Secret Science Essence
The Kor Japan Secret Science Essence is a serums, essence, ampoule. Our analysis of its 38 ingredients (28 low-risk) rates it Excellent (95/100). Based on its ingredients, it looks well-suited to oily / acne-prone and dry skin.
The Kor Japan Secret Science Essence is a serums, essence, ampoule. Our analysis of its 38 ingredients (28 low-risk) rates it Excellent (95/100). 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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Propylene Glycol
(Fragrance, Humectant, Skin Conditioningagent Miscellaneous, Solvent, Viscosity Decreasing Agent, Skin Conditioning, Viscosity Controlling) |
Good for Dry Skin
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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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Magnesium Ascorbyl Phosphate
(Antioxidant) |
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Glycosphingolipids
(Skin Conditioning, Emollient) |
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Paeonia Albiflora Root Extract
(Skin Conditioning) |
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Ceramide NG
(Skin Conditioning) |
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Ceramide AP
(Hair Conditioning, Skin Conditioning) |
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Ceramide Ag
(Hair Conditioning, Humectant, Skin Conditioning) |
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Ceramide NP
(Hair Conditioning, Skin Conditioning) |
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Ceramide EOP
(Hair Conditioning, Skin Conditioning) |
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Glutathione
(Fragrance, Reducing) |
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Colloidal Gold
(Antimicrobial, Skin Conditioning) |
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ASCORBIC ACID
(Antioxidant, Buffering, Fragrance, Skin Conditioning) |
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Retinol
(Skin Conditioning) |
Bad for Sensitive Skin
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Sodium DNA
(Skin Conditioning) |
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Sodium Dilauramidoglutamide Lysine
(Humectant) |
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Sodium PCA
(Hair Conditioning, Humectant, Antistatic Agent, Skin Conditioning) |
Good for Dry Skin
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Hydrogenated Lecithin
(Skin Conditioning, Emulsifying, Surfactant, Suspending Agent Nonsurfactant) |
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Tocopheryl Acetate
(Antioxidant, Skin Conditioning) |
Bad for Oily Skin
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PEG-100 Hydrogenated Castor Oil
(Emulsifying, Surfactant) |
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Dihydrocholesterol
(Emollient, Skin Conditioning) |
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Triethylhexanoin
(Fragrance, Hair Conditioning, Antistatic Agent, Emollient, Masking, Refatting, Skin Conditioning, Solvent) |
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Cholesterol
(Emulsion Stabilising, Skin Conditioning, Viscosity Increasing Agent, Emollient, Emulsifying, Stabilising, Viscosity Controlling) |
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Phytosterols
(Skin Conditioning) |
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Sorbitol
(Flavoring Agent, Fragrance, Humectant, Plasticizer, Skin Conditioning) |
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Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling) |
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1,2-Hexanediol
(Solvent) |
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Caprylyl Glycol
(Hair Conditioning, Skin Conditioning, Emollient, Humectant) |
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Butylene Glycol
(Fragrance, Skin Conditioning, Solvent, Viscositydecreasing Agent, Humectant, Masking, Viscosity Controlling) |
Good for Dry Skin
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PPG-26-Buteth-26
(Fragrance, Hair Conditioning, Skin Conditioning, Emulsifying, Surfactant) |
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PEG-40 Hydrogenated Castor Oil
(Fragrance, Emulsifying, Surfactant, Perfuming) |
Fungal Acne Trigger
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Ethylhexyl Palmitate
(Fragrance, Skin Conditioning, Emollient, Perfuming) |
Fungal Acne Trigger
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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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Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking) |
Bad for Sensitive Skin
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Sodium Citrate
(Ph Adjuster, Buffering Agent, Chelating, Masking) |
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Disodium EDTA
(Chelating Agent, Viscosity Controlling) |
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Phenoxyethanol
(Fragrance, Preservative) |
Paraben
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No personal ingredient notes yet. Save ingredients to your profile to get good/bad alerts here.
EWG flags hazard, not real-world risk — ratings don't account for how much of an ingredient a product contains. Treat these as things to research, not verdicts. How we score →
How to use
General guidance from this product's category and active ingredients — always follow the directions on the package.
Trust & honesty
Contains ingredients some choose to avoid or double-check while pregnant or nursing.
Topical retinoids (retinol, retinaldehyde, retinyl esters) are widely advised against in pregnancy as a precaution. The strongest evidence is for ORAL retinoids; topical absorption is low, but most clinicians err on the side of caution.
This is general information, not medical advice. Pregnancy guidance varies and depends on concentration and your individual situation — always check with your doctor, midwife or pharmacist. How we flag this.
The concentrations these actives are typically effective at in research — not a measurement of this product.
Most studied between 0.1% and 1%. Higher is not automatically better — irritation climbs with dose, so a well-formulated lower strength is often the sweet spot.
Retinol
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.
Magnesium Ascorbyl Phosphate, 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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Alternatives
Other products people analyze alongside this one.