Master Patch X-Large

CosRX

Where to buy Possibly in stock

About this product

The CosRX Master Patch X-Large is a treatment. Our analysis of its 6 ingredients (5 low-risk) rates it Excellent (100/100). Based on its ingredients, it looks well-suited to sensitive skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Treatments
Ingredients
6
Low-risk
5
Fragrance
Fragrance-free
Origin
South Korea
Data updated
May 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 1/1
Good for sensitive skin
Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate
Caution for sensitive skin
Cellulose Gum

Ingredients list

6 total
Lower hazard (1) Higher hazard (1)
All6 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
Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate
(Antioxidant)
1
A
Polyisobutene
(Binding Agent, Film Forming, Viscosity Increasing Agent, Binding, Viscosity Controlling)
1
A
Styrene/Isoprene Copolymer
(Film Forming, Opacifying)
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)

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
Strengthens, smooths, and brightens skin.
Antioxidants
Shields skin from free radical damage.
Exfoliators
Removes dead skin cells to smoothe texture.

Benefits

Acne FightingFights acne and helps prevent breakouts.
Anti-AgingSoftens lines and helps skin look youthful.
BrighteningRestores radiance to dull, tired skin.
Reduces IrritationEases discomfort and supports skin resilience.
Good For Oily SkinBalances oil and helps reduce shine.
Reduces Large PoresMinimizes the look of enlarged pores.
Redness ReducingSoothes visible redness and calms irritation.
Scar HealingImproves the look of marks and scars.

Concerns

No major concerns flagged

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
Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate
Antioxidant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antioxidant
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
Niacinamide
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningSmoothing
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.

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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