Kertyol P.S.O. Kerato-Reducing Shampoo

Ducray

Kertyol P.S.O. Kerato-Reducing Shampoo

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About this product

The Ducray Kertyol P.S.O. Kerato-Reducing Shampoo is a misc. Our analysis of its 14 ingredients (10 low-risk) rates it Excellent (90/100). 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
Misc
Ingredients
14
Low-risk
10
Fragrance
Contains fragrance
Origin
France
Data updated
May 2026

The evidence

Quick Product Notes

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

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 2/5
Good for dry skin
Caprylic/Capric Triglyceride Glycerin
Caution for dry skin
Sodium Trideceth Sulfate Glycerin Salicylic Acid Talc Silica
Oily/Acne-Prone Skin 2/0
Good for oily/acne-prone skin
Sulfur Salicylic Acid
Sensitive Skin 2/5
Good for sensitive skin
Glycerin Talc
Caution for sensitive skin
Sodium Chloride Caprylic/Capric Triglyceride Glycerin Salicylic Acid Methylisothiazolinone

Ingredients list

14 total
Lower hazard (1) Higher hazard (7)
All14 Skin Conditioning4 Foam Boosting4 Hair Conditioning4 Masking3 Perfuming3 Skin Protecting3 Bulking Agent3 Viscosity Controlling3
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
A
Sodium Trideceth Sulfate
(Cleansing, Emulsifying, Foaming, Surfactant)
2
A
Glycerin
(Denaturant, Fragrance, Hair Conditioning, Humectant, Oral Care Agent, Oral Health Care Drug, Skin Protecting, Viscosity Decreasing Agent, Perfuming, Solvent)
Good for Dry Skin
Good for Dry Skin
Fungal Acne
Fungal Acne Trigger
1
A
Caprylic/Capric Triglyceride
(Emollient, Masking, Perfuming, Skin Conditioning, Solvent)
1
Sodium Lauroamphoacetate
(Hair Conditioning, Sufactant, Foam Boosting, Foaming)
1
Sulfur
(Antiacne Agent, Antidandruff Agent, Hair Conditioning, Skin Conditioning Agent Miscellaneous, Antiseborrhoeic, Antistatic Agent, Skin Conditioning)
Good for Oily Skin
Good for Oily Skin
1
Sodium Chloride
(Bulking Agent, Masking, Oral Care Agent, Viscosity Controlling)
1
Cocamide MIPA
(Foam Boosting, Viscosity Increasing Agent, Emulsifying, Emulsion Stabilising, Viscosity Controlling)
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
3
A
Talc
(Abrasive, Absorbent, Anticaking Agent, Bulking Agent, Opacifying, Skin Protecting, Slip Modifier)
PARFUM
(Fragrance, Perfuming)
Ictasol
(Anti Seborrheic, Antimicrobial)
1
2
A
Silica
(Abrasive, Absorbent, Anticaking Agent, Bulking Agent, Opacifying, Viscosity Controlling)
7
B
Methylisothiazolinone
(Preservative)

My Ingredient Notes

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Key ingredients

Exfoliators
Removes dead skin cells to smoothe texture.
BHA
Unclogs pores and reduces excess oil.

Benefits

Acne FightingFights acne and helps prevent breakouts.
HydratingBoosts hydration and relieves dry, tight skin.
Good For Oily SkinBalances oil and helps reduce shine.
Reduces Large PoresMinimizes the look of enlarged pores.
Barrier RepairStrengthen and restore your skin's natural barrier.
BrighteningRestores radiance to dull, tired skin.
Scar HealingImproves the look of marks and scars.
Skin TextureSmooths rough patches and refines texture.

Concerns

Not fungal acne (malassezia) safe
Methylisothiazolinone — 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
Sodium Trideceth Sulfate
Cleansing, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A CleansingEmulsifyingFoamingSurfactant
Caprylic/Capric Triglyceride
Emollient, Masking
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmollientMaskingPerfumingSkin conditioningSolvent
Sodium Lauroamphoacetate
Hair conditioning, Sufactant
Low-hazard ingredient.Read moreShow less
EWG 1 Hair conditioningSufactantFoam boostingFoaming
Sodium Chloride
Bulking agent, Masking
Low-hazard ingredient.Read moreShow less
EWG 1 Bulking agentMaskingOral care agentViscosity controlling
Cocamide MIPA
Foam boosting, Viscosity increasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 Foam boostingViscosity increasing agentEmulsifyingEmulsion stabilisingViscosity controlling
Talc
Abrasive, Absorbent
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A AbrasiveAbsorbentAnticaking agentBulking agentOpacifyingSkin protectingSlip modifier
PARFUM
Fragrance, Perfuming
Limited public safety data.Read moreShow less
EWG N/A FragrancePerfuming
Ictasol
Anti seborrheic, Antimicrobial
Limited public safety data.Read moreShow less
EWG N/A Anti seborrheicAntimicrobial
Silica
Abrasive, Absorbent
Low-hazard ingredient.Read moreShow less
EWG 1–2 CIR A AbrasiveAbsorbentAnticaking agentBulking agentOpacifyingViscosity controlling
Glycerin
Denaturant, Fragrance
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A DenaturantFragranceHair conditioningHumectantOral care agentOral health care drugSkin protectingViscosity decreasing agentPerfumingSolvent Good for Dry SkinFungal-acne trigger
Sulfur
Antiacne agent, Antidandruff agent
Low-hazard ingredient.Read moreShow less
EWG 1 Antiacne agentAntidandruff agentHair conditioningSkin-conditioning agent -miscellaneousAntiseborrhoeicAntistatic agentSkin conditioning Good for Oily Skin
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
Methylisothiazolinone
Preservative
Higher-hazard ingredient.Read moreShow less
EWG 7 CIR B Preservative

How to use

How to use

  • 1 Evening, start slow: Best in the PM a few times a week to begin with; avoid layering with other strong actives the same night.
  • 2 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)

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

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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