Stella by Stella McCartney Alter-Care Serum Versus Paula's Choice Clinical 0.3% Retinol + 2% Bakuchiol Treatment
This hydrating serum is formulated around Squalane and Sodium Hyaluronate to hydrate skin and strengthen the skin barrier.
This anti-aging treatment is formulated around Bakuchiol and Tetrahexyldecyl Ascorbate to soften the look of wrinkles and refine skin texture.
What's inside
What's inside
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningGlycerin
Humectant
Propanediol
Solvent
Squalane
Emollient
Caprylic/Capric Triglyceride
Masking
Pentylene Glycol
Skin Conditioning
Polyglycerin-3
Humectant
Maris Aqua
HumectantSodium Hyaluronate
Humectant
Vaccinium Vitis-Idaea Fruit Extract
Antioxidant
Crithmum Maritimum Extract
Skin ConditioningPalmaria Palmata Extract
Skin ProtectingHydrogenated Vegetable Oil
Emollient
Tocopheryl Acetate
Antioxidant
Tocopherol
Antioxidant
Jojoba Esters
Emollient
Xanthan Gum
EmulsifyingHydrogenated Coco-Glycerides
Emollient
Hydroxyacetophenone
Antioxidant
Cetearyl Glucoside
Emulsifying
Sodium Stearoyl Glutamate
CleansingAlcaligenes Polysaccharides
EmollientCitric Acid
Buffering
Sodium Citrate
BufferingGluconolactone
Skin Conditioning
Glucose
Humectant
Calcium Gluconate
HumectantCaprylic/Capric/Succinic Triglyceride
EmollientCetearyl Alcohol
Emollient
Sodium Benzoate
Masking
Parfum
Masking
Water, Glycerin, Propanediol, Squalane, Caprylic/Capric Triglyceride, Pentylene Glycol, Polyglycerin-3, Maris Aqua, Sodium Hyaluronate, Vaccinium Vitis-Idaea Fruit Extract, Crithmum Maritimum Extract, Palmaria Palmata Extract, Hydrogenated Vegetable Oil, Tocopheryl Acetate, Tocopherol, Jojoba Esters, Xanthan Gum, Hydrogenated Coco-Glycerides, Hydroxyacetophenone, Cetearyl Glucoside, Sodium Stearoyl Glutamate, Alcaligenes Polysaccharides, Citric Acid, Sodium Citrate, Gluconolactone, Glucose, Calcium Gluconate, Caprylic/Capric/Succinic Triglyceride, Cetearyl Alcohol, Sodium Benzoate, Parfum
Water
Skin ConditioningDimethicone
Emollient
Pentaerythrityl Tetraisostearate
Emollient
Isononyl Isononanoate
EmollientButylene Glycol
Humectant
Bakuchiol
Antimicrobial
Arachidyl Alcohol
Emollient
Glyceryl Polymethacrylate
Dimethicone Crosspolymer
Emulsion Stabilising
Behenyl Alcohol
Emollient
Glycerin
Humectant
PEG-75 Shea Butter Glycerides
Emulsifying
Glyceryl Stearate
Emollient
C12-15 Alkyl Benzoate
AntimicrobialPolysorbate 20
Emulsifying
Tetrahexyldecyl Ascorbate
Antioxidant
Retinol
Skin Conditioning
Ceramide Ng
Skin Conditioning
Palmitoyl Tetrapeptide-7
Skin Conditioning
Palmitoyl Hexapeptide-12
Skin Conditioning
Sodium Hyaluronate
Humectant
Dipotassium Glycyrrhizate
Humectant
Glycyrrhiza Glabra Root Extract
Bleaching
Avena Sativa Kernel Extract
Abrasive
Arctium Lappa Root Extract
Skin Conditioning
Salix Alba Bark Extract
Astringent
Glycine Soja Sterols
Emollient
Lecithin
Emollient
Allantoin
Skin Conditioning
Tocopheryl Acetate
Antioxidant
Hydrolyzed Soy Protein
Humectant
Palmitoyl Tripeptide-1
Skin Conditioning
Sodium Hydroxide
BufferingTribehenin
Emollient
Caprylyl Glycol
Emollient
Dipeptide-2
Skin Conditioning
Polygonum Cuspidatum Root Extract
Antioxidant
PEG-10 Phytosterol
EmulsifyingPEG-8
HumectantMagnesium Aluminum Silicate
Absorbent
Arachidyl Glucoside
EmulsifyingChrysin
Skin ConditioningPentylene Glycol
Skin Conditioning
Sodium Acrylates Copolymer
Steareth-20
CleansingHydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Emulsion StabilisingCetearyl Alcohol
Emollient
Coco-Glucoside
Cleansing
Hesperidin Methyl Chalcone
Antioxidant
N-Hydroxysuccinimide
Skin ConditioningDisodium EDTA
Phenoxyethanol
Preservative
Benzoic Acid
Masking
Ethylhexylglycerin
