15% Vitamin C Booster
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.
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.
Summarised from our ingredient analysis — not brand marketing copy.
The evidence
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
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Water
(Solvent) |
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ASCORBIC ACID
(Antioxidant, Buffering, Fragrance, Skin Conditioning) |
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Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling) |
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Dimethyl Isosorbide
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling) |
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Lactobacillus/Portulaca Oleracea Ferment Extract
(Antioxidant, Skin Conditioning) |
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Pentylene Glycol
(Skin Conditioning, Solvent) |
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Glycerin
(Denaturant, Fragrance, Hair Conditioning, Humectant, Oral Care Agent, Oral Health Care Drug, Skin Protecting, Viscosity Decreasing Agent, Perfuming, Solvent) |
Good for Dry Skin
Fungal Acne Trigger
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Alcohol Denat.
(Antifoaming Agent, Antimicrobial, Astringent, Masking, Solvent, Viscosity Controlling) |
Bad for Dry Skin
Bad for Sensitive Skin
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Tricholoma Matsutake Mycelium Ferment Extract
(Humectant, Skin Protecting) |
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Polyglyceryl-10 Laurate
(Skin Conditioning, Emulsifying, Surfactant) |
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Ferulic Acid
(Antioxidant, Preservative, Uv Absorber, Antimicrobial) |
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Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling) |
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Sodium Benzoate
(Fragrance, Preservative, Anticorrosive, Masking) |
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Benzoic Acid
(Fragrance, Ph Adjuster, Preservative, Bulking Agent, Masking) |
Bad for Sensitive Skin
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Lactobacillus Ferment
(Skin Conditioning) |
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Citrus Aurantifolia Peel Oil Distilled
(Perfuming) |
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lavandula angustifolia oil
(Fragrance, Tonic) |
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Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent) |
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Sclerotium Gum
(Emulsion Stabilising, Skin Conditioning, Viscosity Increasing Agent, Viscosity Controlling) |
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Limonene
(Deodorant, Perfuming, Solvent) |
Allergens
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Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking) |
Bad for Sensitive Skin
|
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Linalyl Acetate
(Fragrance, Masking) |
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Linalool
(Fragrance, Deodorant, Masking) |
Allergens
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Algin
(Binding Agent, Fragrance, Viscosity Increasing Agent, Binding, Masking, Viscosity Controlling) |
Bad for Sensitive Skin
Bad for Oily Skin
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Terpinolene
(Perfuming) |
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Terpineol
(Denaturant, Masking, Perfuming, Solvent) |
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Pinene
(Antifoaming, Fragrance) |
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Alpha-Terpinene
(Perfuming) |
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Beta-Caryophyllene
(Masking, Perfuming, Skin Conditioning) |
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CI 15985
(Cosmetic Colorant) |
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Ethylhexylglycerin
(Deodorant, Skin Conditioning) |
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Ergothioneine
(Antioxidant) |
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How to use
General guidance from this product's category and active ingredients — always follow the directions on the package.
Trust & honesty
The concentrations these actives are typically effective at in research — not a measurement of this product.
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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