Koi Gokujyun Whitening Perfect Gel
The Hada Labo Koi Gokujyun Whitening Perfect Gel is a moisturizer. Our analysis of its 32 ingredients (19 low-risk) rates it Excellent (90/100). Based on its ingredients, it looks well-suited to oily / acne-prone and dry skin.
The Hada Labo Koi Gokujyun Whitening Perfect Gel is a moisturizer. Our analysis of its 32 ingredients (19 low-risk) rates it Excellent (90/100). Based on its ingredients, it looks well-suited to oily / acne-prone and dry 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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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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Tranexamic Acid
(Cosmetic Astringent, Skin Conditioning) |
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Diglycerin
(Humectant, Skin Conditioning, Solvent) |
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Dipropylene Glycol
(Fragrance, Solvent, Viscosity Decreasing Agent, Masking, Viscosity Controlling) |
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Sorbitol
(Flavoring Agent, Fragrance, Humectant, Plasticizer, Skin Conditioning) |
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Pentylene Glycol
(Skin Conditioning, Solvent) |
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PPG-17-Buteth-17
(Fragrance, Hair Conditioning, Skin Conditioning, Emulsifying, Surfactant) |
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Petrolatum
(Hair Conditioning, Skin Conditioning Agent Occlusive, Skin Protecting, Emollient, Moisturising, Uv Absorber) |
Bad for Oily Skin
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Polyglyceryl-10 Eicosanedioate/Tetradecanedioate
(Hair Conditioning, Skin Conditioning) |
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Butylene Glycol
(Fragrance, Skin Conditioning, Solvent, Viscositydecreasing Agent, Humectant, Masking, Viscosity Controlling) |
Good for Dry Skin
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Carbomer
(Emulsion Stabilising, Viscosity Increasing Agent, Gel Forming, Viscosity Controlling) |
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Diethoxyethyl Succinate
(Solvent) |
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PPG-24-Glycereth-24
(Solvent, Emulsifying, Surfactant) |
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Phenoxyethanol
(Fragrance, Preservative) |
Paraben
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PEG-20 Sorbitan Isostearate
(Sufactant, Emulsifying, Surfactant) |
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Squalane
(Emollient, Hair Conditioning, Refatting, Skin Conditioning) |
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Methylparaben
(Fragrance, Preservative) |
Paraben
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Glyceryl Stearate
(Emollient, Emulsifying) |
Fungal Acne Trigger
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Cetyl Alcohol
(Emulsion Stabilising, Fragrance, Opacifying, Emulsifying, Surfactant, Foam Boosting, Viscosity Increasing Agent, Emollient, Masking, Viscosity Controlling) |
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Behenyl Alcohol
(Binding Agent, Emulsion Stabilising, Viscosity Increasing Agent, Binding, Emollient, Viscosity Controlling) |
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Polyquaternium-51
(Film Forming, Humectant, Skin Conditioning) |
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Disodium EDTA
(Chelating Agent, Viscosity Controlling) |
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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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Triethanolamine
(Fragrance, Ph Adjuster, Emulsifying, Surfactant, Buffering Agent, Masking) |
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Sodium Metabisulfite
(Antioxidant, Preservative, Reducing) |
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Iodopropynyl Butylcarbamate
(Preservative) |
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Ammonium Acrylates Copolymer
(Binding Agent, Film Forming, Viscosity Increasing Agent, Antistatic Agent, Binding, Viscosity Controlling) |
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TOCOPHEROL
(Antioxidant, Fragrance, Skin Conditioning) |
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Hydrolyzed Hyaluronic Acid
(Hair Conditioning, Humectant, Skin Conditioning) |
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3-O-ETHYL ASCORBIC ACID
(Skin Conditioning) |
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Sodium Hyaluronate
(Skin Conditioning, Humectant) |
Good for Dry Skin
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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.
3-O-ETHYL 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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