Master Patch Basic

CosRX

Where to buy Possibly in stock

About this product

The CosRX Master Patch Basic is a treatment. Our analysis of its 4 ingredients (3 low-risk) rates it Excellent (100/100).

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Treatments
Ingredients
4
Low-risk
3
Fragrance
Fragrance-free
Origin
South Korea
Data updated
Jun 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 No data
Oily/Acne-Prone Skin No data
Sensitive Skin 0/1
Caution for sensitive skin
Cellulose Gum

Ingredients list

4 total
Lower hazard (1) Higher hazard (1)
All4 Film Forming6 Viscosity Controlling3 Binding Agent2 Emulsion Stabilising2 Viscosity Increasing Agent2 Binding2 Fragrance1 Masking1
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
A
Cellulose Gum
(Binding Agent, Emulsion Stabilising, Film Forming, Fragrance, Viscosity Increasing Agent, Binding, Masking, Viscosity Controlling)
Hydrogenated Poly(C6-20 Olefin)
(Abrasive, Viscosity Controlling)
1
A
Polyisobutene
(Binding Agent, Film Forming, Viscosity Increasing Agent, Binding, Viscosity Controlling)
1
A
Styrene/Isoprene Copolymer
(Film Forming, 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

Exfoliators
Removes dead skin cells to smoothe texture.

Benefits

Fungal-acne (Malassezia) safe

Concerns

May not suit sensitive skin

Ingredients explained

Cellulose Gum
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingFilm formingFragranceViscosity increasing agentBindingMaskingViscosity controlling
Hydrogenated Poly(C6-20 Olefin)
Abrasive, Viscosity controlling
Limited public safety data.Read moreShow less
EWG N/A AbrasiveViscosity controlling
Polyisobutene
Binding agent, Film forming
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentFilm formingViscosity increasing agentBindingViscosity controlling
Styrene/Isoprene Copolymer
Film forming, Opacifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Film formingOpacifying
No flagged concerns — nice!

How to use

How to use

  • 1 Where it fits: Apply after toner and before moisturiser — thinnest to thickest.
  • 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.

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