cosrx One Step Moisture Up Kit

Ingredients overview

Label order. Colour is our internal rating: green routine, yellow restricted or worth a look, red prohibited or high-risk, grey not yet decoded.

Ingredients are listed in label order; the order reflects the label only, not exact concentrations.

1. Water
2. Cocamidopropyl Betaine
3. Sodium Lauroyl Methyl Isethionate
4. Polysorbate 20
5. Styrax Japonicus Branch/Fruit/Leaf Extract
6. Butylene Glycol
7. Saccharomyces Ferment Filtrate
8. Cryptomeria Japonica Leaf Extract
9. Nelumbo Nucifera Leaf Extract
10. Pinus Palustris Leaf Extract
11. Ulmus Davidiana Root Extract
12. Oenothera Biennis Flower Extract
13. Pueraria Lobata Root Extract
14. Melaleuca Alternifolia Leaf Oil
15. Allantoin
16. Caprylyl Glycol
17. Ethylhexylglycerin
18. Betaine Salicylate
19. Citric Acid
20. Ethyl Hexanediol
21. 1,2-Hexanediol
22. Trisodium Ethylenediamine Disuccinate
23. Sodium Benzoate
24. Disodium EDTA
25. Propolis Extract
26. Butylene Glycol
27. Glycerin
28. Betaine
29. Cetearyl Olivate
30. Sorbitan Olivate
31. 1,2-Hexanediol
32. Betaine Salicylate
33. Panthenol
34. Allantoin
35. Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
36. Sodium Hyaluronate
37. Ethylhexylglycerin
38. Sodium Hydroxide
39. Xanthan Gum
40. Citrus Limon Peel Oil
41. Citrus Aurantium Bergamia Fruit Oil
42. Red Ginseng Water
43. Snail Secretion Filtrate
44. Methylpropanediol
45. Butylene Glycol
46. Glycerin
47. 1,2-Hexanediol
48. Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
49. Allantoin
50. Sodium Polyacrylate
51. Sodium Hyaluronate
52. Ethylhexylglycerin
53. Phenoxyethanol
54. Arginine

Highlights

Free of parabensFree of siliconesFree of sulfatesFree of mineral oilFree of formaldehyde releasersContains PEGContains essential oilsContains EU-26 allergensContains fragranceContains alcoholContains animal-derived

Formulation view Hybrid formula blending mild cleansing surfactants with moisturizing agents. Features yeast filtrate, kudzu root, and various plant extracts. Includes beta salicylate and hyaluronic acid for exfoliation and repair. Best for balanced care routines, though the high number of botanical ingredients requires caution for highly sensitive skin types.

Key ingredients

ANTIPLAQUE

Water

ANTISTATIC

Cocamidopropyl Betaine

CLEANSING

Sodium Lauroyl Methyl Isethionate

SURFACTANT - EMULSIFYING

Polysorbate 20

HUMECTANT

Butylene GlycolSaccharomyces Ferment FiltrateCryptomeria Japonica Leaf Extract

SKIN CONDITIONING

Nelumbo Nucifera Leaf Extract

Other ingredients

Styrax Japonicus Branch/Fruit/Leaf ExtractPinus Palustris Leaf ExtractUlmus Davidiana Root ExtractOenothera Biennis Flower ExtractPueraria Lobata Root ExtractMelaleuca Alternifolia Leaf OilAllantoinCaprylyl GlycolEthylhexylglycerinBetaine SalicylateCitric AcidEthyl Hexanediol1,2-HexanediolTrisodium Ethylenediamine DisuccinateSodium BenzoateDisodium EDTAPropolis ExtractButylene GlycolGlycerinBetaineCetearyl OlivateSorbitan Olivate1,2-HexanediolBetaine SalicylatePanthenolAllantoinHydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate CopolymerSodium HyaluronateEthylhexylglycerinSodium HydroxideXanthan GumCitrus Limon Peel OilCitrus Aurantium Bergamia Fruit OilRed Ginseng WaterSnail Secretion FiltrateMethylpropanediolButylene GlycolGlycerin1,2-HexanediolHydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate CopolymerAllantoinSodium PolyacrylateSodium HyaluronateEthylhexylglycerinPhenoxyethanolArginine

Skim through

Ingredients explained

Water

Primary solvent and base; requires preservative system to prevent microbial growth

Cocamidopropyl Betaine

Cocamidopropyl betaine; zwitterionic co-surfactant reducing irritation and boosting foam, common in mild cleansers.

Sodium Lauroyl Methyl Isethionate

Mild anionic surfactant at 0.5–10%; fine foam, lower irritation than soaps, suitable for gentle cleansing.

Polysorbate 20

Non-ionic emulsifier and cleansing surfactant; contains PEG, control microbial load.

Styrax Japonicus Branch/Fruit/Leaf Extract

Not decoded yet

Butylene Glycol

Polyol humectant and solvent at 1–5%; aids solubilization, light feel

Saccharomyces Ferment Filtrate

Yeast ferment filtrate; humectant and conditioner. May contain peptides, prone to browning, protect from light.

Cryptomeria Japonica Leaf Extract

Cryptomeria leaf extract, humectant & antioxidant; water-soluble, add at low temp to preserve.

