Peter Thomas Roth Irish Moor Mud Purifying Black Mask

Peter Thomas Roth

Peter Thomas Roth Irish Moor Mud Purifying Black Mask

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About this product

The Peter Thomas Roth Irish Moor Mud Purifying Black Mask is a wash-off mask. Our analysis of its 23 ingredients (18 low-risk) rates it Excellent (94/100).

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Wash-Off Mask
Ingredients
23
Low-risk
18
Fragrance
Fragrance-free
Origin
United States

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 5/9
Good for dry skin
C13-14 Isoparaffin Isohexadecane Glycerin Dimethicone Lactic Acid
Caution for dry skin
Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer Sorbitan Oleate Charcoal Powder Xanthan Gum Kaolin Glycerin Bentonite Laureth-7 Polysorbate 80
Oily/Acne-Prone Skin No data
Sensitive Skin 3/6
Good for sensitive skin
Kaolin Glycerin Dimethicone
Caution for sensitive skin
Sorbitan Oleate Glycerin Sodium Benzoate Potassium Sorbate Lactic Acid Phenoxyethanol

Ingredients list

23 total
Lower hazard (1) Higher hazard (4)
All23 Skin Conditioning10 Fragrance6 Opacifying5 Emulsion Stabilising5 Solvent4 Skin Protecting4 Absorbent3 Viscosity Increasing Agent3
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
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
Peat
(Skin Conditioning)
1
Charcoal Powder
(Abrasive, Absorbent, Colorant, Opacifying, Cosmetic Colorant)
4
B
Polyacrylamide
(Binding Agent, Film Forming, Hair Fixing, Antistatic Agent, Binding)
Lava Powder
(Skin Conditioning)
Sargassum Fulvellum Extract
(Skin Conditioning)
1
A
Kaolin
(Abrasive, Absorbent, Anticaking Agent, Bulking Agent, Opacifying, Skin Protecting, Slip Modifier)
2
A
Bentonite
(Absorbent, Bulking Agent, Emulsion Stabilising, Opacifying, Suspending Agent Nonsurfactant, Viscosity Increasing Agent, Viscosity Controlling)
4
B
Lactic Acid
(Exfoliant, Fragrance, Humectant, Ph Adjuster, Skin Conditioning Agent Humectant, Skin Conditioning, Buffering Agent)
Bad for Sensitive Skin
Bad for Sensitive Skin
1
B
C13-14 Isoparaffin
(Emollient, Solvent)
1
B
Isohexadecane
(Skin Conditioning, Emollient, Solvent)
1
Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
(Anticaking Agent, Emulsion Stabilising, Opacifying, Suspending Agent Nonsurfactant, Viscosity Increasing Agent)
3
A
Dimethicone
(Antifoaming Agent, Skin Protecting, Emollient, Skin Conditioning)
Silicone
Silicone
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
1
A
Disodium EDTA
(Chelating Agent, Viscosity Controlling)
3
B
Polysorbate 80
(Denaturant, Emulsifying, Surfactant)
Fungal Acne
Fungal Acne Trigger
3
B
Laureth-7
(Emulsifying, Surfactant)
1
A
Sorbitan Oleate
(Fragrance, Emulsifying, Surfactant)
Bad for Oily Skin
Bad for Oily Skin
Fungal Acne
Fungal Acne Trigger
3
A
Sodium Benzoate
(Fragrance, Preservative, Anticorrosive, Masking)
3
A
Potassium Sorbate
(Fragrance, Preservative)
4
A
Phenoxyethanol
(Fragrance, Preservative)
Paraben
Paraben
2
Mica
(Cosmetic Colorant, Opacifying)

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

Glycerin
Humectant, Skin Protecting
Peat
Skin Conditioning
Lava Powder
Skin Conditioning
Sargassum Fulvellum Extract
Skin Conditioning
Kaolin
Skin Protecting
Lactic Acid
Exfoliant, Humectant

Benefits

No standout benefits flagged for this product.

Concerns

Contains paraben
Contains silicone
Not fungal acne (malassezia) safe
May not suit dry skin
May not suit sensitive skin

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Peat
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Charcoal Powder
Abrasive, Absorbent
Low-hazard ingredient.Read moreShow less
EWG 1 AbrasiveAbsorbentColorantOpacifyingCosmetic colorant
Polyacrylamide
Binding agent, Film forming
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR B Binding agentFilm formingHair fixingAntistatic agentBinding
Lava Powder
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Sargassum Fulvellum Extract
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Kaolin
Abrasive, Absorbent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A AbrasiveAbsorbentAnticaking agentBulking agentOpacifyingSkin protectingSlip modifier
Bentonite
Absorbent, Bulking agent
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A AbsorbentBulking agentEmulsion stabilisingOpacifyingSuspending agent -nonsurfactantViscosity increasing agentViscosity controlling
C13-14 Isoparaffin
Emollient, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B EmollientSolvent
Isohexadecane
Skin conditioning, Emollient
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Skin conditioningEmollientSolvent
Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Anticaking agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 Anticaking agentEmulsion stabilisingOpacifyingSuspending agent - nonsurfactantViscosity increasing agent
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
Disodium EDTA
Chelating agent, Viscosity controlling
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Chelating agentViscosity controlling
Laureth-7
Emulsifying, Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B EmulsifyingSurfactant
Sodium Benzoate
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A FragrancePreservativeAnticorrosiveMasking
+ 2 more — see the full ingredients list above
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
Lactic Acid
Exfoliant, Fragrance
Skin irritation can occur at high concentrationRead moreShow less
EWG 4 CIR B ExfoliantFragranceHumectantPh adjusterSkin-conditioning agent -humectantSkin conditioningBuffering agent Bad for Sensitive Skin
Dimethicone
Antifoaming agent, Skin protecting
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Antifoaming agentSkin protectingEmollientSkin conditioning Silicone
Polysorbate 80
Denaturant, Emulsifying
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B DenaturantEmulsifyingSurfactant Fungal-acne trigger
Sorbitan Oleate
Fragrance, Emulsifying
Potentially comedogenic - can block poresRead moreShow less
EWG 1 CIR A FragranceEmulsifyingSurfactant Bad for Oily SkinFungal-acne trigger
Phenoxyethanol
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR A FragrancePreservative Paraben

How to use

How to use

  • 1 Where it fits: Use as the first step, on clean hands, before the rest of your routine.
  • 2 Morning & evening: Suitable for both AM and PM use.

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

Trust & honesty

Effective levels — general guide

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

AHA (acid exfoliant) 5–10% (OTC)

OTC leave-on AHAs are usually 5–10%. The effect also depends on pH and free-acid value, not the percentage alone.

Lactic 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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