System 4 Scalp + Hair Conditioner

Nioxin

System 4 Scalp + Hair Conditioner

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About this product

The Nioxin System 4 Scalp + Hair Conditioner is a misc. Our analysis of its 44 ingredients (29 low-risk) rates it Excellent (90/100). Based on its ingredients, it looks well-suited to oily / acne-prone skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Misc
Ingredients
44
Low-risk
29
Fragrance
Fragrance-free
Origin
Canada

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 8/9
Good for dry skin
Glyceryl Stearate Cetearyl Alcohol Cetyl Alcohol Stearyl Alcohol Oleyl Alcohol Propylene Glycol Camellia Sinensis Leaf Extract Lecithin
Caution for dry skin
Maltodextrin Cetyl Alcohol Stearamidopropyl Dimethylamine Stearyl Alcohol Hydroxypropyl Guar Camellia Sinensis Leaf Extract Polysorbate 60 Lecithin Vaccinium Myrtillus Leaf Extract
Oily/Acne-Prone Skin 2/0
Good for oily/acne-prone skin
Camellia Sinensis Leaf Extract Vaccinium Myrtillus Leaf Extract
Sensitive Skin 2/17
Good for sensitive skin
Camellia Sinensis Leaf Extract Tocopheryl Acetate
Caution for sensitive skin
Disodium Phosphate Cetyl Alcohol Stearyl Alcohol Oleyl Alcohol Propylene Glycol Citric Acid Camellia Sinensis Leaf Extract Sodium Benzoate Potassium Sorbate Methylparaben Ethylparaben Phenoxyethanol Benzyl Alcohol Limonene Butylparaben Propylparaben Mentha Arvensis Leaf Oil