Nelumbo Nucifera Leaf Extract

Herbal extract for soothing; limited data, patch test recommended, avoid metal ions.

Pinus Palustris Leaf Extract

Longleaf pine needle extract for toning; contains essential oils, allergen risk for sensitive skin.

Ulmus Davidiana Root Extract

Plant extract for basic skin conditioning; low usage, ensure raw material consistency

Oenothera Biennis Flower Extract

Evening primrose flower extract acting as an astringent; generally safe at standard formulation levels.

Pueraria Lobata Root Extract

Kudzu root extract as humectant; contains isoflavones, limit dose due to endocrine activity.

Melaleuca Alternifolia Leaf Oil

Tea tree oil, antibacterial and sebum regulating; highly sensitizing at concentrate level, dilute; avoid on broken skin.

Allantoin

Skin soother at 0.5-2%; promotes cell regeneration

Caprylyl Glycol

Polyol conditioner and preservative booster at 0.5–3%; emollient feel, often paired with 1,2-hexanediol

Ethylhexylglycerin

Mild conditioner and preservative booster at 0.5–1%; reduces preservative load, smooth feel

Betaine Salicylate

Salicylate derivative for keratolytic and antimicrobial action; milder than salicylic acid.

Citric Acid

Buffer and chelator at 0.1–2%; adjusts pH, may irritate sensitive skin at low pH

Ethyl Hexanediol

Polyol solvent with humectant and mild preservative boost; low viscosity, compatible with many ingredients, gentle.

1,2-Hexanediol

Polyol solvent and preservative booster at 1–5%; light feel, can replace some traditional preservatives

Trisodium Ethylenediamine Disuccinate

Mild chelator replacing EDTA; water-soluble, very low irritation, stabilizes metal ions

Sodium Benzoate

Preservative booster, effective below pH 4.5; combinable with sorbates

Disodium EDTA

Chelating agent at 0.05–0.5%; sequesters metal ions for stability, boosts preservative efficacy

Propolis Extract

Propolis extract for antimicrobial care; complex composition, potential allergy risk.

Butylene Glycol

Polyol humectant and solvent at 1–5%; aids solubilization, light feel

Glycerin

Workhorse humectant at 3–10%; tacky at high levels, pair with occlusives

Betaine

Betaine for mild moisturizing/surfactant; low concentration 1-2% common, high may irritate.

Cetearyl Olivate

Natural emulsifier pairing with glucosides; skin-like feel, biodegradable, prone to oxidation requiring light protection

Sorbitan Olivate

O/W emulsifier, HLB ~15, requires ionic co-surfactant, potential sensitizer.

1,2-Hexanediol

Polyol solvent and preservative booster at 1–5%; light feel, can replace some traditional preservatives

Betaine Salicylate

Salicylate derivative for keratolytic and antimicrobial action; milder than salicylic acid.

Panthenol

Panthenol (vitamin B5) at 1–5%; moisturizing and reparative, supports barrier recovery

Allantoin

Skin soother at 0.5-2%; promotes cell regeneration

Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer

High-molecular-weight thickener and emulsion stabilizer; requires electrolytes or acid adjustment near isoelectric point for optimal performance.

Sodium Hyaluronate

Potent humectant at 0.1–2%; different MW for penetration depth, high levels may draw moisture

Ethylhexylglycerin

Mild conditioner and preservative booster at 0.5–1%; reduces preservative load, smooth feel

Sodium Hydroxide

Strong base neutralizer for pH adjustment; handle with extreme care

Xanthan Gum

Natural thickener at 0.1–1%; provides gel texture, pH-stable, requires full hydration

Citrus Limon Peel Oil

Lemon peel oil for fragrance/skin conditioning; contains allergens, mind phototoxicity and compliance

Citrus Aurantium Bergamia Fruit Oil

Bergamot essential oil, natural fragrance and photosensitizer; limit daytime use or use FCF grade

Red Ginseng Water

Not decoded yet

Snail Secretion Filtrate

Snail secretion filtrate with moisturizing and repairing peptides; animal-derived, monitor purity and allergy risk

Methylpropanediol

Diol solvent and extraction carrier; enhances solubility of actives, low irritation profile.

Butylene Glycol

Polyol humectant and solvent at 1–5%; aids solubilization, light feel

Glycerin

Workhorse humectant at 3–10%; tacky at high levels, pair with occlusives

1,2-Hexanediol

Polyol solvent and preservative booster at 1–5%; light feel, can replace some traditional preservatives

Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer

High-molecular-weight thickener and emulsion stabilizer; requires electrolytes or acid adjustment near isoelectric point for optimal performance.

Allantoin

Skin soother at 0.5-2%; promotes cell regeneration

Sodium Polyacrylate

Superabsorbent resin, <1%; gels with electrolytes, ionic strength control required.

Sodium Hyaluronate

Potent humectant at 0.1–2%; different MW for penetration depth, high levels may draw moisture

Ethylhexylglycerin

Mild conditioner and preservative booster at 0.5–1%; reduces preservative load, smooth feel

Phenoxyethanol

Broad-spectrum preservative at ≤1%; may irritate sensitive eye areas, often paired with ethylhexylglycerin

Arginine

Arginine for moisturizing/conditioning; amino acid, high biocompatibility, often used in blends.

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