Smooth Proof Shampoo

Biolage

Where to buy Possibly in stock

About this product

The Biolage Smooth Proof Shampoo is a misc. Our analysis of its 29 ingredients (19 low-risk) rates it Excellent (82/100). Based on its ingredients, it looks well-suited to oily / acne-prone skin. Heads up: it contains fragrance, which can irritate sensitive or reactive skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Misc
Ingredients
29
Low-risk
19
Fragrance
Contains fragrance
Origin
United States
Data updated
May 2026

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 4/9
Good for dry skin
Methyl Cocoate Camellia Kissi Seed Oil Glycerin Propylene Glycol
Caution for dry skin
Sodium Cocoate Glycerin Salicylic Acid Laureth-5 Carboxylic Acid Sodium Laureth Sulfate Sodium Hydroxide PEG-55 Propylene Glycol Oleate PEG-60 Hydrogenated Castor Oil PPG-5-Ceteth-20
Oily/Acne-Prone Skin 1/0
Good for oily/acne-prone skin
Salicylic Acid
Sensitive Skin 1/15
Good for sensitive skin
Glycerin
Caution for sensitive skin
Sodium Chloride Glycerin Propylene Glycol Salicylic Acid Citric Acid Sodium Benzoate PEG-60 Hydrogenated Castor Oil Linalool Benzyl Alcohol Hexyl Cinnamal Limonene Butylphenyl Methylpropional Coumarin Hydroxycitronellal Amyl Cinnamal

Ingredients list

29 total
Lower hazard (1) Higher hazard (7)
All29 Fragrance12 Masking9 Skin Conditioning9 Surfactant6 Perfuming5 Viscosity Controlling5 Solvent5 Emulsifying5
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
3
Sodium Laureth Sulfate
(Cleansing, Emulsifying, Foaming, Surfactant)
Bad for Oily Skin
Bad for Oily Skin
Sulfate
Sulfate
1
B
Coco-Betaine
(Antistatic Agent, Hair Conditioning, Skin Conditioning, Sufactant, Foam Boosting, Viscosity Increasing Agent, Viscosity Controlling)
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
1
Sodium Chloride
(Bulking Agent, Masking, Oral Care Agent, Viscosity Controlling)
1
A
Amodimethicone
(Antistatic Agent, Hair Conditioning)
Silicone
Silicone
1
Cocamide MIPA
(Foam Boosting, Viscosity Increasing Agent, Emulsifying, Emulsion Stabilising, Viscosity Controlling)
2
Laureth-5 Carboxylic Acid
(Cleansing, Emulsifying, Surfactant)
1
A
Polyquaternium-10
(Antistatic Agent, Film Forming, Hair Fixing)
3
B
PPG-5-Ceteth-20
(Emulsifying, Surfactant)
PARFUM
(Fragrance, Perfuming)
3
A
Sodium Benzoate
(Fragrance, Preservative, Anticorrosive, Masking)
3
A
PEG-55 Propylene Glycol Oleate
(Sufactant, Surfactant, Viscosity Controlling)
3
B
PEG-60 Hydrogenated Castor Oil
(Fragrance, Sufactant, Surfactant)
Fungal Acne
Fungal Acne Trigger
4
B
Salicylic Acid
(Antiacne Agent, Antidandruff Agent, Corn/Callus/Wart Remover, Denaturant, Exfoliant, Fragrance, Hair Conditioning, Skin Conditioning, Keratolytic, Masking, Preservative)
Good for Oily Skin
Good for Oily Skin
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
1
A
Camellia Kissi Seed Oil
(Skin Conditioning, Emollient)
6
Limonene
(Deodorant, Perfuming, Solvent)
Allergens
Allergens
5
Hexyl Cinnamal
(Fragrance, Masking)
Allergens
Allergens
7
Coumarin
(Fragrance, Masking)
Allergens
Allergens
5
Linalool
(Fragrance, Deodorant, Masking)
Allergens
Allergens
7
Butylphenyl Methylpropional
(Perfuming)
Allergens
Allergens
1
A
Methyl Cocoate
(Skin Conditioning, Emollient)
Fungal Acne
Fungal Acne Trigger
5
A
Benzyl Alcohol
(External Analgesic, Fragrance, Oral Health Care Drug, Preservative, Solvent, Viscosity Decreasing Agent, Masking)
Allergens
Allergens
7
Hydroxycitronellal
(Fragrance, Masking)
Allergens
Allergens
Amyl Cinnamal
(Perfuming)
Allergens
Allergens
1
A
Sodium Cocoate
(Cleansing, Emulsifying, Surfactant)
Fungal Acne
Fungal Acne Trigger
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin

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

BHA
Unclogs pores and reduces excess oil.

