PRO Strength Retinoid Peptide Serum

Peter Thomas Roth

Where to buy Possibly in stock

About this product

The Peter Thomas Roth PRO Strength Retinoid Peptide Serum is a serums, essence, ampoule. Our analysis of its 36 ingredients (28 low-risk) rates it Excellent (99/100). Based on its ingredients, it looks well-suited to dry skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
36
Low-risk
28
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 16/6
Good for dry skin
Linoleic Acid Squalane Ethylhexyl Hydroxystearate Ethoxydiglycol Oleic Acid Isononyl Isononanoate Caprylic/Capric Triglyceride Sodium PCA Sodium Hyaluronate Coco-Caprylate/Caprate Triolein Palmitic Acid Hordeum Vulgare Extract Dimethicone Cyclopentasiloxane Lecithin
Caution for dry skin
Linoleic Acid Stearic Acid Oleic Acid Palmitic Acid Hydroxystearic Acid Lecithin
Oily/Acne-Prone Skin No data
Sensitive Skin 1/7
Good for sensitive skin
Dimethicone
Caution for sensitive skin
Linoleic Acid Stearic Acid Ethoxydiglycol Oleic Acid Caprylic/Capric Triglyceride Palmitic Acid Phenoxyethanol

Ingredients list

36 total
Lower hazard (1) Higher hazard (4)
All36 Skin Conditioning32 Emollient13 Fragrance9 Solvent7 Hair Conditioning6 Emulsifying4 Antistatic Agent4 Humectant4
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
C9-12 Alkane
(Solvent)
3
A
Dimethicone
(Antifoaming Agent, Skin Protecting, Emollient, Skin Conditioning)
Silicone
Silicone
1
B
Isononyl Isononanoate
(Skin Conditioning, Emollient, Antistatic Agent)
1
Dimethyl Isosorbide
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
2
Trisiloxane
(Antifoaming Agent, Skin Conditioning)
3
A
Cyclopentasiloxane
(Hair Conditioning, Skin Conditioning, Emollient, Solvent)
Silicone
Silicone
1
Polysilicone-11
(Film Forming)
1
B
Coco-Caprylate/Caprate
(Emollient, Skin Conditioning)
1
A
Caprylic/Capric Triglyceride
(Emollient, Masking, Perfuming, Skin Conditioning, Solvent)
Hydroxypinacolone Retinoate
(Skin Conditioning)
1
Palmitoyl Hexapeptide-14
(Skin Conditioning)
1
Ceramide NP
(Hair Conditioning, Skin Conditioning)
Helianthus Annuus Seed Extract
(Skin Conditioning)
1
Hordeum Vulgare Extract
(Emollient, Skin Conditioning)
Cucumis Sativus Extract
(Skin Conditioning)
Laminaria Ochroleuca Extract
(Skin Conditioning)
Zingiber Officinale Root Extract
(Fragrance, Perfuming, Skin Conditioning, Tonic)
1
Phytosteryl Canola Glycerides
(Hair Conditioning, Skin Conditioning)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
B
Sodium PCA
(Hair Conditioning, Humectant, Antistatic Agent, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
1
A
Squalane
(Emollient, Hair Conditioning, Refatting, Skin Conditioning)
TOCOPHEROL
(Antioxidant, Fragrance, Skin Conditioning)
2
3
Lecithin
(Skin Conditioning, Emulsifying, Surfactant, Antistatic Agent, Emollient)
1
Linoleic Acid
(Fragrance, Hair Conditioning, Skin Conditioning, Sufactantsurfactant Cleansing Agent Is Included As A Function For The Soap Form Of Linoleic Acid., Antistatic Agent, Emollient)
Fungal Acne
Fungal Acne Trigger
1
A
Oleic Acid
(Fragrance, Sufactantsurfactant Cleansing Agent Is Included As A Function For The Soap Form Of Oleic Acid., Emollient, Emulsifying)
Fungal Acne
Fungal Acne Trigger
1
A
Palmitic Acid
(Fragrance, Opacifying, Sufactant, Surfactant Emulsifying Agentsurfactant Cleansing Agent Is Included As A Function For The Soap Form Of Palmitic Acid., Emollient)
Bad for Oily Skin
Bad for Oily Skin
Fungal Acne
Fungal Acne Trigger
1
A
Stearic Acid
(Fragrance, Sufactant, Emulsifying, Surfactantsurfactant Cleansing Agent Is Included As A Function For The Soap Form Of Stearic Acid., Emulsion Stabilising, Masking, Refatting)
Bad for Oily Skin
Bad for Oily Skin
Fungal Acne
Fungal Acne Trigger
1
A
Hydroxystearic Acid
(Cleansing, Emulsifying, Surfactant)
1
A
Triolein
(Viscosity Increasing Agent, Emollient, Refatting, Skin Conditioning, Solvent, Viscosity Controlling)
Bisabolol
(Fragrance, Skin Conditioning, Soothing)
1
B
Ethylhexyl Hydroxystearate
(Skin Conditioning, Emollient)
1
A
Ethoxydiglycol
(Fragrance, Solvent, Viscosity Decreasing Agent, Humectant, Perfuming)
1
A
Ethylhexylglycerin
(Deodorant, Skin Conditioning)
1
Water
(Solvent)
2
Mica
(Cosmetic Colorant, Opacifying)
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

