Potent-C Niacinamide Discoloration Treatment

Peter Thomas Roth

Potent-C Niacinamide Discoloration Treatment

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About this product

The Peter Thomas Roth Potent-C Niacinamide Discoloration Treatment is a treatment. Our analysis of its 42 ingredients (36 low-risk) rates it Excellent (97/100). Based on its ingredients, it looks well-suited to oily / acne-prone skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Treatments
Ingredients
42
Low-risk
36
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 9/11
Good for dry skin
Glyceryl Stearate Dimethiconol Cetyl Alcohol Isononyl Isononanoate Caprylic/Capric Triglyceride Caprylyl Glycol Glycerin Coco-Caprylate/Caprate Dimethicone
Caution for dry skin
Glyceryl Stearate SE Cetyl Alcohol Sodium Stearoyl Glutamate Glycerin Hexylene Glycol Ceteth-20 Steareth-20 Polysorbate 20 PEG-75 Stearate Silica Tranexamic Acid
Oily/Acne-Prone Skin 1/0
Good for oily/acne-prone skin
Tranexamic Acid
Sensitive Skin 8/9
Good for sensitive skin
Diethylhexyl Syringylidenemalonate Kojic Acid Resveratrol Alpha-Arbutin Glycerin Tetrahexyldecyl Ascorbate Dimethicone Tocopheryl Acetate
Caution for sensitive skin
Kojic Acid Cetyl Alcohol Caprylic/Capric Triglyceride Glycerin Hexylene Glycol Citric Acid Sodium Benzoate Potassium Sorbate Phenoxyethanol

Ingredients list

42 total
Lower hazard (1) Higher hazard (7)
All42 Skin Conditioning27 Solvent8 Emulsifying8 Emollient8 Surfactant7 Fragrance7 Skin Protecting7 Viscosity Controlling6
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
1
Dimethyl Isosorbide
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
B
Isononyl Isononanoate
(Skin Conditioning, Emollient, Antistatic Agent)
Tranexamic Acid
(Cosmetic Astringent, Skin Conditioning)
3
A
Dimethicone
(Antifoaming Agent, Skin Protecting, Emollient, Skin Conditioning)
Silicone
Silicone
1
A
Caprylic/Capric Triglyceride
(Emollient, Masking, Perfuming, Skin Conditioning, Solvent)
1
Alpha-Arbutin
(Antioxidant, Skin Conditioning)
1
A
Cetyl Alcohol
(Emulsion Stabilising, Fragrance, Opacifying, Emulsifying, Surfactant, Foam Boosting, Viscosity Increasing Agent, Emollient, Masking, Viscosity Controlling)
1
A
Glyceryl Stearate
(Emollient, Emulsifying)
Fungal Acne
Fungal Acne Trigger
1
A
Pentylene Glycol
(Skin Conditioning, Solvent)
1
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
C9-12 Alkane
(Solvent)
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
1
A
Glyceryl Stearate SE
(Emulsifying, Surfactant)
Bad for Oily Skin
Bad for Oily Skin
Butyrospermum Parkii Butter
(Skin Conditioning, Viscosity Controlling)
1
Tetrahexyldecyl Ascorbate
(Antioxidant, Skin Conditioning)
6
7
B
Kojic Acid
(Antioxidant)
Good for Dry Skin
Good for Dry Skin
1
Resveratrol
(Antioxidant, Skin Protecting)
3
Tocopheryl Acetate
(Antioxidant, Skin Conditioning)
Bad for Oily Skin
Bad for Oily Skin
1
Diethylhexyl Syringylidenemalonate
(Skin Protecting)
Hydrangea Arborescens Root Extract
(Skin Conditioning)
1
Morus Alba Root Extract
(Bleaching, Skin Conditioning)
Scutellaria Lateriflora Extract
(Skin Conditioning)
1
Hydrolyzed Vegetable Protein
(Hair Conditioning, Skin Conditioning, Antistatic Agent)
1
2
A
Silica
(Abrasive, Absorbent, Anticaking Agent, Bulking Agent, Opacifying, Viscosity Controlling)
1
B
Sodium Stearoyl Glutamate
(Hair Conditioning, Skin Conditioning, Surfactant Cleansingagent, Emulsifying)
1
B
Coco-Caprylate/Caprate
(Emollient, Skin Conditioning)
1
A
Dimethiconol
(Antifoaming Agent, Skin Conditioning, Emollient, Moisturising)
Silicone
Silicone
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
Sodium Phytate
(Chelating Agent, Oral Care Agent)
3
A
Potassium Sorbate
(Fragrance, Preservative)
3
A
Sodium Benzoate
(Fragrance, Preservative, Anticorrosive, Masking)
1
A
Caprylyl Glycol
(Hair Conditioning, Skin Conditioning, Emollient, Humectant)
1
A
Hexylene Glycol
(Fragrance, Solvent, Viscosity Decreasing Agent, Emulsifying, Perfuming, Skin Conditioning, Surfactant)
3
B
Polysorbate 20
(Emulsifying, Surfactant)
Fungal Acne
Fungal Acne Trigger
2
B
Ceteth-20
(Cleansing, Emulsifying, Surfactant)
3
B
Steareth-20
(Sufactant, Emulsifying, Surfactant)
1
Polyacrylate Crosspolymer-6
(Emulsion Stabilising, Viscosity Controlling)
3
A
PEG-75 Stearate
(Surfactant)
1
3
Titanium Dioxide
(Cosmetic Colorant, Opacifying, Sunscreen Agent, Uv Absorber)
Good for Sensitive Skin
Good for Sensitive Skin
4
A
Phenoxyethanol
(Fragrance, Preservative)
Paraben
Paraben

