15% Vitamin C Booster

One. Two. Free!

Where to buy Possibly in stock

About this product

The One. Two. Free! 15% Vitamin C Booster is a serums, essence, ampoule. Our analysis of its 32 ingredients (20 low-risk) rates it Excellent (96/100). 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
Serums, Essence, Ampoules
Ingredients
32
Low-risk
20
Fragrance
Fragrance-free
Origin
Germany

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 1/6
Good for dry skin
Glycerin
Caution for dry skin
Xanthan Gum Glycerin Terpineol Polyglyceryl-10 Laurate Sodium Hydroxide Alcohol Denat.
Oily/Acne-Prone Skin 1/0
Good for oily/acne-prone skin
Alcohol Denat.
Sensitive Skin 4/11
Good for sensitive skin
Ergothioneine Glycerin Ferulic Acid Lactobacillus/Portulaca Oleracea Ferment Extract
Caution for sensitive skin
Linalyl Acetate Algin Glycerin Terpineol Citric Acid Benzoic Acid Sodium Benzoate Alcohol Denat. Linalool Limonene Beta-Caryophyllene

Ingredients list

32 total
Lower hazard (1) Higher hazard (6)
All32 Skin Conditioning13 Fragrance10 Masking9 Solvent8 Perfuming7 Viscosity Controlling6 Emulsion Stabilising4 Antioxidant4
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
ASCORBIC ACID
(Antioxidant, Buffering, Fragrance, Skin Conditioning)
1
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
Dimethyl Isosorbide
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
Lactobacillus/Portulaca Oleracea Ferment Extract
(Antioxidant, Skin Conditioning)
1
A
Pentylene Glycol
(Skin Conditioning, Solvent)
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
4
Alcohol Denat.
(Antifoaming Agent, Antimicrobial, Astringent, Masking, Solvent, Viscosity Controlling)
Bad for Dry Skin
Bad for Dry Skin
Bad for Sensitive Skin
Bad for Sensitive Skin
Tricholoma Matsutake Mycelium Ferment Extract
(Humectant, Skin Protecting)
1
B
Polyglyceryl-10 Laurate
(Skin Conditioning, Emulsifying, Surfactant)
2
Ferulic Acid
(Antioxidant, Preservative, Uv Absorber, Antimicrobial)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
3
A
Sodium Benzoate
(Fragrance, Preservative, Anticorrosive, Masking)
3
A
Benzoic Acid
(Fragrance, Ph Adjuster, Preservative, Bulking Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
1
Lactobacillus Ferment
(Skin Conditioning)
Citrus Aurantifolia Peel Oil Distilled
(Perfuming)
lavandula angustifolia oil
(Fragrance, Tonic)
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
1
A
Sclerotium Gum
(Emulsion Stabilising, Skin Conditioning, Viscosity Increasing Agent, Viscosity Controlling)
6
Limonene
(Deodorant, Perfuming, Solvent)
Allergens
Allergens
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
1
Linalyl Acetate
(Fragrance, Masking)
5
Linalool
(Fragrance, Deodorant, Masking)
Allergens
Allergens
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
Terpinolene
(Perfuming)
1
Terpineol
(Denaturant, Masking, Perfuming, Solvent)
Pinene
(Antifoaming, Fragrance)
Alpha-Terpinene
(Perfuming)
Beta-Caryophyllene
(Masking, Perfuming, Skin Conditioning)
1
CI 15985
(Cosmetic Colorant)
1
A
Ethylhexylglycerin
(Deodorant, Skin Conditioning)
1
Ergothioneine
(Antioxidant)

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

ASCORBIC ACID
Antioxidant, Skin Conditioning
Lactobacillus/Portulaca Oleracea Ferment Extract
Antioxidant, Skin Conditioning
Pentylene Glycol
Skin Conditioning
Glycerin
Humectant, Skin Protecting
Alcohol Denat.
Astringent
Tricholoma Matsutake Mycelium Ferment Extract
Humectant, Skin Protecting

Benefits

Good for oily/acne-prone skin

Concerns

Contains eu allergen
Not fungal acne (malassezia) safe
May not suit dry skin
May not suit sensitive skin

Ingredients explained

Water
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
Propanediol
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
Dimethyl Isosorbide
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
Lactobacillus/Portulaca Oleracea Ferment Extract
Antioxidant, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A AntioxidantSkin conditioning
Pentylene Glycol
Skin conditioning, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningSolvent
Tricholoma Matsutake Mycelium Ferment Extract
Humectant, Skin protecting
Limited public safety data.Read moreShow less
EWG N/A HumectantSkin protecting
Polyglyceryl-10 Laurate
Skin conditioning, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Skin conditioningEmulsifyingSurfactant
Ferulic Acid
Antioxidant, Preservative
Low-hazard ingredient.Read moreShow less
EWG 2 AntioxidantPreservativeUv absorberAntimicrobial
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
Sodium Benzoate
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A FragrancePreservativeAnticorrosiveMasking
Lactobacillus Ferment
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Citrus Aurantifolia Peel Oil Distilled
Perfuming
Limited public safety data.Read moreShow less
EWG N/A Perfuming
lavandula angustifolia oil
Fragrance, Tonic
Limited public safety data.Read moreShow less
EWG N/A FragranceTonic
Sodium Hydroxide
Denaturant, Ph adjuster
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B DenaturantPh adjusterBuffering agent
+ 10 more — see the full ingredients list above
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
Alcohol Denat.
Antifoaming agent, Antimicrobial
Causes moisture evaporation - prone to dry out skinRead moreShow less
EWG 4 Antifoaming agentAntimicrobialAstringentMaskingSolventViscosity controlling Bad for Dry SkinBad for Sensitive Skin
Benzoic Acid
Fragrance, Ph adjuster
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A FragrancePh adjusterPreservativeBulking agentMasking Bad for Sensitive Skin
Limonene
Deodorant, Perfuming
Moderate-hazard ingredient.Read moreShow less
EWG 6 DeodorantPerfumingSolvent Allergens
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
Linalool
Fragrance, Deodorant
Moderate-hazard ingredient.Read moreShow less
EWG 5 FragranceDeodorantMasking Allergens
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

How to use

How to use

  • 1 Where it fits: Apply after toner and before moisturiser — thinnest to thickest.
  • 2 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.

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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