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La Roche-Posay Hydraphase Hyaluronic Acid Light Moisturiser
La Roche-Posay

La Roche-Posay Hydraphase Hyaluronic Acid Light Moisturiser

Efficacy37/100IrritancyLow
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Works for

1 of 2 advertised claims delivered

Moisturizing
12 ingredients credited for this claim
Good support
What the product description says
“lightweight rehydrating moisturiser”
Source: La roche posay UK

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, hydrolyzed hyaluronic acid.

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: caprylic/capric triglyceride, myristyl myristate.

Myristyl myristateKey active· Emollient, OcclusiveEffect: HighAn emollient. Is not recommended for acne-prone skin as it can be comedogenic~1.7–2.6%
Caprylic/capric triglycerideKey active· Emollient, OcclusiveEffect: HighA good mix of fatty acids that forms a protective layer on the skin. Improves the shelf life of products. Derived from coconut and glycerin~3.7–5.5%
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~4–6%
Hydrolyzed hyaluronic acidKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Attracts water into the upper layer of the skin. A version of it is naturally present in skin~0.15–0.6%
Sodium hyaluronateKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Attracts water into the upper layer of the skin~0.5–1.1%
Capryloyl glycineKey activeEffect: MediumHelps oil and water mix together, preserve cosmetic products, and attract water to the upper layer of the skin~0.15–0.7%
Lauroyl lysineKey activeEffect: MediumHelps soften the upper layer of the skin and creates a nice product texture~2.7–4.1%
Glyceryl stearate seKey activeEffect: MediumUsed to stabilize the product formulations and works as an emollient~0.85–1.25%
Stearic acid· EmollientEffect: LowHelps oil and water mix together and works as an emollient~1.3–1.9%
Caprylyl glycol· Humectant, EmollientEffect: LowHelps preserve products and creates a nice product texture~0.1–0.45%
Palmitic acid· EmollientEffect: LowAn emollient that is naturally present in skin and helps soften it~0.35–0.85%
C15-19 alkaneEffect: LowHelps soften the upper layer of the skin and create a nice product texture~2–3%
Anti-aging
No ingredient credited for this claim
No support
What the product description says
“fine lines from dehydration”
Source: La roche posay UK

Effective ingredients missing or their concentration is too low.

Can it cause trouble?

Irritancy
5 flagged ingredients
Low risk
We flag 5 ingredients with irritancy potential; the product's overall irritancy is low. The table lists each ingredient's own rating.
IngredientFunctionIrritationEst. amount
Caprylic/capric triglycerideA good mix of fatty acids that forms a protective layer on the skin. Improves the shelf life of products. Derived from coconut and glycerinMedium~3.7–5.5%est.
Myristyl myristateAn emollient. Is not recommended for acne-prone skin as it can be comedogenicMedium~1.7–2.6%est.
Potassium cetyl phosphateHelps oil and water mix togetherMedium~1–1.5%est.
Myristic acidHelps oil and water mix together. Could be comedogenicMedium~0.4–0.9%est.
Caprylyl glycolHelps preserve products and creates a nice product textureMedium~0.1–0.45%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 comedogenic3/5~1.7–2.6%est.
Myristic acidHelps oil and water mix together. Could be comedogenic3/5~0.4–0.9%est.
Glyceryl stearate seUsed to stabilize the product formulations and works as an emollient2/5~0.85–1.25%est.
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Ingredients

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Water~40–60%
Formula
Irritation risk
Low

Plain old water

More about Water
Glycerin~4–6%
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
Caprylic/capric triglyceride~3.7–5.5%
Key activeIrritant · medium
Irritation risk
Medium
Works for
Moisturizing

A good mix of fatty acids that forms a protective layer on the skin. Improves the shelf life of products. Derived from coconut and glycerin

More about Caprylic/capric triglyceride
Lauroyl lysine~2.7–4.1%
Key active
Irritation risk
Low
Works for
Moisturizing