Benefits

HydratingBoosts hydration and relieves dry, tight skin.
Acne FightingFights acne and helps prevent breakouts.
BrighteningRestores radiance to dull, tired skin.
Good For Oily SkinBalances oil and helps reduce shine.
Reduces Large PoresMinimizes the look of enlarged pores.
Scar HealingImproves the look of marks and scars.
Skin TextureSmooths rough patches and refines texture.
Barrier RepairStrengthen and restore your skin's natural barrier.

Concerns

Contains sulfate
Contains silicone
Contains eu allergen
Not fungal acne (malassezia) safe
Coumarin — higher EWG
Butylphenyl Methylpropional — higher EWG
Hydroxycitronellal — higher EWG
May not suit dry 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
Coco-Betaine
Antistatic agent, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Antistatic agentHair conditioningSkin conditioningSufactantFoam boostingViscosity increasing agentViscosity controlling
Sodium Chloride
Bulking agent, Masking
Low-hazard ingredient.Read moreShow less
EWG 1 Bulking agentMaskingOral care agentViscosity controlling
Cocamide MIPA
Foam boosting, Viscosity increasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 Foam boostingViscosity increasing agentEmulsifyingEmulsion stabilisingViscosity controlling
Laureth-5 Carboxylic Acid
Cleansing, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 2 CleansingEmulsifyingSurfactant
Polyquaternium-10
Antistatic agent, Film forming
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antistatic agentFilm formingHair fixing
PPG-5-Ceteth-20
Emulsifying, Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B EmulsifyingSurfactant
PARFUM
Fragrance, Perfuming
Limited public safety data.Read moreShow less
EWG N/A FragrancePerfuming
Sodium Benzoate
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A FragrancePreservativeAnticorrosiveMasking
PEG-55 Propylene Glycol Oleate
Sufactant, Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A SufactantSurfactantViscosity controlling
Camellia Kissi Seed Oil
Skin conditioning, Emollient
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningEmollient
Sodium Hydroxide
Denaturant, Ph adjuster
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B DenaturantPh adjusterBuffering agent
Sodium Laureth Sulfate
Cleansing, Emulsifying
Potentially comedogenic - can block poresRead moreShow less
EWG 3 CleansingEmulsifyingFoamingSurfactant Bad for Oily SkinSulfate
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
Amodimethicone
Antistatic agent, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antistatic agentHair conditioning Silicone
PEG-60 Hydrogenated Castor Oil
Fragrance, Sufactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B FragranceSufactantSurfactant Fungal-acne trigger
Salicylic Acid
Antiacne agent, Antidandruff agent
Skin irritation can occur at high concentrationRead moreShow less
EWG 4 CIR B Antiacne agentAntidandruff agentCorn/callus/wart removerDenaturantExfoliantFragranceHair conditioningSkin conditioningKeratolyticMaskingPreservative Good for Oily SkinBad 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
Limonene
Deodorant, Perfuming
Moderate-hazard ingredient.Read moreShow less
EWG 6 DeodorantPerfumingSolvent Allergens
Hexyl Cinnamal
Fragrance, Masking
Moderate-hazard ingredient.Read moreShow less
EWG 5 FragranceMasking Allergens
Coumarin
Fragrance, Masking
Higher-hazard ingredient.Read moreShow less
EWG 7 FragranceMasking Allergens
Linalool
Fragrance, Deodorant
Moderate-hazard ingredient.Read moreShow less
EWG 5 FragranceDeodorantMasking Allergens
Butylphenyl Methylpropional
Perfuming
Higher-hazard ingredient.Read moreShow less
EWG 7 Perfuming Allergens
Methyl Cocoate
Skin conditioning, Emollient
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningEmollient Fungal-acne trigger
Benzyl Alcohol
External analgesic, Fragrance
Moderate-hazard ingredient.Read moreShow less
EWG 5 CIR A External analgesicFragranceOral health care drugPreservativeSolventViscosity decreasing agentMasking Allergens
Hydroxycitronellal
Fragrance, Masking
Higher-hazard ingredient.Read moreShow less
EWG 7 FragranceMasking Allergens
Amyl Cinnamal
Perfuming
Limited public safety data.Read moreShow less
EWG N/A Perfuming Allergens
+ 2 more — see the full ingredients list above

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

Pregnancy & breastfeeding

Contains ingredients some choose to avoid or double-check while pregnant or nursing.

Use with caution
BHA (salicylic) (Salicylic Acid)

Low-strength topical salicylic acid (BHA) is generally considered fine. Caution is usually reserved for high-strength leave-on products and salicylic peels.

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.

BHA (salicylic) 0.5–2%

Salicylic acid is OTC-capped at 2%; 0.5–2% is the usual leave-on range. Much below that it acts more as a soothing agent than an exfoliant.

Salicylic 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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