Skin science article
Necessaire The Body Retinol Versus Paula's Choice Skin Revealing Body Lotion 10% AHA
Necessaire The Body Retinol Versus Paula's Choice Skin Revealing Body Lotion 10% AHA What's inside Key Ingredients Benefits Concerns Ingredients Side-by-side Water Glycolic Acid Mandelic Acid Rosa Damascena Flower Water Caprylic/Capric Triglyceride Glycerin Ce
Necessaire The Body Retinol Versus Paula's Choice Skin Revealing Body Lotion 10% AHA
What's inside
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Glycolic Acid
Mandelic Acid
Rosa Damascena Flower Water
Caprylic/Capric Triglyceride
Glycerin
Cetearyl Alcohol
Sodium Hydroxide
Coconut Alkanes
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
1,2-Hexanediol
Cetearyl Olivate
Sorbitan Olivate
Propanediol
Silica
Silica Silylate
Magnesium Stearate
Niacinamide
Retinol
Sh-Oligopeptide-1
Sh-Oligopeptide-2
Sh-Polypeptide-1
Sh-Polypeptide-9
Sh-Polypeptide-11
Tocopherol
Tetrahexyldecyl Ascorbate
Bacillus/Folic Acid Ferment Filtrate Extract
Cellulose Acetate Butyrate
C13-14 Alkane
C15-23 Alkane
Tricaprylin
Acetyl Glutamine
Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate
Lecithin
Citric Acid
Hippophae Rhamnoides Fruit Oil
Coco-Caprylate/Caprate
Decyl Glucoside
Sodium Hyaluronate
Caprylyl Glycol
Sodium Benzoate
Potassium Sorbate
Sodium Carbonate
Sodium Chloride
Ethylhexylglycerin
Hydroxyacetophenone
Citronellol
Geraniol
Water, Glycolic Acid, Mandelic Acid, Rosa Damascena Flower Water, Caprylic/Capric Triglyceride, Glycerin, Cetearyl Alcohol, Sodium Hydroxide, Coconut Alkanes, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, 1,2-Hexanediol, Cetearyl Olivate, Sorbitan Olivate, Propanediol, Silica, Silica Silylate, Magnesium Stearate, Niacinamide, Retinol, Sh-Oligopeptide-1, Sh-Oligopeptide-2, Sh-Polypeptide-1, Sh-Polypeptide-9, Sh-Polypeptide-11, Tocopherol, Tetrahexyldecyl Ascorbate, Bacillus/Folic Acid Ferment Filtrate Extract, Cellulose Acetate Butyrate, C13-14 Alkane, C15-23 Alkane, Tricaprylin, Acetyl Glutamine, Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate, Lecithin, Citric Acid, Hippophae Rhamnoides Fruit Oil, Coco-Caprylate/Caprate, Decyl Glucoside, Sodium Hyaluronate, Caprylyl Glycol, Sodium Benzoate, Potassium Sorbate, Sodium Carbonate, Sodium Chloride, Ethylhexylglycerin, Hydroxyacetophenone, Citronellol, Geraniol
Cyclopentasiloxane
Dimethicone
Glyceryl Stearate
Stearic Acid
Cetyl Alcohol
Butyrospermum Parkii Butter
PEG-100 Stearate
Tocopheryl Acetate
Chamomilla Recutita Flower Extract
Vitis Vinifera Seed Oil
Camellia Oleifera Leaf Extract
Epilobium Angustifolium Extract
Allantoin
Butylene Glycol
Xanthan Gum
Disodium EDTA
Phenoxyethanol
Water, Glycolic Acid, Cyclopentasiloxane, Dimethicone, Glycerin, Glyceryl Stearate, Stearic Acid, Cetyl Alcohol, Butyrospermum Parkii Butter, Sodium Hydroxide, PEG-100 Stearate, Tetrahexyldecyl Ascorbate, Tocopheryl Acetate, Chamomilla Recutita Flower Extract, Vitis Vinifera Seed Oil, Camellia Oleifera Leaf Extract, Epilobium Angustifolium Extract, Allantoin, Butylene Glycol, Xanthan Gum, Disodium EDTA, Sodium Benzoate, Phenoxyethanol
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.
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.
Glycolic Acid is arguably the most famous alpha hydroxy acid (AHA) with tons of research backing its benefits.
It is found naturally in sugar cane but the form used in skincare is usually synthetic for purity and stability.
Glycolic acid removes the top layer of dead skin cells to allow newer and fresher ones to emerge.
AHAs work by breaking down the structural “glue” that holds old skin cells in place. When that buildup is gone, your skin can renew itself more efficiently.
Research also shows glycolic acid stimulates collagen production, helping to firm and thicken the skin over time. This is one of its biggest advantages over other AHAs.
Overall, glycolic acid helps with:
Fun fact: Glycolic acid boosts skin hydration by helping it produce molecules that increase hyaluronic acid naturally.
To work best, glycolic acid products should have a pH between 3-4 (that’s where exfoliation is most effective but still gentle on skin).
The pH and concentration of a product are key to its effectiveness:
It is normal to feel a slight stinging sensation when using glycolic acid. This usually fades as your skin adjusts.
Because glycolic acid has the smallest molecular size in the AHA family, it can penetrate deeper, which enhances its effectiveness but also makes it more likely to irritate sensitive skin.
If your skin is very sensitive or prone to rosacea, glycolic acid may be too strong; in that case, try milder options like lactic acid or a PHA instead.
Recent studies suggest glycolic acid might even help protect against UV damage. But don’t skip sunscreen! Freshly exfoliated skin is more sensitive to the sun.
Glycolic acid is a skincare superstar. It smooths, brightens, hydrates, and firms the skin. Unless you’re highly sensitive, it’s well worth adding to your routine.
Read more about some other popular AHA's here:
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.
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.
Tetrahexyldecyl Ascorbate (THD) is a stable and oil-soluble form of Vitamin C.
THD is special in that it has the ability to travel deeper into skin than traditional ascorbic acid while maintaining the same skin benefits (double win!).
Because it’s oil-soluble, THD dives deep into your skin’s fatty layers (think ceramides and cholesterol) to fight off the kind of free radicals that mess with your skin barrier. This makes it a great pair with water-based vitamin C (ascorbic acid) that mainly works on the surface.
Even at just 0.1%, THD is already showing great antioxidant activity. When used up to 2%, it helps keep your skin happy and calm, especially when it’s stressed from pollution or sun.
Want to fade dark spots or tackle hyperpigmentation? You’ll want 5% or more. Pairing it with brightening buddies like niacinamide or licorice root gives even better results. One study even used 30% THD with other brighteners and saw real results on stubborn discoloration, even in melasma-prone skin.
A note on THD: It’s has a slightly silky, oily texture and usually shows up colorless or pale yellow (though the exact shade can vary by supplier).
While you can sneak it into water-based formulas, it really shines when paired with silicones or oils, which help your skin soak it up better.
THD is pretty stable, but it’s still vulnerable to degradation like ascorbic acid. Too much light or heat (above 113°F / 45°C) can break it down over time. Go for dark and opaque packaging that keeps it safe and shady!
Read more about other types of Vitamin C:
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!