Peter Thomas Roth Water Drench® Hyaluronic Glow Serum Versus La Roche-Posay Hydraphase HA Rich Hyaluronic Acid Face Cream
This hydrating serum is formulated around Sodium Hyaluronate and Lactic Acid to hydrate skin and brighten dull-looking skin.
This barrier-repair moisturizer is formulated around Butyrospermum Parkii Butter and Sodium Hyaluronate to strengthen the skin barrier and hydrate skin.
What's inside
What's inside
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningRicinus Communis Seed Oil
Masking
Butylene Glycol
Humectant
Isostearyl Neopentanoate
Emollient
Glycerin
Humectant
Sodium Hyaluronate
Humectant
Lactic Acid
Buffering
Sphingolipids
Emollient
Acrylates/C10-30 Alkyl Acrylate Crosspolymer
Emulsion StabilisingAmylopectin
Phospholipids
Skin Conditioning
Carbomer
Emulsion StabilisingPotassium Sorbate
Preservative
Ethylhexylglycerin
Skin ConditioningSodium Hydroxide
BufferingAscorbyl Palmitate
Antioxidant
Tocopherol
Antioxidant
Lecithin
Emollient
Sodium Benzoate
Masking
Malachite Extract
Antioxidant
Lithothamnion Calcareum Extract
Skin ConditioningSodium Citrate
BufferingPentylene Glycol
Skin Conditioning
Isostearyl Alcohol
Emollient
Xanthan Gum
EmulsifyingHydrogenated Palm Glycerides Citrate
Emollient
Dimethicone
Emollient
CI 42090
Cosmetic ColorantPhenoxyethanol
Preservative
Water, Ricinus Communis Seed Oil, Butylene Glycol, Isostearyl Neopentanoate, Glycerin, Sodium Hyaluronate, Lactic Acid, Sphingolipids, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Amylopectin, Phospholipids, Carbomer, Potassium Sorbate, Ethylhexylglycerin, Sodium Hydroxide, Ascorbyl Palmitate, Tocopherol, Lecithin, Sodium Benzoate, Malachite Extract, Lithothamnion Calcareum Extract, Sodium Citrate, Pentylene Glycol, Isostearyl Alcohol, Xanthan Gum, Hydrogenated Palm Glycerides Citrate, Dimethicone, CI 42090, Phenoxyethanol
Water
Skin ConditioningGlycerin
Humectant
Isopropyl Palmitate
Emollient
Butyrospermum Parkii Butter
Skin Conditioning
Lauroyl Lysine
Skin Conditioning
Cetyl Alcohol
Emollient
Urea
Buffering
PEG-100 Stearate
Surfactant
Glyceryl Stearate
Emollient
Cera Alba
Emollient
Pentylene Glycol
Skin Conditioning
Stearic Acid
Cleansing
Carbomer
Emulsion StabilisingGlyceryl Acrylate/Acrylic Acid Copolymer
HumectantSodium Hyaluronate
Humectant
Sodium Hydroxide
BufferingMyristic Acid
Cleansing
Palmitic Acid
Emollient
Hydrolyzed Hyaluronic Acid
Humectant
Caprylyl Glycol
Emollient
Citric Acid
Buffering
Trisodium Ethylenediamine Disuccinate
Xanthan Gum
EmulsifyingPolysorbate 60
Emulsifying
Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate
Antioxidant
Chlorphenesin
Antimicrobial
Parfum
Masking
Water, Glycerin, Isopropyl Palmitate, Butyrospermum Parkii Butter, Lauroyl Lysine, Cetyl Alcohol, Urea, PEG-100 Stearate, Glyceryl Stearate, Cera Alba, Pentylene Glycol, Stearic Acid, Carbomer, Glyceryl Acrylate/Acrylic Acid Copolymer, Sodium Hyaluronate, Sodium Hydroxide, Myristic Acid, Palmitic Acid, Hydrolyzed Hyaluronic Acid, Caprylyl Glycol, Citric Acid, Trisodium Ethylenediamine Disuccinate, Xanthan Gum, Polysorbate 60, Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate, Chlorphenesin, Parfum
Reviews
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Carbomer is a synthetic thickening and gelling agent. It's basically the ingredient that gives a lot of serums, gels, creams, and sunscreens their smooth, non-sticky texture.
Although legally permitted at very high levels, carbomers are normally used at concentrations below 1%.
It also needs to be neutralized to actually thicken, and because it is a large molecule, it doesn't really penetrate the skin barrier.
Allergy-wise, the risk is very low. Clinical studies show carbomers have low potential for skin irritation/sensitization even at concentrations up to 100%.
A 2024 UK study patch-tested 1,302 patients and found true allergy to the parent group of carbomer to be rare with no confirmed relevant reactions.
Learn more about CarbomerGlycerin (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 HyaluronateSodium 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.
Learn more about Sodium HydroxideWater. 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 WaterXanthan gum is used as a stabilizer and thickener within cosmetic products. It helps give products a sticky, thick feeling - preventing them from being too runny.
On the technical side of things, xanthan gum is a polysaccharide - a combination consisting of multiple sugar molecules bonded together.
Xanthan gum is a pretty common and great ingredient. It is a natural, non-toxic, non-irritating ingredient that is also commonly used in food products.
Learn more about Xanthan Gum
