Niacinamide Glutathione Serum

One Thing

Where to buy Possibly in stock

About this product

The One Thing Niacinamide Glutathione Serum is a serums, essence, ampoule. Our analysis of its 33 ingredients (27 low-risk) rates it Excellent (100/100). Based on its ingredients, it looks well-suited to dry skin.

Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
33
Low-risk
27
Fragrance
Fragrance-free
Origin
South Korea

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 11/7
Good for dry skin
Glucose Linolenic Acid Linoleic Acid Oleic Acid Butylene Glycol Sodium Hyaluronate Glycerin Palmitic Acid Fructan Hydrolyzed Hyaluronic Acid Hyaluronic Acid
Caution for dry skin
Linolenic Acid Linoleic Acid Stearic Acid Oleic Acid Xanthan Gum Glycerin Palmitic Acid
Oily/Acne-Prone Skin No data
Sensitive Skin 4/10
Good for sensitive skin
Sodium Ascorbate Glycerin Hydroxyacetophenone Tocopheryl Acetate
Caution for sensitive skin
Citrus Unshiu Peel Extract Glutathione Linolenic Acid Linoleic Acid Stearic Acid Oleic Acid Butylene Glycol Glycerin Palmitic Acid Citric Acid

Ingredients list

33 total
Lower hazard (1) Higher hazard (3)
All33 Skin Conditioning28 Fragrance12 Humectant9 Solvent5 Hair Conditioning5 Antioxidant5 Masking4 Viscosity Controlling4
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
1
A
Butylene Glycol
(Fragrance, Skin Conditioning, Solvent, Viscositydecreasing Agent, Humectant, Masking, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
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
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
A
1,2-Hexanediol
(Solvent)
1
Hydroxyacetophenone
(Antioxidant)
1
Glycereth-25 PCA Isostearate
(Skin Conditioning, Emulsifying)
1
Coptis Japonica Root Extract
(Skin Conditioning)
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
1
A
Ethylhexylglycerin
(Deodorant, Skin Conditioning)
1
B
Citrus Unshiu Peel Extract
(Masking)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
Zea Mays Silk Extract
(Skin Conditioning)
1
A
Disodium EDTA
(Chelating Agent, Viscosity Controlling)
1
Glutathione
(Fragrance, Reducing)
1
A
Hyaluronic Acid
(Skin Conditioning, Viscosity Increasing Agent, Antistatic Agent, Humectant, Moisturising)
1
Hydrolyzed Hyaluronic Acid
(Hair Conditioning, Humectant, Skin Conditioning)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
Fructan
(Humectant, Skin Conditioning)
MELALEUCA ALTERNIFOLIA LEAF EXTRACT
(Perfuming, Skin Conditioning)
1
A
Glucose
(Flavoring Agent, Humectant, Skin Conditioning Agent Miscellaneous)
3-O-ETHYL ASCORBIC ACID
(Skin Conditioning)
ASCORBIC ACID
(Antioxidant, Buffering, Fragrance, Skin Conditioning)
1
A
Sodium Ascorbate
(Antioxidant)
3
Tocopheryl Acetate
(Antioxidant, Skin Conditioning)
Bad for Oily Skin
Bad for Oily Skin
1
Linoleic Acid
(Fragrance, Hair Conditioning, Skin Conditioning, Sufactantsurfactant Cleansing Agent Is Included As A Function For The Soap Form Of Linoleic Acid., Antistatic Agent, Emollient)
Fungal Acne
Fungal Acne Trigger
TOCOPHEROL
(Antioxidant, Fragrance, Skin Conditioning)
Helianthus Annuus Seed Oil
(Fragrance, Skin Conditioning, Skin Conditioning Emollient)
1
A
Oleic Acid
(Fragrance, Sufactantsurfactant Cleansing Agent Is Included As A Function For The Soap Form Of Oleic Acid., Emollient, Emulsifying)
Fungal Acne
Fungal Acne Trigger
1
A
Palmitic Acid
(Fragrance, Opacifying, Sufactant, Surfactant Emulsifying Agentsurfactant Cleansing Agent Is Included As A Function For The Soap Form Of Palmitic Acid., Emollient)
Bad for Oily Skin
Bad for Oily Skin
Fungal Acne
Fungal Acne Trigger
1
A
Stearic Acid
(Fragrance, Sufactant, Emulsifying, Surfactantsurfactant Cleansing Agent Is Included As A Function For The Soap Form Of Stearic Acid., Emulsion Stabilising, Masking, Refatting)
Bad for Oily Skin
Bad for Oily Skin
Fungal Acne
Fungal Acne Trigger
1
Linolenic Acid
(Fragrance, Hair Conditioning, Skin Conditioning, Sufactantsurfactant Cleansing Agent Is Included As A Function For The Soap Form Of Linolenic Acid., Antistatic Agent, Emollient, Perfuming)
Fungal Acne
Fungal Acne Trigger