Ingredients list

44 total
Lower hazard (1) Higher hazard (7)
All44 Skin Conditioning22 Fragrance16 Emulsion Stabilising12 Masking9 Emulsifying8 Preservative8 Hair Conditioning8 Viscosity Increasing Agent7
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
A
Cetyl Alcohol
(Emulsion Stabilising, Fragrance, Opacifying, Emulsifying, Surfactant, Foam Boosting, Viscosity Increasing Agent, Emollient, Masking, Viscosity Controlling)
1
B
Stearamidopropyl Dimethylamine
(Antistatic Agent, Emulsifying, Hair Conditioning, Surfactant)
1
A
Stearyl Alcohol
(Emulsion Stabilising, Fragrance, Emulsifying, Surfactant, Foambooster, Viscosity Increasing Agent, Emollient, Foam Boosting, Masking, Opacifying, Refatting, Viscosity Controlling)
3
Distearyldimonium Chloride
(Antistatic Agent, Hair Conditioning)
4
A
Phenoxyethanol
(Fragrance, Preservative)
Paraben
Paraben
5
A
Benzyl Alcohol
(External Analgesic, Fragrance, Oral Health Care Drug, Preservative, Solvent, Viscosity Decreasing Agent, Masking)
Allergens
Allergens
1
A
Cetearyl Alcohol
(Emulsion Stabilising, Opacifying, Foam Boosting, Viscosity Increasingagent Aqueous, Viscosity Increasing Agent, Emollient, Emulsifying, Viscosity Controlling)
1
A
Hydroxypropyl Guar
(Binding Agent, Emulsion Stabilising, Film Forming, Viscosity Increasing Agent, Antistatic Agent, Binding, Surfactant, Viscosity Controlling)
1
A
Glyceryl Stearate
(Emollient, Emulsifying)
Fungal Acne
Fungal Acne Trigger
1
A
Oleyl Alcohol
(Fragrance, Skin Conditioning, Emollient, Solvent, Viscosity Increasingagent Nonaqueous, Emulsifying, Opacifying, Viscosity Controlling)
Bad for Oily Skin
Bad for Oily Skin
Mentha Piperita Oil
(Fragrance, Perfuming, Refreshing, Tonic)
Mentha Arvensis Leaf Oil
(Masking)
7
A
Propylparaben
(Fragrance, Preservative, Perfuming)
Paraben
Paraben
3
B
Polysorbate 60
(Emulsifying, Surfactant)
Fungal Acne
Fungal Acne Trigger
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
4
A
Methylparaben
(Fragrance, Preservative)
Paraben
Paraben
2
A
EDTA
(Chelating Agent)
1
A
Hydroxyethylcellulose
(Binding Agent, Emulsion Stabilising, Film Forming, Viscosity Increasing Agent, Binding, Stabilising, Viscosity Controlling)
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
1
Quaternium-80
(Antistatic Agent, Hair Conditioning)
6
Limonene
(Deodorant, Perfuming, Solvent)
Allergens
Allergens
1
B
Camellia Sinensis Leaf Extract
(Antimicrobial, Antioxidant, Astringent, Emollient, Humectant, Masking, Oral Care Agent, Skin Conditioning, Skin Protecting, Tonic, Uv Absorber)
Good for Oily Skin
Good for Oily Skin
1
Cystine Bis-PG-Propyl Silanetriol
(Skin Conditioning)
3
Tocopheryl Acetate
(Antioxidant, Skin Conditioning)
Bad for Oily Skin
Bad for Oily Skin
2
3
Lecithin
(Skin Conditioning, Emulsifying, Surfactant, Antistatic Agent, Emollient)
1
A
Biotin
(Hair Conditioning, Skin Conditioning, Antiseborrhoeic)
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)
Foeniculum Vulgare Fruit Extract
(Skin Conditioning, Skin Conditioning Emollient, Soothing, Tonic)
1
B
Disodium Phosphate
(Buffering Agent, Anticorrosive, Fragrance, Ph Adjuster, Masking)
Acer saccharum extract
(Skin Conditioning)
Vaccinium Myrtillus Leaf Extract
(Astringent, Hair Conditioning, Nail Conditioning, Skin Conditioning)
citrus limon peel extract
(Skin Conditioning, Skin Conditioning Emollient, Skin Protecting, Tonic)
Saccharum Officinarum Extract
(Moisturising, Skin Conditioning)
1
Yeast Extract
(Skin Conditioning)
1
B
Sodium Phosphate
(Buffering Agent)
Citrus Aurantium Dulcis Fruit Extract
(Fragrance, Skin Conditioning)
1
A
Maltodextrin
(Absorbent, Binding Agent, Emulsion Stabilising, Film Forming, Hair Conditioning, Skin Conditioning, Suspending Agent Nonsurfactant, Binding)
2
CI 42090
(Colorant, Cosmetic Colorant)
3
A
Potassium Sorbate
(Fragrance, Preservative)
3
A
Sodium Benzoate
(Fragrance, Preservative, Anticorrosive, Masking)
4
A
Ethylparaben
(Fragrance, Preservative)
Paraben
Paraben
7
A
Butylparaben
(Fragrance, Preservative, Masking)
Paraben
Paraben

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

Cetyl Alcohol
Emollient
Stearyl Alcohol
Emollient
Cetearyl Alcohol
Emollient
Glyceryl Stearate
Emollient
Oleyl Alcohol
Skin Conditioning, Emollient
Propylene Glycol
Humectant, Skin Conditioning

