dicaprylyl Carbonate
Triheptanoin
Ascorbyl Glucoside
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Arachidyl Alcohol
C13-15 Alkane
Ascorbyl Palmitate
Sh-Polypeptide-121
Acetyl Hexapeptide-8
Hyaluronic Acid
Zerumbone
Bacillus Ferment
Tocopheryl Acetate
Butyrospermum Parkii Butter Unsaponifiables
Oryza Sativa Bran Extract
Rosmarinus Officinalis Leaf Extract
Helianthus Annuus Seed Oil
Helianthus Annuus Seed Extract
Hydrogenated Lecithin
Cetearyl Olivate
Sorbitan Olivate
Arachidyl Glucoside
Cetyl Alcohol
Sodium Phytate
Sodium Metabisulfite
Ethylhexylglycerin
Hexylene Glycol
Water, Dicaprylyl Carbonate, Glycerin, Triheptanoin, Ascorbyl Glucoside, 3-O-Ethyl Ascorbic Acid, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Arachidyl Alcohol, Cetearyl Alcohol, C13-15 Alkane, Ascorbyl Palmitate, Sh-Polypeptide-121, Acetyl Hexapeptide-8, Hyaluronic Acid, Zerumbone, Bacillus Ferment, Tocopherol, Tocopheryl Acetate, Butyrospermum Parkii Butter Unsaponifiables, Oryza Sativa Bran Extract, Rosmarinus Officinalis Leaf Extract, Helianthus Annuus Seed Oil, Helianthus Annuus Seed Extract, Hydrogenated Lecithin, Cetearyl Olivate, Sorbitan Olivate, Behenyl Alcohol, Arachidyl Glucoside, Propanediol, Butylene Glycol, Cetyl Alcohol, Sodium Phytate, Sodium Citrate, Citric Acid, Sodium Metabisulfite, Phenoxyethanol, Caprylyl Glycol, Ethylhexylglycerin, Hexylene Glycol, Sodium Hydroxide
Reviews
Alternatives
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
3-O-Ethyl Ascorbic Acid is one of the most popular "stable" vitamin C derivatives in skincare.
Plain ascorbic acid is fantastic but notoriously fragile; it browns, oxidizes, and loses potency fast. So attaching an ethyl group to the third carbon of the molecule gives it some cool perks:
In a formula, it does the 3 classic vitamin C jobs: it acts as an antioxidant, helps brighten skin tone by inhibiting tyrosinase, and supports collagen.
The evidence is reasonably solid for a cosmetic ingredient; Liao and colleagues (2018) showed it's significantly more stable than ascorbic acid while still being effective.
A 2021 study by Zerbinati and colleagues tested a serum with 30% 3-O-ethyl-l-ascorbic acid and 1% lactic acid significantly increased collagen production, reduced UVB-induced DNA damage, and decreased melanin on a reconstructed pigmented skin model.
Typical real world usage sits around 0.5-5% (and 1-2% is common for daily serums).
Amounts up to 30% have been shown to be non-irritating on human skin samples, but two isolated cases reported allergic contact dermatitis so a patch test is sensible if you have reactive skin.
Behenyl Alcohol is a type of fatty alcohol (these are different from the drying, solvent alcohols).
Fatty Alcohols have hydrating properties and are most often used as an emollient or to thicken a product. They are usually derived from natural fats and oils; behenyl alcohol is derived from the fats of vegetable oils.
Emollients help keep your skin soft and hydrated by creating a film that traps moisture in.
In 2000, Behenyl Alcohol was approved by the US as medicine to reduce the duration of cold sores.
Butylene Glycol (or BG) is used within cosmetic products for a few different reasons:
Overall, Butylene Glycol is a safe and well-rounded ingredient that works well with other ingredients.
Though this ingredient works well with most skin types, some people with sensitive skin may experience a reaction such as allergic rashes, closed comedones, or itchiness.
Caprylyl Glycol is a humectant, skin conditioner, emollient, and preservative booster derived from either caprylic acid or synthetically created.
Typical use levels vary from 0.3-1% as a preservative booster and go up to 2% to condition skin.
Because it is not a free-fatty acid, this ingredient is fungal acne safe (there's nothing for Malassezia to feed on).
Cetearyl alcohol is a waxy mixture of two fatty alcohols: cetyl alcohol and stearyl alcohol. It is an emollient and emulsifier.
