Kiehl's Nightly Refining Micro-Peel Concentrate Versus La Roche-Posay Effaclar Ultra Concentrated Serum
Updated on July 18, 2023
Overview
What they are
These products are both reef safe . They have a total of 6 ingredients in common
Cool Features
They both contain AHA and exfoliants
Suited For
They're both likely to be good for brightening skin, oily skin, reducing pores, scar healing and better texture
Free From
They both do not contain any common allergens, parabens, silicones or sulfates
What's Inside
They both contain harsh alcohols and oils
We independently verify ingredients, and our claims are backed by peer-reviewed research. Spot a product that needs an update? Let us know.
Ingredient Info
Kiehl's Nightly Refining Micro-Peel Concentrate 26 ingredients
La Roche-Posay Effaclar Ultra Concentrated Serum 19 ingredients
About this product
About this product
At a glance
Click on any of the items below to learn more
Kiehl's Nightly Refining Micro-Peel Concentrate 26 ingredients
La Roche-Posay Effaclar Ultra Concentrated Serum 19 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningAlcohol Denat.
Antimicrobial
Hydroxyethylpiperazine Ethane Sulfonic Acid
BufferingHydroxyethyl Urea
HumectantSodium Citrate
BufferingVaccinium Myrtillus Fruit Extract
Skin ConditioningSodium Hydroxide
BufferingChenopodium Quinoa Seed Extract
Skin ConditioningSaccharum Officinarum Extract
MoisturisingGlycerin
Humectant
Propanediol
SolventPhytic Acid
Carrageenan
Phenoxyethanol
Preservative
Citrus Aurantium Dulcis Peel Oil
Masking
Citrus Limon Fruit Extract
Masking
Disodium EDTA
Acer Saccharum Extract
Skin ConditioningHydrolyzed Opuntia Ficus-Indica Flower Extract
Abrasive
Potassium Sorbate
Preservative
Aloe Barbadensis Leaf Juice Powder
Skin ConditioningAdenosine
Skin Conditioning
Ethylhexylglycerin
Skin ConditioningCitrus Aurantium Dulcis Fruit Extract
MaskingSodium Benzoate
Masking
Ascorbyl Glucoside
Antioxidant
Water, Alcohol Denat., Hydroxyethylpiperazine Ethane Sulfonic Acid, Hydroxyethyl Urea, Sodium Citrate, Vaccinium Myrtillus Fruit Extract, Sodium Hydroxide, Chenopodium Quinoa Seed Extract, Saccharum Officinarum Extract, Glycerin, Propanediol, Phytic Acid, Carrageenan, Phenoxyethanol, Citrus Aurantium Dulcis Peel Oil, Citrus Limon Fruit Extract, Disodium EDTA, Acer Saccharum Extract, Hydrolyzed Opuntia Ficus-Indica Flower Extract, Potassium Sorbate, Aloe Barbadensis Leaf Juice Powder, Adenosine, Ethylhexylglycerin, Citrus Aurantium Dulcis Fruit Extract, Sodium Benzoate, Ascorbyl Glucoside
Water
Skin ConditioningAlcohol Denat.
Antimicrobial
Propanediol
SolventGlycolic Acid
Buffering
Niacinamide
Smoothing
Dimethyl Isosorbide
SolventPentylene Glycol
Skin ConditioningSalicylic Acid
Masking
Sodium Hydroxide
BufferingPEG-60 Hydrogenated Castor Oil
Emulsifying
Hydroxyethylpiperazine Ethane Sulfonic Acid
BufferingCitric Acid
Buffering
PEG-30 Glyceryl Cocoate
Emulsifying
Capryloyl Salicylic Acid
Exfoliating
Biosaccharide Gum-1
Skin ConditioningMaltodextrin
AbsorbentPhytic Acid
Polyquaternium-10
Parfum
Masking
Water, Alcohol Denat., Propanediol, Glycolic Acid, Niacinamide, Dimethyl Isosorbide, Pentylene Glycol, Salicylic Acid, Sodium Hydroxide, PEG-60 Hydrogenated Castor Oil, Hydroxyethylpiperazine Ethane Sulfonic Acid, Citric Acid, PEG-30 Glyceryl Cocoate, Capryloyl Salicylic Acid, Biosaccharide Gum-1, Maltodextrin, Phytic Acid, Polyquaternium-10, Parfum
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
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. Stay hydrated!
Learn more about WaterAlcohol Denat. is an alcohol with a denaturant property. It is created by mixing ethanol with other additives.
This ingredient gets a bad rep because it is irritating and drying - mostly due to its astringent property. Astringents draw out natural oils in tissue, constricting pores and leaving your skin dried out.
However, alcohol denat. is not all that bad.
Due to its low molecular weight, alcohol denat. tends to evaporate quickly. One study on pig skin found half of applied alcohol evaporated in 10 seconds and less than 3% stayed on skin.
This also helps other ingredients become better absorbed upon application.
Studies are conflicted about whether this ingredient causes skin dehydration. One study from 2005 found adding emollients to propanol-based sanitizer decreased skin dryness and irritation. Another study found irritation only occurs if your skin is already damaged.
Small amounts of alcohol are generally tolerated by oily skin or people who live in humid environments.
The rule of thumb is if this alcohol is near the end of an ingredients list, it will probably not affect your skin much.
Also...
This ingredient has antimicrobial and solvent properties.
The antimicrobial property helps preserve products and increase their shelf life. As a solvent, it helps dissolve other ingredients.
Other types of astringent alcohols include:
Learn more about Alcohol Denat.We don't have a description for Hydroxyethylpiperazine Ethane Sulfonic Acid yet.
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.
Learn more about Sodium HydroxidePropanediol 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.
Learn more about PropanediolPhytic Acid is a gentle AHA and antioxidant. AHAs are chemical exfoliants that help remove dead skin cells. Phytic Acid has a slight and mild exfoliating effect.
The chemical makeup makes it classified as an AHA, much like lactic acid.
In some cases, it is a chelating agent. Chelating agents help prevent metals from binding to water, helping to stabilize the ingredients in a product.
An interesting fact about phytic acid is that it is considered an antinutrient. People do not have the enzyme needed to properly breakdown and digest phytic acid. When ingested, phytic acid binds to minerals and prevents them from being absorbed.
Read more about some other popular AHA's here:
Learn more about Phytic AcidIngredient Ratings
Here's what our community thinks of the ingredients in these products.
When to use
Kiehl's Nightly Refining Micro-Peel Concentrate 26 ingredients
La Roche-Posay Effaclar Ultra Concentrated Serum 19 ingredients
Reviews
Here's what our community thinks
Kiehl's Nightly Refining Micro-Peel Concentrate 26 ingredients
La Roche-Posay Effaclar Ultra Concentrated Serum 19 ingredients
This product was horrible for me! First I got it recommended by a pharmacist for my face, but back then it was too tingly and I stopped using it. Now because I’ve gotten a bit bacne I would use it there. Apparently I might be allergic, and now I have to throw it out for good! I don’t know who’s face can tolerate this concentrated serum :/
Worth the try for ACNE skin
I used it for about 2 years and I was more than satisfied. Upon returning on my Erasmus trip, it broke me out and made my skin dry. I don't know if anything happened during the trip but right now I don't use it. It's really good if you have taken acne treatment pills and you need smt to keep the acne away (from my experience at least).
