Melaquest Cysteamine Serum

Dermaquest

Where to buy Possibly in stock

About this product

The Dermaquest Melaquest Cysteamine Serum is a serums, essence, ampoule. Our analysis of its 24 ingredients (20 low-risk) rates it Excellent (98/100). Based on its ingredients, it looks well-suited to dry skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
24
Low-risk
20
Fragrance
Fragrance-free
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 4/4
Good for dry skin
Ethoxydiglycol Caprylyl Glycol Glycerin Propylene Glycol
Caution for dry skin
Cyclodextrin Glycerin Hexylene Glycol Polysorbate 20
Oily/Acne-Prone Skin No data
Sensitive Skin 2/9
Good for sensitive skin
Cysteamine HCl Glycerin
Caution for sensitive skin
Sodium Citrate Algin Ethoxydiglycol Glycerin Propylene Glycol Hexylene Glycol Sodium Benzoate Potassium Sorbate Phenoxyethanol

Ingredients list

24 total
Lower hazard (1) Higher hazard (4)
All24 Skin Conditioning11 Fragrance9 Solvent6 Humectant6 Viscosity Decreasing Agent4 Preservative3 Viscosity Controlling3 Chelating Agent3
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
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
Isopentyldiol
(Solvent)
ASCORBIC ACID
(Antioxidant, Buffering, Fragrance, Skin Conditioning)
1
A
Ethoxydiglycol
(Fragrance, Solvent, Viscosity Decreasing Agent, Humectant, Perfuming)
Acetyl Glycyl Beta-Alanine
(Skin Conditioning)
3
A
Aminomethyl Propanol
(Ph Adjuster, Buffering Agent)
3
B
Polysorbate 20
(Emulsifying, Surfactant)
Fungal Acne
Fungal Acne Trigger
3
A
PEG-8 Dimethicone
(Hair Conditioning, Skin Conditioning)
1
Ginkgo Biloba Leaf Extract
(Skin Conditioning)
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
A
Sodium Citrate
(Ph Adjuster, Buffering Agent, Chelating, Masking)
1
Cysteamine HCl
(Hair Waving Or Straightening, Reducing, Antioxidant)
1
A
Cyclodextrin
(Absorbent, Chelating Agent)
1
A
Algin
(Binding Agent, Fragrance, Viscosity Increasing Agent, Binding, Masking, Viscosity Controlling)
Bad for Sensitive Skin
Bad for Sensitive Skin
Bad for Oily Skin
Bad for Oily Skin
A
Calcium Citrate
(Buffering Agent)
1
A
Disodium EDTA
(Chelating Agent, Viscosity Controlling)
1
Phytic Acid
(Chelating Agent, Oral Care Agent)
1
A
Caprylyl Glycol
(Hair Conditioning, Skin Conditioning, Emollient, Humectant)
1
A
Ethylhexylglycerin
(Deodorant, Skin Conditioning)
1
A
Hexylene Glycol
(Fragrance, Solvent, Viscosity Decreasing Agent, Emulsifying, Perfuming, Skin Conditioning, Surfactant)
4
A
Phenoxyethanol
(Fragrance, Preservative)
Paraben
Paraben
3
A
Sodium Benzoate
(Fragrance, Preservative, Anticorrosive, Masking)
3
A
Potassium Sorbate
(Fragrance, Preservative)

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

Antioxidants
Shields skin from free radical damage.
Vitamin C
Brightens, evens tone, and supports collagen.

Benefits

HydratingBoosts hydration and relieves dry, tight skin.
Scar HealingImproves the look of marks and scars.
Anti-AgingSoftens lines and helps skin look youthful.
BrighteningRestores radiance to dull, tired skin.
Reduces IrritationEases discomfort and supports skin resilience.
Redness ReducingSoothes visible redness and calms irritation.
Dark SpotsFades dark spots for even skin tone.
Skin TextureSmooths rough patches and refines texture.

Concerns

Contains paraben
Not fungal acne (malassezia) safe
May not suit sensitive skin

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Isopentyldiol
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
ASCORBIC ACID
Antioxidant, Buffering
Limited public safety data.Read moreShow less
EWG N/A AntioxidantBufferingFragranceSkin conditioning
Ethoxydiglycol
Fragrance, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSolventViscosity decreasing agentHumectantPerfuming
Acetyl Glycyl Beta-Alanine
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Aminomethyl Propanol
Ph adjuster, Buffering agent
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Ph adjusterBuffering agent
PEG-8 Dimethicone
Hair conditioning, Skin conditioning
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Hair conditioningSkin conditioning
Ginkgo Biloba Leaf Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Sodium Citrate
Ph adjuster, Buffering agent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Ph adjusterBuffering agentChelatingMasking
Cysteamine HCl
Hair waving or straightening, Reducing
Low-hazard ingredient.Read moreShow less
EWG 1 Hair waving or straighteningReducingAntioxidant
Cyclodextrin
Absorbent, Chelating agent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A AbsorbentChelating agent
Calcium Citrate
Buffering agent
Limited public safety data.Read moreShow less
EWG N/A CIR A Buffering agent
Disodium EDTA
Chelating agent, Viscosity controlling
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Chelating agentViscosity controlling
Phytic Acid
Chelating agent, Oral care agent
Low-hazard ingredient.Read moreShow less
EWG 1 Chelating agentOral care agent
Caprylyl Glycol
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningEmollientHumectant
+ 4 more — see the full ingredients list above
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
Polysorbate 20
Emulsifying, Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B EmulsifyingSurfactant Fungal-acne trigger
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
Algin
Binding agent, Fragrance
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentFragranceViscosity increasing agentBindingMaskingViscosity controlling Bad for Sensitive SkinBad for Oily Skin
Phenoxyethanol
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR A FragrancePreservative Paraben

How to use

How to use

  • 1 Where it fits: Apply after toner and before moisturiser — thinnest to thickest.
  • 2 Morning works well: Antioxidants like vitamin C pair well with daytime use under sunscreen.

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.

Vitamin C (ascorbic) 5–20%

L-ascorbic acid is usually used at 5–20% (around 10–15% is common). Above ~20% adds little and tends to irritate more; it also needs a low pH to work.

ASCORBIC 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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