La Roche-Posay Effaclar K Acne Treatment Fluid

La Roche-Posay

La Roche-Posay Effaclar K Acne Treatment Fluid

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About this product

The La Roche-Posay Effaclar K Acne Treatment Fluid is a treatment. Our analysis of its 19 ingredients (14 low-risk) rates it Excellent (85/100). Based on its ingredients, it looks well-suited to oily / acne-prone skin. Heads up: it contains fragrance, which can irritate sensitive or reactive skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Treatments
Ingredients
19
Low-risk
14
Fragrance
Contains fragrance
Origin
France

The evidence

Quick Product Notes

Paraben-Free Sulfate-Free Alcohol-Free Silicone-Free EU Allergen-Free Fungal Acne (Malassezia) Safe

Notable Effects & Ingredients

No Notable Effects & Ingredients

Ingredients Related to Skin Types

Good   Bad — tap a skin type to see which ingredients · estimated from ingredient functions
Dry Skin 7/8
Good for dry skin
Glyceryl Stearate DI-C12-13 Alkyl Malate Cetyl Alcohol Propylene Glycol Cyclohexasiloxane Zinc PCA PEG-4
Caution for dry skin
Cetyl Alcohol Xanthan Gum Salicylic Acid Aluminum Starch Octenylsuccinate Sodium Hydroxide PEG-100 Stearate PEG-4 Dilaurate PEG-4 Laurate
Oily/Acne-Prone Skin 1/0
Good for oily/acne-prone skin
Salicylic Acid
Sensitive Skin 0/4
Caution for sensitive skin
Cetyl Alcohol Propylene Glycol Salicylic Acid Fragrance

Ingredients list

19 total
Lower hazard (1) Higher hazard (8)
All19 Skin Conditioning13 Emulsion Stabilising5 Viscosity Controlling5 Emulsifying4 Surfactant4 Viscosity Increasing Agent4 Humectant4 Emollient4
EWG CIR Ingredient Name & Cosmetic Functions Notes
4
B
Salicylic Acid
(Antiacne Agent, Antidandruff Agent, Corn/Callus/Wart Remover, Denaturant, Exfoliant, Fragrance, Hair Conditioning, Skin Conditioning, Keratolytic, Masking, Preservative)
Good for Oily Skin
Good for Oily Skin
Bad for Sensitive Skin
Bad for Sensitive Skin
1
Water
(Solvent)
1
A
DI-C12-13 Alkyl Malate
(Skin Conditioning, Emollient)
2
A
Cyclohexasiloxane
(Hair Conditioning, Skin Conditioning, Emollient, Solvent)
3
B
Propylene Glycol
(Fragrance, Humectant, Skin Conditioningagent Miscellaneous, Solvent, Viscosity Decreasing Agent, Skin Conditioning, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
2
B
Aluminum Starch Octenylsuccinate
(Absorbent, Anticaking Agent, Viscosity Increasing Agent, Viscosity Controlling)
3
A
PEG-100 Stearate
(Surfactant)
Fungal Acne
Fungal Acne Trigger
1
A
Glyceryl Stearate
(Emollient, Emulsifying)
Fungal Acne
Fungal Acne Trigger
1
A
Cetyl Alcohol
(Emulsion Stabilising, Fragrance, Opacifying, Emulsifying, Surfactant, Foam Boosting, Viscosity Increasing Agent, Emollient, Masking, Viscosity Controlling)
5
B
PEG-4 Dilaurate
(Emulsifying, Surfactant)
5
B
PEG-4 Laurate
(Emulsifying, Surfactant)
3
Zinc PCA
(Skin Conditioning, Humectant)
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
1
B
Capryloyl Salicylic Acid
(Skin Conditioning)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
1
Acrylates/C10-30 Alkyl Acrylate Crosspolymer
(Emulsion Stabilising, Film Forming, Viscosity Controlling)
4
6
B
Iodopropynyl Butylcarbamate
(Preservative)
3
A
PEG-4
(Humectant, Solvent)
8
Fragrance
(Deodorant, Masking, Perfuming)

My Ingredient Notes

No personal ingredient notes yet. Save ingredients to your profile to get good/bad alerts here.