Dimethicone
Skin Protecting, Emollient
Isononyl Isononanoate
Skin Conditioning, Emollient
Trisiloxane
Skin Conditioning
Cyclopentasiloxane
Skin Conditioning, Emollient
Coco-Caprylate/Caprate
Emollient, Skin Conditioning
Caprylic/Capric Triglyceride
Emollient, Skin Conditioning

Benefits

Good for dry skin

Concerns

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

Ingredients explained

C9-12 Alkane
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Isononyl Isononanoate
Skin conditioning, Emollient
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Skin conditioningEmollientAntistatic agent
Dimethyl Isosorbide
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
Trisiloxane
Antifoaming agent, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 2 Antifoaming agentSkin conditioning
Polysilicone-11
Film forming
Low-hazard ingredient.Read moreShow less
EWG 1 Film forming
Coco-Caprylate/Caprate
Emollient, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B EmollientSkin conditioning
Caprylic/Capric Triglyceride
Emollient, Masking
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmollientMaskingPerfumingSkin conditioningSolvent
Hydroxypinacolone Retinoate
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Palmitoyl Hexapeptide-14
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Ceramide NP
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Hair conditioningSkin conditioning
Helianthus Annuus Seed Extract
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Hordeum Vulgare Extract
Emollient, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 EmollientSkin conditioning
Cucumis Sativus Extract
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Laminaria Ochroleuca Extract
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Zingiber Officinale Root Extract
Fragrance, Perfuming
Limited public safety data.Read moreShow less
EWG N/A FragrancePerfumingSkin conditioningTonic
+ 12 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
Cyclopentasiloxane
Hair conditioning, Skin conditioning
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Hair conditioningSkin conditioningEmollientSolvent Silicone
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
Sodium PCA
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Hair conditioningHumectantAntistatic agentSkin conditioning Good for Dry Skin
Linoleic Acid
Fragrance, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 FragranceHair conditioningSkin conditioningSufactantsurfactant-cleansing agent is included as a function for the soap form of linoleic acid.Antistatic agentEmollient Fungal-acne trigger
Oleic Acid
Fragrance, Sufactantsurfactant-cleansing agent is included as a function for the soap form of oleic acid.
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSufactantsurfactant-cleansing agent is included as a function for the soap form of oleic acid.EmollientEmulsifying Fungal-acne trigger
Palmitic Acid
Fragrance, Opacifying
Potentially comedogenic - can block poresRead moreShow less
EWG 1 CIR A FragranceOpacifyingSufactantSurfactant -emulsifying agentsurfactant-cleansing agent is included as a function for the soap form of palmitic acid.Emollient Bad for Oily SkinFungal-acne trigger
Stearic Acid
Fragrance, Sufactant
Potentially comedogenic - can block poresRead moreShow less
EWG 1 CIR A FragranceSufactantEmulsifyingSurfactantsurfactant-cleansing agent is included as a function for the soap form of stearic acid.Emulsion stabilisingMaskingRefatting 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: Apply after toner and before moisturiser — thinnest to thickest.
  • 2 Evening: Use at night — start 2–3× a week and build up as your skin tolerates it.
  • 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.

Often avoided
Retinoids (Vitamin A) (Hydroxypinacolone Retinoate)

Topical retinoids (retinol, retinaldehyde, retinyl esters) are widely advised against in pregnancy as a precaution. The strongest evidence is for ORAL retinoids; topical absorption is low, but most clinicians err on the side of caution.

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.

Retinoids (Vitamin A) 0.01–1%

Most studied between 0.1% and 1%. Higher is not automatically better — irritation climbs with dose, so a well-formulated lower strength is often the sweet spot.

Hydroxypinacolone Retinoate

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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