Keratin Mousse

Syoss

Where to buy Possibly in stock

About this product

The Syoss Keratin Mousse is a emulsion. Our analysis of its 14 ingredients (10 low-risk) rates it Excellent (86/100). Heads up: it contains fragrance, which can irritate sensitive or reactive skin.

Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Emulsion
Ingredients
14
Low-risk
10
Fragrance
Contains fragrance
Origin
Japan

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 3/4
Good for dry skin
Propylene Glycol Hydrolyzed Keratin Lactic Acid
Caution for dry skin
Caprylyl/Capryl Glucoside Hydroxypropyl Starch Cetrimonium Chloride Sodium Hydroxide
Oily/Acne-Prone Skin No data
Sensitive Skin 0/4
Caution for sensitive skin
Propylene Glycol Sodium Benzoate Lactic Acid Butane

Ingredients list

14 total
Lower hazard (1) Higher hazard (7)
All14 Skin Conditioning7 Fragrance4 Humectant4 Antistatic Agent3 Hair Conditioning3 Preservative2 Buffering Agent2 Ph Adjuster2
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
Hydroxypropyl Starch
(Suspending Agent Nonsurfactant, Viscosity Increasing Agent, Viscosity Controlling)
7
A
Butane
(Propellant)
4
A
Propane
(Propellant)
1
A
Panthenol
(Antistatic Agent, Hair Conditioning, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
2
A
Hydrolyzed Keratin
(Hair Conditioning, Nail Conditioning Agent, Skin Conditioning, Antistatic Agent, Film Forming, Humectant)
4
B
Lactic Acid
(Exfoliant, Fragrance, Humectant, Ph Adjuster, Skin Conditioning Agent Humectant, Skin Conditioning, Buffering Agent)
Bad for Sensitive Skin
Bad for Sensitive Skin
3
B
Propylene Glycol
(Fragrance, Humectant, Skin Conditioningagent Miscellaneous, Solvent, Viscosity Decreasing Agent, Skin Conditioning, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
3
A
Sodium Benzoate
(Fragrance, Preservative, Anticorrosive, Masking)
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
3
B
Cetrimonium Chloride
(Antistatic Agent, Cosmetic Biocide, Emulsifying, Surfactant, Antimicrobial, Preservative)
PARFUM
(Fragrance, Perfuming)
1
Caprylyl/Capryl Glucoside
(Cleansing, Foaming, Surfactant)

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

Panthenol
Skin Conditioning
Niacinamide
Skin Conditioning
Hydrolyzed Keratin
Skin Conditioning, Humectant
Lactic Acid
Exfoliant, Humectant
Propylene Glycol
Humectant, Skin Conditioning

Benefits

Fungal-acne (Malassezia) safe

Concerns

Butane — 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
Hydroxypropyl Starch
Suspending agent - nonsurfactant, Viscosity increasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 Suspending agent - nonsurfactantViscosity increasing agentViscosity controlling
Propane
Propellant
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR A Propellant
Niacinamide
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningSmoothing
Hydrolyzed Keratin
Hair conditioning, Nail conditioning agent
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A Hair conditioningNail conditioning agentSkin conditioningAntistatic agentFilm formingHumectant
Sodium Benzoate
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A FragrancePreservativeAnticorrosiveMasking
Sodium Hydroxide
Denaturant, Ph adjuster
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B DenaturantPh adjusterBuffering agent
Cetrimonium Chloride
Antistatic agent, Cosmetic biocide
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B Antistatic agentCosmetic biocideEmulsifyingSurfactantAntimicrobialPreservative
PARFUM
Fragrance, Perfuming
Limited public safety data.Read moreShow less
EWG N/A FragrancePerfuming
Caprylyl/Capryl Glucoside
Cleansing, Foaming
Low-hazard ingredient.Read moreShow less
EWG 1 CleansingFoamingSurfactant
Butane
Propellant
Higher-hazard ingredient.Read moreShow less
EWG 7 CIR A Propellant
Panthenol
Antistatic agent, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antistatic agentHair conditioningSkin conditioning Good for Dry Skin
Lactic Acid
Exfoliant, Fragrance
Skin irritation can occur at high concentrationRead moreShow less
EWG 4 CIR B ExfoliantFragranceHumectantPh adjusterSkin-conditioning agent -humectantSkin conditioningBuffering agent Bad for Sensitive Skin
Propylene Glycol
Fragrance, Humectant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B FragranceHumectantSkin-conditioningagent - miscellaneousSolventViscosity decreasing agentSkin conditioningViscosity controlling Good for Dry Skin

How to use

How to use

  • 1 Evening, start slow: Best in the PM a few times a week to begin with; avoid layering with other strong actives the same night.
  • 2 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

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

AHA (acid exfoliant) 5–10% (OTC)

OTC leave-on AHAs are usually 5–10%. The effect also depends on pH and free-acid value, not the percentage alone.

Lactic Acid

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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