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
Skin Conditioning
Butylene Glycol
Skin Conditioning, Humectant
Glycerin
Humectant, Skin Protecting
Hydroxyacetophenone
Antioxidant
Glycereth-25 PCA Isostearate
Skin Conditioning
Coptis Japonica Root Extract
Skin Conditioning

Benefits

Good for dry skin

Concerns

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

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Niacinamide
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningSmoothing
Propanediol
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
1,2-Hexanediol
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Solvent
Hydroxyacetophenone
Antioxidant
Low-hazard ingredient.Read moreShow less
EWG 1 Antioxidant
Glycereth-25 PCA Isostearate
Skin conditioning, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioningEmulsifying
Coptis Japonica Root Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Ethylhexylglycerin
Deodorant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A DeodorantSkin conditioning
Citrus Unshiu Peel Extract
Masking
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Masking
Xanthan Gum
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingSkin conditioningSurfactant -emulsifying agentViscosity increasing agentBindingGel formingViscosity controlling
Zea Mays Silk Extract
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Disodium EDTA
Chelating agent, Viscosity controlling
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Chelating agentViscosity controlling
Glutathione
Fragrance, Reducing
Low-hazard ingredient.Read moreShow less
EWG 1 FragranceReducing
Hyaluronic Acid
Skin conditioning, Viscosity increasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningViscosity increasing agentAntistatic agentHumectantMoisturising
Hydrolyzed Hyaluronic Acid
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 Hair conditioningHumectantSkin conditioning
+ 8 more — see the full ingredients list above
Butylene Glycol
Fragrance, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSkin conditioningSolventViscositydecreasing agentHumectantMaskingViscosity controlling Good for Dry Skin
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
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
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
Tocopheryl Acetate
Antioxidant, Skin conditioning
Potentially comedogenic - can block poresRead moreShow less
EWG 3 AntioxidantSkin conditioning Bad for Oily Skin
Linoleic Acid
Fragrance, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 FragranceHair conditioningSkin conditioningSufactantsurfactant-cleansing agent is included as a function for the soap form of linoleic acid.Antistatic agentEmollient Fungal-acne trigger
Oleic Acid
Fragrance, Sufactantsurfactant-cleansing agent is included as a function for the soap form of oleic acid.
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSufactantsurfactant-cleansing agent is included as a function for the soap form of oleic acid.EmollientEmulsifying Fungal-acne trigger
Palmitic Acid
Fragrance, Opacifying
Potentially comedogenic - can block poresRead moreShow less
EWG 1 CIR A FragranceOpacifyingSufactantSurfactant -emulsifying agentsurfactant-cleansing agent is included as a function for the soap form of palmitic acid.Emollient Bad for Oily SkinFungal-acne trigger
Stearic Acid
Fragrance, Sufactant
Potentially comedogenic - can block poresRead moreShow less
EWG 1 CIR A FragranceSufactantEmulsifyingSurfactantsurfactant-cleansing agent is included as a function for the soap form of stearic acid.Emulsion stabilisingMaskingRefatting Bad for Oily SkinFungal-acne trigger
Linolenic Acid
Fragrance, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 FragranceHair conditioningSkin conditioningSufactantsurfactant-cleansing agent is included as a function for the soap form of linolenic acid.Antistatic agentEmollientPerfuming Fungal-acne trigger

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.

3-O-ETHYL ASCORBIC ACID, ASCORBIC ACID, Sodium Ascorbate

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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