Sulwhasoo First Care Activating Serum Versus Kiehl's Ultra Pure High-Potency 1.5% Hyaluronic Acid Serum
This hydrating serum is formulated around Glycyrrhiza Uralensis Root Extract and Camellia Sinensis Leaf Extract to hydrate skin.
This hydrating serum is formulated around Sodium Hyaluronate to hydrate skin and strengthen the skin barrier.
What's inside
What's inside
Key Ingredients
Benefits
Concerns
No concerns
Ingredients Side-by-side
Water
Skin ConditioningButylene Glycol
Humectant
Alcohol
Antimicrobial
Glycerin
Humectant
Betaine
Humectant
PEG/PPG-17/6 Copolymer
SolventGlyceryl Polymethacrylate
Ophiopogon Japonicus Root Extract
Skin ConditioningPhenoxyethanol
Preservative
Bis-PEG-18 Methyl Ether Dimethyl Silane
EmollientPEG-60 Hydrogenated Castor Oil
Emulsifying
Carbomer
Emulsion StabilisingTromethamine
BufferingGlycyrrhiza Uralensis Root Extract
Skin Conditioning
Parfum
Masking
Honey
Humectant
Juglans Regia Seed Extract
Skin ConditioningTheobroma Cacao Extract
Skin ConditioningDextrin
AbsorbentLilium Candidum Bulb Extract
Skin ConditioningPaeonia Albiflora Root Extract
Skin ConditioningRehmannia Glutinosa Root Extract
Skin ConditioningPolygonatum Officinale Rhizome/Root Extract
Skin ConditioningNelumbo Nucifera Flower Extract
Skin ConditioningXanthan Gum
EmulsifyingEthylhexylglycerin
Skin ConditioningPortulaca Oleracea Extract
Skin Conditioning
Limonene
Perfuming
Camellia Sinensis Leaf Extract
Antimicrobial
Disodium EDTA
ChelatingPhenyl Trimethicone
Skin Conditioning
Chondrus Crispus
Masking
Linalool
Perfuming
Biosaccharide Gum-1
Humectant
Ziziphus Jujuba Fruit Extract
Skin ConditioningNatto Gum
Citronellol
Perfuming
Citral
Perfuming
Propylene Glycol
Humectant
Geraniol
Perfuming
Chlorphenesin
Antimicrobial
Hydrogenated Lecithin
Emulsifying
BHT
Antioxidant
Sodium Dehydroacetate
Preservative
Potassium Sorbate
Preservative
Citric Acid
Buffering
Sorbic Acid
Preservative
Tocopherol
Antioxidant
Water, Butylene Glycol, Alcohol, Glycerin, Betaine, PEG/PPG-17/6 Copolymer, Glyceryl Polymethacrylate, Ophiopogon Japonicus Root Extract, Phenoxyethanol, Bis-PEG-18 Methyl Ether Dimethyl Silane, PEG-60 Hydrogenated Castor Oil, Carbomer, Tromethamine, Glycyrrhiza Uralensis Root Extract, Parfum, Honey, Juglans Regia Seed Extract, Theobroma Cacao Extract, Dextrin, Lilium Candidum Bulb Extract, Paeonia Albiflora Root Extract, Rehmannia Glutinosa Root Extract, Polygonatum Officinale Rhizome/Root Extract, Nelumbo Nucifera Flower Extract, Xanthan Gum, Ethylhexylglycerin, Portulaca Oleracea Extract, Limonene, Camellia Sinensis Leaf Extract, Disodium EDTA, Phenyl Trimethicone, Chondrus Crispus, Linalool, Biosaccharide Gum-1, Ziziphus Jujuba Fruit Extract, Natto Gum, Citronellol, Citral, Propylene Glycol, Geraniol, Chlorphenesin, Hydrogenated Lecithin, BHT, Sodium Dehydroacetate, Potassium Sorbate, Citric Acid, Sorbic Acid, Tocopherol
Reviews
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Chlorphenesin is a synthetic preservative. It helps protect a product against bacteria in order to extend shelf life. In most cases, Chlorphenesin is paired with other preservatives such as phenoxyethanol and caprylyl glycol.
Chlorphenesin is a biocide. This means it is able to help fight the microorganisms on our skin. It is also able to fight odor-releasing bacteria.
Chlorphenesin is soluble in both water and glycerin.
Studies show Chlorphenesin is easily absorbed by our skin. You should speak with a skincare professional if you have concerns about using Chlorphenesin.
Learn more about ChlorphenesinCitric 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.
Learn more about Citric AcidGlycerin (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 GlycerinPhenoxyethanol 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.
Learn more about PhenoxyethanolWater. 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