Helps soften the upper layer of the skin and creates a nice product texture

More about Lauroyl lysine
C15-19 alkane~2–3%
Formula
Irritation risk
Low
Works for
Moisturizing

Helps soften the upper layer of the skin and create a nice product texture

More about C15-19 alkane
Myristyl myristate~1.7–2.6%
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
Ammonium polyacryloyldimethyl taurate~1.3–2%
Formula
Irritation risk
Low

Used to create a thicker product consistency

More about Ammonium polyacryloyldimethyl taurate
Stearic acid~1.3–1.9%
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~1–1.5%
Irritant · medium
Irritation risk
Medium
Works for
Cleansing

Helps oil and water mix together

More about Potassium cetyl phosphate
Glyceryl stearate se~0.85–1.25%
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 hyaluronate~0.5–1.1%
Key active
Irritation risk
Low
Works for
Moisturizing

One of the best moisturizing ingredients. Attracts water into the upper layer of the skin

More about Sodium hyaluronate
Sodium hydroxide~0.4–0.95%
Formula
Irritation risk
Low

Used to adjust the product's pH

More about Sodium hydroxide
Myristic acid~0.4–0.9%
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~0.35–0.85%
Formula
Irritation risk
Low
Works for
CleansingMoisturizing

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

More about Palmitic acid
Hydrolyzed hyaluronic acid~0.15–0.6%
Key active
Irritation risk
Low
Works for
Moisturizing

One of the best moisturizing ingredients. Attracts water into the upper layer of the skin. A version of it is naturally present in skin

More about Hydrolyzed hyaluronic acid
Capryloyl glycine~0.15–0.7%
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
Caprylyl glycol~0.1–0.45%
Irritant · medium
Irritation risk
Medium
Works for
Moisturizing

Helps preserve products and creates a nice product texture

More about Caprylyl glycol
Xanthan gum~0.05–0.25%
Formula
Irritation risk
Low
Works for
Cleansing

Used to create a thicker product consistency

More about Xanthan gum
Pentaerythrityl tetra-di-t-butyl hydroxyhydrocinnamate~0.05–0.25%
Formula
Irritation risk
Low

Used to increase stability of product formulations

More about Pentaerythrityl tetra-di-t-butyl hydroxyhydrocinnamate
Parfum / fragrance
Not recognized
Ingredient list view

Water, Glycerin, Caprylic/capric triglyceride, Lauroyl lysine, C15-19 alkane, Myristyl myristate, Ammonium polyacryloyldimethyl taurate, Stearic acid, Potassium cetyl phosphate, Glyceryl stearate se, Sodium hyaluronate, Sodium hydroxide, Myristic acid, Palmitic acid, Hydrolyzed hyaluronic acid, Capryloyl glycine, Caprylyl glycol, Xanthan gum, Pentaerythrityl tetra-di-t-butyl hydroxyhydrocinnamate, Unknown

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La roche posay UK
≈ $21.54
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≈ $42.10
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Sources cited in this review

Every concentration estimate and effectiveness label is anchored to one of these 8 studies and safety reviews.

  1. 1
    Glycerol and the skin: holistic approach to its origin and functionsncbi.nlm.nih.gov
  2. 2
    Safety Assessment of Acryloyldimethyltaurate Polymers as Used in Cosmeticscir-safety.org
  3. 3
    Hyaluronic acid: A key molecule in skin agingncbi.nlm.nih.gov
  4. 4
    Hyaluronan (Hyaluronic Acid): a natural moisturizer for skin careresearchgate.net
  5. 5
    The fatty acid profile of the skin surface lipid layer in papulopustular rosaceancbi.nlm.nih.gov
  6. 6
    Efficacy of a New Topical Nano-hyaluronic Acid in Humansncbi.nlm.nih.gov
La Roche-Posay Hydraphase Hyaluronic Acid Light Moisturiser
La Roche-PosayHydraphase Hyaluronic Acid Light Moisturiser
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