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

Niacinamide
Skin Conditioning
Isononyl Isononanoate
Skin Conditioning, Emollient
Tranexamic Acid
Skin Conditioning
Dimethicone
Skin Protecting, Emollient
Caprylic/Capric Triglyceride
Emollient, Skin Conditioning
Alpha-Arbutin
Antioxidant, Skin Conditioning

Benefits

Good for oily/acne-prone skin

Concerns

Contains paraben
Contains silicone
Not fungal acne (malassezia) safe
Kojic Acid — 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
Niacinamide
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningSmoothing
Dimethyl Isosorbide
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
Isononyl Isononanoate
Skin conditioning, Emollient
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Skin conditioningEmollientAntistatic agent
Tranexamic Acid
Cosmetic astringent, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Cosmetic astringentSkin conditioning
Caprylic/Capric Triglyceride
Emollient, Masking
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmollientMaskingPerfumingSkin conditioningSolvent
Alpha-Arbutin
Antioxidant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 AntioxidantSkin conditioning
Cetyl Alcohol
Emulsion stabilising, Fragrance
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Emulsion stabilisingFragranceOpacifyingEmulsifyingSurfactantFoam boostingViscosity increasing agentEmollientMaskingViscosity controlling
Pentylene Glycol
Skin conditioning, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningSolvent
Propanediol
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
C9-12 Alkane
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Butyrospermum Parkii Butter
Skin conditioning, Viscosity controlling
Limited public safety data.Read moreShow less
EWG N/A Skin conditioningViscosity controlling
Tetrahexyldecyl Ascorbate
Antioxidant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 AntioxidantSkin conditioning
Resveratrol
Antioxidant, Skin protecting
Low-hazard ingredient.Read moreShow less
EWG 1 AntioxidantSkin protecting
Diethylhexyl Syringylidenemalonate
Skin protecting
Low-hazard ingredient.Read moreShow less
EWG 1 Skin protecting
+ 16 more — see the full ingredients list above
Dimethicone
Antifoaming agent, Skin protecting
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Antifoaming agentSkin protectingEmollientSkin conditioning Silicone
Glyceryl Stearate
Emollient, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmollientEmulsifying Fungal-acne trigger
Citric Acid
Chelating agent, Fragrance
Skin irritation can occur at high concentrationRead moreShow less
EWG 2 CIR A Chelating agentFragrancePh adjusterBuffering agentMasking Bad for Sensitive Skin
Glyceryl Stearate SE
Emulsifying, Surfactant
Potentially comedogenic - can block poresRead moreShow less
EWG 1 CIR A EmulsifyingSurfactant Bad for Oily Skin
Kojic Acid
Antioxidant
Higher-hazard ingredient.Read moreShow less
EWG 6–7 CIR B Antioxidant Good for Dry Skin
Tocopheryl Acetate
Antioxidant, Skin conditioning
Potentially comedogenic - can block poresRead moreShow less
EWG 3 AntioxidantSkin conditioning Bad for Oily Skin
Dimethiconol
Antifoaming agent, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antifoaming agentSkin conditioningEmollientMoisturising Silicone
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
Polysorbate 20
Emulsifying, Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B EmulsifyingSurfactant Fungal-acne trigger
Titanium Dioxide
Cosmetic colorant, Opacifying
Low-to-moderate hazard.Read moreShow less
EWG 1–3 Cosmetic colorantOpacifyingSunscreen agentUv absorber Good for Sensitive Skin
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: Apply after toner and before moisturiser — thinnest to thickest.
  • 2 Morning only: Apply as the last step of your AM routine, after moisturiser, and reapply every ~2 hours of sun exposure.

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

Trust & honesty

Officially notified as a cosmetic in Malaysia (NPRA). Government registration record.

Effective levels — general guide

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

Vitamin C (ascorbic) 5–20%

L-ascorbic acid is usually used at 5–20% (around 10–15% is common). Above ~20% adds little and tends to irritate more; it also needs a low pH to work.

Tetrahexyldecyl Ascorbate

Niacinamide 2–5% (up to 10%)

Most research uses 2–5%; some formulas go to 10%. Very high levels can cause flushing in sensitive skin.

Niacinamide

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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