OS-01 Prep

Oneskin

Where to buy Possibly in stock

About this product

The Oneskin OS-01 Prep is a cleanser. Our analysis of its 16 ingredients (10 low-risk) rates it Excellent (97/100). 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
Cleansers
Ingredients
16
Low-risk
10
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

PH Level

(Know the PH? Submit it here! )

N/A - No submissions yet

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 2/2
Good for dry skin
Caprylyl Glycol Glycerin
Caution for dry skin
Glycerin Sodium Laurylglucosides Hydroxypropylsulfonate
Oily/Acne-Prone Skin No data
Sensitive Skin 2/4
Good for sensitive skin
Glycerin Hydrolyzed Opuntia Ficus-Indica Flower Extract
Caution for sensitive skin
Glycerin Sorbic Acid Phenoxyethanol Protium Heptaphyllum Resin

Ingredients list

16 total
Lower hazard (1) Higher hazard (4)
All16 Skin Conditioning9 Foam Boosting5 Hair Conditioning5 Humectant3 Fragrance3 Surfactant Cleansing2 Skin Protecting2 Sufactant2
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
Sodium Laurylglucosides Hydroxypropylsulfonate
(Cleansing, Emulsifying, Foam Boosting, Hydrotrope, Surfactant)
1
Cocamidopropyl Hydroxysultaine
(Antistatic Agent, Hair Conditioning, Skin Conditioning, Sufactant, Foam Boosting, Viscosity Increasing Agent, Viscosity Controlling)
1
Disodium Lauryl Sulfosuccinate
(Sufactant, Foam Boosting, Hydrotrope, Foaming, Skin Conditioning)
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
Sodium Hydroxypropylphosphate Laurylglucoside Crosspolymer
(Cleansing, Surfactant Cleansing, Surfactant Emulsifying, Surfactant Foam Boosting, Surfactant Hydrotrope)
Sodium Grapeseedamidopropyl Pg-Dimonium Chloride Phosphate
(Hair Conditioning, Skin Conditioning, Surfactant Cleansing)
1
Hydrolyzed Opuntia Ficus-Indica Flower Extract
(Abrasive, Skin Protecting)
Protium Heptaphyllum Resin
(Binding, Masking)
1
A
Caprylyl Glycol
(Hair Conditioning, Skin Conditioning, Emollient, Humectant)
4
A
Phenoxyethanol
(Fragrance, Preservative)
Paraben
Paraben
Lonicera Japonica Flower Extract
(Skin Conditioning)
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
3
A
Sorbic Acid
(Fragrance, Preservative)
Arnica Montana Extract
(Skin Conditioning)
1
Tetrasodium Glutamate Diacetate
(Chelating Agent)

My Ingredient Notes

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Key ingredients

Cocamidopropyl Hydroxysultaine
Skin Conditioning
Disodium Lauryl Sulfosuccinate
Skin Conditioning
Glycerin
Humectant, Skin Protecting
Sodium Grapeseedamidopropyl Pg-Dimonium Chloride Phosphate
Skin Conditioning
Hydrolyzed Opuntia Ficus-Indica Flower Extract
Skin Protecting
Caprylyl Glycol
Skin Conditioning, Emollient

Benefits

No standout benefits flagged for this product.

Concerns

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

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Sodium Laurylglucosides Hydroxypropylsulfonate
Cleansing, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 CleansingEmulsifyingFoam boostingHydrotropeSurfactant
Cocamidopropyl Hydroxysultaine
Antistatic agent, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Antistatic agentHair conditioningSkin conditioningSufactantFoam boostingViscosity increasing agentViscosity controlling
Disodium Lauryl Sulfosuccinate
Sufactant, Foam boosting
Low-hazard ingredient.Read moreShow less
EWG 1 SufactantFoam boostingHydrotropeFoamingSkin conditioning
Sodium Hydroxypropylphosphate Laurylglucoside Crosspolymer
Cleansing, Surfactant cleansing
Limited public safety data.Read moreShow less
EWG N/A CleansingSurfactant cleansingSurfactant emulsifyingSurfactant foam boostingSurfactant hydrotrope
Sodium Grapeseedamidopropyl Pg-Dimonium Chloride Phosphate
Hair conditioning, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Hair conditioningSkin conditioningSurfactant cleansing
Hydrolyzed Opuntia Ficus-Indica Flower Extract
Abrasive, Skin protecting
Low-hazard ingredient.Read moreShow less
EWG 1 AbrasiveSkin protecting
Protium Heptaphyllum Resin
Binding, Masking
Limited public safety data.Read moreShow less
EWG N/A BindingMasking
Caprylyl Glycol
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningEmollientHumectant
Lonicera Japonica Flower Extract
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Niacinamide
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningSmoothing
Sorbic Acid
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A FragrancePreservative
Arnica Montana Extract
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Tetrasodium Glutamate Diacetate
Chelating agent
Low-hazard ingredient.Read moreShow less
EWG 1 Chelating agent
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
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.

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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