Skin ConditioningWater, Dimethicone, Pentaerythrityl Tetraisostearate, Isononyl Isononanoate, Butylene Glycol, Bakuchiol, Arachidyl Alcohol, Glyceryl Polymethacrylate, Dimethicone Crosspolymer, Behenyl Alcohol, Glycerin, PEG-75 Shea Butter Glycerides, Glyceryl Stearate, C12-15 Alkyl Benzoate, Polysorbate 20, Tetrahexyldecyl Ascorbate, Retinol, Ceramide Ng, Palmitoyl Tetrapeptide-7, Palmitoyl Hexapeptide-12, Sodium Hyaluronate, Dipotassium Glycyrrhizate, Glycyrrhiza Glabra Root Extract, Avena Sativa Kernel Extract, Arctium Lappa Root Extract, Salix Alba Bark Extract, Glycine Soja Sterols, Lecithin, Allantoin, Tocopheryl Acetate, Hydrolyzed Soy Protein, Palmitoyl Tripeptide-1, Sodium Hydroxide, Tribehenin, Caprylyl Glycol, Dipeptide-2, Polygonum Cuspidatum Root Extract, PEG-10 Phytosterol, PEG-8, Magnesium Aluminum Silicate, Arachidyl Glucoside, Chrysin, Pentylene Glycol, Sodium Acrylates Copolymer, Steareth-20, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Cetearyl Alcohol, Coco-Glucoside, Hesperidin Methyl Chalcone, N-Hydroxysuccinimide, Disodium EDTA, Phenoxyethanol, Benzoic Acid, Ethylhexylglycerin
Reviews
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
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.
Learn more about Cetearyl AlcoholGlycerin (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.
Learn more about GlycerinPentylene Glycol (1,2-pentanediol) is a multitasking little diol with three main roles in a formula:
Research on alkanediols (the family pentylene glycol belongs to) show they work by disrupting microbial cell membranes. This disruption helps the primary preservative system in a product work more effectively at lower doses.
On the safety side, the Cosmetic Ingredient Review Expert Panel has concluded this ingredient to be safe as used in current cosmetic practices + concentrations.
Typical use levels in a formula run about 1-5%.
Learn more about Pentylene GlycolSodium Hyaluronate is the salt form of hyaluronic acid. It is a long sugar chain that is naturally found in your skin, joints, and connective tissue that maintains hydration and elasticity.
In skincare, it works as a humectant. It pulls water from the environment and deeper layers of skin and binds it to the surface.
Interestingly, the size of the molecule affects its behavior:
Some clinical evidence links low molecular weight versions to improved wrinkle depth, elasticity, anti-inflammatory effects, and barrier repair.
Many serums use a blend of both weights so you can get surface hydration plus longer-lasting and deeper effects.
You'll typically see concentrations between 0.1-2% for this ingredient.
Learn more about Sodium HyaluronateTocopheryl Acetate is a stable, shelf-friendly form of vitamin E.
Formulators love it because plain vitamin E oxidizes quickly once it hits air. This acetate version stays stable and resists going off, helping to extend a product's shelf life.
It's actually inactive on its own and works like a slow-release "storage" form; the enzymes in your skin called esterases gradually convert it into active vitamin E over time.
One in vivo study showed 5% of the acetate in the living layer of the epidermis converted to vitamin E after 5 days of application. This study also found the skin gained protection against UV damage even though the conversion was slow and small.
Once converted, vitamin E acts as a skin's main fat-soluble antioxidant that fights free radicals to protect skin from damage.
Topical vitamin E generally boosts the skin's photoprotection, and it reduced UV-damage in animal models.
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.
Overall, it has a pretty solid safety profile and has been found to be non-irritating and non-comedogenic. Allergic reactions may happen but stay rare due to how widely the ingredient gets used.
The concentration will vary depending on the formula; industry data shows 0.1% in baby lotions, 3% in lipsticks, and 5% in foot powders. You can also find this ingredient at 100% in a pure vitamin E oil.
Most leave-on skincare keeps it at the lower end, often between 0.5-1%.
Learn more about Tocopheryl AcetateWater. 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