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Key ingredients

Salicylic Acid
Exfoliant, Skin Conditioning
DI-C12-13 Alkyl Malate
Skin Conditioning, Emollient
Cyclohexasiloxane
Skin Conditioning, Emollient
Propylene Glycol
Humectant, Skin Conditioning
Glyceryl Stearate
Emollient
Cetyl Alcohol
Emollient

Benefits

Good for oily/acne-prone skin

Concerns

Not fungal acne (malassezia) safe
Fragrance — higher EWG
May not suit dry skin
May not suit sensitive skin

EWG flags hazard, not real-world risk — ratings don't account for how much of an ingredient a product contains. Treat these as things to research, not verdicts. How we score →

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
DI-C12-13 Alkyl Malate
Skin conditioning, Emollient
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningEmollient
Cyclohexasiloxane
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A Hair conditioningSkin conditioningEmollientSolvent
Aluminum Starch Octenylsuccinate
Absorbent, Anticaking agent
Low-hazard ingredient.Read moreShow less
EWG 2 CIR B AbsorbentAnticaking agentViscosity increasing agentViscosity controlling
Cetyl Alcohol
Emulsion stabilising, Fragrance
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Emulsion stabilisingFragranceOpacifyingEmulsifyingSurfactantFoam boostingViscosity increasing agentEmollientMaskingViscosity controlling
Zinc PCA
Skin conditioning, Humectant
Low-to-moderate hazard.Read moreShow less
EWG 3 Skin conditioningHumectant
Sodium Hydroxide
Denaturant, Ph adjuster
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B DenaturantPh adjusterBuffering agent
Capryloyl Salicylic Acid
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Skin conditioning
Xanthan Gum
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingSkin conditioningSurfactant -emulsifying agentViscosity increasing agentBindingGel formingViscosity controlling
Acrylates/C10-30 Alkyl Acrylate Crosspolymer
Emulsion stabilising, Film forming
Low-hazard ingredient.Read moreShow less
EWG 1 Emulsion stabilisingFilm formingViscosity controlling
PEG-4
Humectant, Solvent
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A HumectantSolvent
Salicylic Acid
Antiacne agent, Antidandruff agent
Skin irritation can occur at high concentrationRead moreShow less
EWG 4 CIR B Antiacne agentAntidandruff agentCorn/callus/wart removerDenaturantExfoliantFragranceHair conditioningSkin conditioningKeratolyticMaskingPreservative Good for Oily SkinBad for Sensitive Skin
Propylene Glycol
Fragrance, Humectant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B FragranceHumectantSkin-conditioningagent - miscellaneousSolventViscosity decreasing agentSkin conditioningViscosity controlling Good for Dry Skin
PEG-100 Stearate
Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Surfactant Fungal-acne trigger
Glyceryl Stearate
Emollient, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmollientEmulsifying Fungal-acne trigger
PEG-4 Dilaurate
Emulsifying, Surfactant
Moderate-hazard ingredient.Read moreShow less
EWG 5 CIR B EmulsifyingSurfactant
PEG-4 Laurate
Emulsifying, Surfactant
Moderate-hazard ingredient.Read moreShow less
EWG 5 CIR B EmulsifyingSurfactant
Iodopropynyl Butylcarbamate
Preservative
Moderate-hazard ingredient.Read moreShow less
EWG 4–6 CIR B Preservative
Fragrance
Deodorant, Masking
Higher-hazard ingredient.Read moreShow less
EWG 8 DeodorantMaskingPerfuming

How to use

How to use

  • 1 Where it fits: Apply after toner and before moisturiser — thinnest to thickest.
  • 2 Evening, start slow: Best in the PM a few times a week to begin with; avoid layering with other strong actives the same night.
  • 3 Wear SPF the next day: Acids and retinoids increase sun sensitivity — daily sunscreen is a must while using this.

General guidance from this product's category and active ingredients — always follow the directions on the package.

Trust & honesty

Pregnancy & breastfeeding

Contains ingredients some choose to avoid or double-check while pregnant or nursing.

Use with caution
BHA (salicylic) (Salicylic Acid, Capryloyl Salicylic Acid)

Low-strength topical salicylic acid (BHA) is generally considered fine. Caution is usually reserved for high-strength leave-on products and salicylic peels.

This is general information, not medical advice. Pregnancy guidance varies and depends on concentration and your individual situation — always check with your doctor, midwife or pharmacist. How we flag this.

Effective levels — general guide

The concentrations these actives are typically effective at in research — not a measurement of this product.

BHA (salicylic) 0.5–2%

Salicylic acid is OTC-capped at 2%; 0.5–2% is the usual leave-on range. Much below that it acts more as a soothing agent than an exfoliant.

Salicylic Acid, Capryloyl Salicylic Acid

INCI lists don't disclose amounts, and we don't claim to know this product's levels — these are the ranges these ingredients are usually effective at, so you can tell a real formula from "fairy-dusting" a marketed active. How we estimate this.

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