Despite having "alcohol" in its name, it has nothing to do with drying solvent alcohols; the FDA also allows "alcohol-free" products to contain fatty alcohols like this ingredient.
It plays several roles in a formula:
Typical use levels for this ingredient sit around 1-10% and the Cosmetic Ingredient Review Expert Panel has affirmed safety at concentrations up to 25% in leave-on products.
Multiple assessments have found it to be non-irritating and non-sensitizing to most people.
However, there have been some cases of allergic contact dermatitis in patients with chronically compromised skin barriers.
Cetearyl alcohol has a comedogenic rating of 2 and irritancy rating of 1. Both of these numbers come from the 1989 study that used rabbit ears; a "2" means mildly comedogenic and a "1" means low irritancy.
Here's the catch: rabbit skin is more sensitive than human skin and throws a lot of false positives. A 1996 reappraisal found that ingredients rated 1-2 in the rabbit ear tests are generally safe for humans.
Remember comedogenic ratings are unable to assess the entire formula of a product or how it will react on your skin. Just be sure to patch test if you are unsure about certain ingredients.
This ingredient is not fungal acne safe. Cetearyl alcohol is a fatty alcohol with chain lengths that fall within the range that Malassezia can metabolize.
A 2019 study has also observed Malassezia growth in the presence of this ingredient, confirming it to be not-fungal acne safe.
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.
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.
Phenoxyethanol is one of the most widely used preservatives in skincare (and for good reason!).
It has a large spectrum of antimicrobial activity and especially effective bacteria, yeast, and mold while only having a weak effect on your skin's natural microbiome.
On a cellular level, it disrupts the cell membranes of microbes by poking holes that make the cell leak. This shuts down the chemical reactions the microbe needs to make energy so it can no longer survive.
Another perk of this ingredient is that it stays functional across a wide pH range (3-10).
You'll often see it paired with boosters like Ethylhexylglycerin; one study showed that a 1:9 ratio of Ethylhexylglycerin to Phenoxyethanol damages bacterial membranes as effectively as doubling the Phenoxyethanol concentration on its own.
Typical use concentrations range from 0.3-1% depending on the formula, and this ingredient is capped at 1% int the EU.
Safety-wise, the fear mongering does not hold up to the evidence. The EU's Scientific Committee on Consumer Safety and FDA consider it safe as a preservative at up to 1%, including for children of all ages.
Adverse systemic effects only showed up in animal studies at exposures roughly 200x higher than what people get from cosmetics. And despite its very widespread use, this ingredient is a rare sensitizer and allergic reactions are uncommon.
Propanediol is an all-star ingredient. It softens, hydrates, and smooths the skin.
It’s often used to:
Propanediol is not likely to cause sensitivity and considered safe to use. It is derived from corn or petroleum with a clear color and no scent.
Sodium Citrate is the sodium salts of citric acid. In skincare, it is used to alter pH levels and acts as a preservative.
Its main functions are to maintain the pH of a product and neutralize metal ions.
The acidity of our skin is maintained by our glands and skin biome; normal pH level of skin is slightly acidic (~4.75-5.5).
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 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.
In small amounts, sodium hydroxide is considered safe to use. However, large amounts may cause chemical burns due to its high alkaline.
Your skin has a natural pH and acid mantle. This acid mantle helps prevent harmful bacteria from breaking through. The acid mantle also helps keep your skin hydrated.
"Alkaline" refers to a high pH level. A low pH level would be considered acidic.
Tocopherol is a fat-soluble antioxidant known as Vitamin E.
You'll find this ingredient in the vast majority of skincare (for good reason). It works to neutralize free radicals, or unstable molecules generated by UV exposure, pollution, and other environmental stressors, before they can cause oxidative damage to your skin cells.
Topically applied tocopherol has been shown to protect against UV damage by ramping up the skin's own natural defense enzymes.
It also acts as a skin conditioning agent; some studies show that regular topical use can improve the skin's water-binding capacity over 2-4 weeks.
This ingredient is especially loved for being a team player. When combined with Vitamin C, the photoprotective effect of both ingredients roughly doubles and the combo also helps reduce UV-induced DNA damage.
This ingredient has some brightening potential but it's more of a prevention ingredient than spot-fader. Cell studies show it can slow down melanin production but it's worth noting that it's not the most powerful brightener out there.
In formulations, it also serves as a stabilizer that helps protect other oxidation-prone ingredients from degrading.
Concentrations usually range from 0.1-1% in most leave-on products.
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!