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La Roche-Posay Toleriane Kerium DS Moisturizer
La Roche-Posay

La Roche-Posay Toleriane Kerium DS Moisturizer

Efficacy75/100IrritancyMedium
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Works for

1 of 1 advertised claim delivered

Moisturizing
Zinc pca, Myristyl myristate + 7 more
Good evidence
What the product description says
“The latest innovation from La Roche-Posay Toleriane, Kerium DS is a facial moisturizer that soothes skin flakes, redness, and itchiness while providing 48-hour hydration.”
Source: Shoppers Drug Mart

This product can help improve hydration of the skin with the two types of ingredients.

The first type is called “humectants”:
these ingredients help attract water. When humectants are on the surface of the skin, they “pull in” the moisture from the outside environment, or from within deeper layers of the skin. The following ingredients in this product do the job: glycerin, zinc pca.

This product also contains ingredients called “occlusives”. They help reduce the speed with which our skin loses moisture to the outside environment. These ingredients also help soften the upper layer of the skin, so it feels less tight and nicer to the touch. The following ingredients in this product do the job: dimethicone, myristyl myristate.

Zinc pcaKey active· HumectantEffect: HighA compound that combines zinc with a hydrating ingredient PCA. Might to be helpful against acne and clogged pores. Can help calm down inflammation in skin. Could be helpful in reducing the formation of free radicals in skin. Might help to reduce fine lines in wrinkles, but solid evidence is missing~1–1.5%
Myristyl myristateKey active· Emollient, OcclusiveEffect: HighAn emollient. Is not recommended for acne-prone skin as it can be comedogenic~1.8–2.7%
GlycerinKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant~3.3–4.9%
DimethiconeKey active· Emollient, OcclusiveEffect: HighA silicone that helps to reduce water loss from the surface of the skin. Can temporarily "fill in" lines and wrinkles, absorb oil, and create a nice product finish~2.8–4.1%
Capryloyl glycineKey activeEffect: MediumHelps oil and water mix together, preserve cosmetic products, and attract water to the upper layer of the skin~0.35–0.8%
Glyceryl stearate seKey activeEffect: MediumUsed to stabilize the product formulations and works as an emollient~0.8–1.25%
Palmitic acid· EmollientEffect: LowAn emollient that is naturally present in skin and helps soften it~0.4–0.9%
Stearic acid· EmollientEffect: LowHelps oil and water mix together and works as an emollient~1.5–2.3%
Isononyl isononanoate· Emollient, OcclusiveEffect: LowForms a protective film on the surface of the skin to prevent moisture loss. Gives a velvety feel to products while reducing tackiness~4.6–7%

Can it cause trouble?

Irritancy
1 strong irritant: Parfum
Medium risk
We flagged 7 ingredients with irritancy potential. Severity depends on your sensitivity threshold; the table lists the worst offenders first.
IngredientFunctionIrritationEst. amount
ParfumAn aromatic blend of unspecified and possibly irritating ingredientsHigh~0.05–0.15%est.
Myristyl myristateAn emollient. Is not recommended for acne-prone skin as it can be comedogenicMedium~1.8–2.7%est.
Potassium cetyl phosphateHelps oil and water mix togetherMedium~1.3–1.9%est.
Myristic acidHelps oil and water mix together. Could be comedogenicMedium~0.45–1.05%est.
Disodium edtaStabilizes the product formulationMedium~0.2–0.8%est.
Citric acidCan work as an exfoliant but is typically used to adjust the product pHMedium~0.1–0.45%est.
Piroctone olamineA preservativeMedium~0.05–0.3%est.
Comedogenic
3 ingredients rated 2 or more on the 0–5 pore-clogging scale
3 flagged
These ingredients have a comedogenic rating of 2 or more on a 0–5 scale; the table shows each one's rating. In leave-on products they can clog pores in acne-prone skin.
IngredientFunctionRatingEst. amount
Myristyl myristateAn emollient. Is not recommended for acne-prone skin as it can be comedogenic3/5~1.8–2.7%est.
Myristic acidHelps oil and water mix together. Could be comedogenic3/5~0.45–1.05%est.
Glyceryl stearate seUsed to stabilize the product formulations and works as an emollient2/5~0.8–1.25%est.
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Ingredients

Filter by role to see what each ingredient is doing.

Water~40–60%
Formula
Irritation risk
Low

Plain old water

More about Water
Isononyl isononanoate~4.6–7%
Formula
Irritation risk
Low
Works for
Moisturizing

Forms a protective film on the surface of the skin to prevent moisture loss. Gives a velvety feel to products while reducing tackiness

More about Isononyl isononanoate
Glycerin~3.3–4.9%
Key active
Irritation risk
Low
Works for
Moisturizing

One of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant

More about Glycerin
Dimethicone~2.8–4.1%
Key active
Irritation risk
Low
Works for
MoisturizingMattifying

A silicone that helps to reduce water loss from the surface of the skin. Can temporarily "fill in" lines and wrinkles, absorb oil, and create a nice product finish

More about Dimethicone
Ammonium polyacryloyldimethyl taurate~2.1–3.1%
Formula
Irritation risk
Low