Benefits

Good for oily/acne-prone skin

Concerns

Contains paraben
Contains eu allergen
Not fungal acne (malassezia) safe
Propylparaben — higher EWG
Butylparaben — 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
Cetyl Alcohol
Emulsion stabilising, Fragrance
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Emulsion stabilisingFragranceOpacifyingEmulsifyingSurfactantFoam boostingViscosity increasing agentEmollientMaskingViscosity controlling
Stearamidopropyl Dimethylamine
Antistatic agent, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Antistatic agentEmulsifyingHair conditioningSurfactant
Stearyl Alcohol
Emulsion stabilising, Fragrance
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Emulsion stabilisingFragranceEmulsifyingSurfactant- foamboosterViscosity increasing agentEmollientFoam boostingMaskingOpacifyingRefattingViscosity controlling
Distearyldimonium Chloride
Antistatic agent, Hair conditioning
Low-to-moderate hazard.Read moreShow less
EWG 3 Antistatic agentHair conditioning
Cetearyl Alcohol
Emulsion stabilising, Opacifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Emulsion stabilisingOpacifyingFoam boostingViscosity increasingagent - aqueousViscosity increasing agentEmollientEmulsifyingViscosity controlling
Hydroxypropyl Guar
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingFilm formingViscosity increasing agentAntistatic agentBindingSurfactantViscosity controlling
Mentha Piperita Oil
Fragrance, Perfuming
Limited public safety data.Read moreShow less
EWG N/A FragrancePerfumingRefreshingTonic
Mentha Arvensis Leaf Oil
Masking
Limited public safety data.Read moreShow less
EWG N/A Masking
EDTA
Chelating agent
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A Chelating agent
Hydroxyethylcellulose
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingFilm formingViscosity increasing agentBindingStabilisingViscosity controlling
Quaternium-80
Antistatic agent, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Antistatic agentHair conditioning
Cystine Bis-PG-Propyl Silanetriol
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Lecithin
Skin conditioning, Emulsifying
Low-to-moderate hazard.Read moreShow less
EWG 2–3 Skin conditioningEmulsifyingSurfactantAntistatic agentEmollient
Biotin
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningAntiseborrhoeic
+ 14 more — see the full ingredients list above
Phenoxyethanol
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR A FragrancePreservative Paraben
Benzyl Alcohol
External analgesic, Fragrance
Moderate-hazard ingredient.Read moreShow less
EWG 5 CIR A External analgesicFragranceOral health care drugPreservativeSolventViscosity decreasing agentMasking Allergens
Glyceryl Stearate
Emollient, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmollientEmulsifying Fungal-acne trigger
Oleyl Alcohol
Fragrance, Skin conditioning
Potentially comedogenic - can block poresRead moreShow less
EWG 1 CIR A FragranceSkin conditioningEmollientSolventViscosity increasingagent - nonaqueousEmulsifyingOpacifyingViscosity controlling Bad for Oily Skin
Propylparaben
Fragrance, Preservative
Higher-hazard ingredient.Read moreShow less
EWG 7 CIR A FragrancePreservativePerfuming Paraben
Polysorbate 60
Emulsifying, Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B EmulsifyingSurfactant Fungal-acne trigger
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
Methylparaben
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR A FragrancePreservative Paraben
Citric Acid
Chelating agent, Fragrance
Skin irritation can occur at high concentrationRead moreShow less
EWG 2 CIR A Chelating agentFragrancePh adjusterBuffering agentMasking Bad for Sensitive Skin
Limonene
Deodorant, Perfuming
Moderate-hazard ingredient.Read moreShow less
EWG 6 DeodorantPerfumingSolvent Allergens
Camellia Sinensis Leaf Extract
Antimicrobial, Antioxidant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B AntimicrobialAntioxidantAstringentEmollientHumectantMaskingOral care agentSkin conditioningSkin protectingTonicUv absorber Good for Oily Skin
Tocopheryl Acetate
Antioxidant, Skin conditioning
Potentially comedogenic - can block poresRead moreShow less
EWG 3 AntioxidantSkin conditioning Bad for Oily Skin
Panthenol
Antistatic agent, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antistatic agentHair conditioningSkin conditioning Good for Dry Skin
Ethylparaben
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR A FragrancePreservative Paraben
Butylparaben
Fragrance, Preservative
Higher-hazard ingredient.Read moreShow less
EWG 7 CIR A FragrancePreservativeMasking Paraben

How to use

How to use

  • 1 Morning only: Apply as the last step of your AM routine, after moisturiser, and reapply every ~2 hours of sun exposure.

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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