Used to create a thicker product consistency

More about Ammonium polyacryloyldimethyl taurate
Myristyl myristate~1.8–2.7%
Key activeComedogenic 3/5Irritant · medium
Irritation risk
Medium
Comedogenicity
3/5
Works for
Moisturizing

An emollient. Is not recommended for acne-prone skin as it can be comedogenic

More about Myristyl myristate
Stearic acid~1.5–2.3%
Formula
Irritation risk
Low
Works for
CleansingMoisturizing

Helps oil and water mix together and works as an emollient

More about Stearic acid
Potassium cetyl phosphate~1.3–1.9%
Irritant · medium
Irritation risk
Medium
Works for
Cleansing

Helps oil and water mix together

More about Potassium cetyl phosphate
Zinc pca~1–1.5%
Key active
Irritation risk
Low
Works for
MoisturizingAnti-inflammatoryAnti-blemishAnti-agingAnti-oxidation

A compound that combines zinc with a hydrating ingredient PCA. Might to be helpful against acne and clogged pores. Can help calm down inflammation in skin. Could be helpful in reducing the formation of free radicals in skin. Might help to reduce fine lines in wrinkles, but solid evidence is missing

More about Zinc pca
Glyceryl stearate se~0.8–1.25%
Key activeComedogenic 2/5
Irritation risk
Low
Comedogenicity
2/5
Works for
CleansingMoisturizing

Used to stabilize the product formulations and works as an emollient

More about Glyceryl stearate se
Sodium hydroxide~0.5–1.15%
Formula
Irritation risk
Low

Used to adjust the product's pH

More about Sodium hydroxide
Myristic acid~0.45–1.05%
Comedogenic 3/5Irritant · medium
Irritation risk
Medium
Comedogenicity
3/5
Works for
Cleansing

Helps oil and water mix together. Could be comedogenic

More about Myristic acid
Palmitic acid~0.4–0.9%
Formula
Irritation risk
Low
Works for
CleansingMoisturizing

An emollient that is naturally present in skin and helps soften it

More about Palmitic acid
Disodium edta~0.2–0.8%
Irritant · medium
Irritation risk
Medium

Stabilizes the product formulation

More about Disodium edta
Capryloyl glycine~0.35–0.8%
Key active
Irritation risk
Low
Works for
CleansingMoisturizing

Helps oil and water mix together, preserve cosmetic products, and attract water to the upper layer of the skin

More about Capryloyl glycine
Vitreoscilla ferment~0.15–0.65%
Formula
Irritation risk
Low
More about Vitreoscilla ferment
Citric acid~0.1–0.45%
Irritant · medium
Irritation risk
Medium

Can work as an exfoliant but is typically used to adjust the product pH

More about Citric acid
Xanthan gum~0.1–0.4%
Formula
Irritation risk
Low
Works for
Cleansing

Used to create a thicker product consistency

More about Xanthan gum
Sodium benzoate~0.1–0.3%
Formula
Irritation risk
Low

A preservative

More about Sodium benzoate
Phenoxyethanol~0.1–0.3%
Formula
Irritation risk
Low

A preservative. It helps prevent bacterial growth in cosmetic products

More about Phenoxyethanol
Piroctone olamine~0.05–0.3%
Irritant · medium
Irritation risk
Medium

A preservative

More about Piroctone olamine
Parfum~0.05–0.15%
Irritant · high
Irritation risk
High

An aromatic blend of unspecified and possibly irritating ingredients

More about Parfum
Ingredient list view

Water, Isononyl isononanoate, Glycerin, Dimethicone, Ammonium polyacryloyldimethyl taurate, Myristyl myristate, Stearic acid, Potassium cetyl phosphate, Zinc pca, Glyceryl stearate se, Sodium hydroxide, Myristic acid, Palmitic acid, Disodium edta, Capryloyl glycine, Vitreoscilla ferment, Citric acid, Xanthan gum, Sodium benzoate, Phenoxyethanol, Piroctone olamine, Parfum

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Sources cited in this review

Every concentration estimate and effectiveness label is anchored to one of these 7 studies and safety reviews.

  1. 1
    Glycerol and the skin: holistic approach to its origin and functionsncbi.nlm.nih.gov
  2. 2
    Dimethicone as a protective ingredient in topical medicationsjaad.org
  3. 3
    Final Report on the Safety Assessment of Dimethicone Copolyoljournals.sagepub.com
  4. 4
    Safety Assessment of Acryloyldimethyltaurate Polymers as Used in Cosmeticscir-safety.org
  5. 5
    Zinc L-pyrrolidone carboxylate inhibits the UVA-induced production of matrix metalloproteinase-1 by in vitro cultured skin fibroblasts, whereas it enhances their collagen synthesisonlinelibrary.wiley.com
  6. 6
    Zinc Therapy in Dermatology: A Review hindawi.com
La Roche-Posay Toleriane Kerium DS Moisturizer
La Roche-PosayToleriane Kerium DS Moisturizer
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As an Amazon Associate, WIMJ earns from qualifying purchases.