The Ultimate S Serum

Sulwhasoo

Where to buy Possibly in stock

About this product

The Sulwhasoo The Ultimate S Serum is a serums, essence, ampoule. Our analysis of its 61 ingredients (45 low-risk) rates it Excellent (97/100). Based on its ingredients, it looks well-suited to oily / acne-prone and dry skin. Heads up: it contains fragrance, which can irritate sensitive or reactive skin.

Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
61
Low-risk
45
Fragrance
Contains fragrance
Origin
South Korea

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 20/13
Good for dry skin
Glycereth-26 Honey Dimethiconol Sodium Polyaspartate Acetyl Octapeptide-3 Acetyl Hexapeptide-8 Panax Ginseng Root Extract Caprylyl Glycol Butylene Glycol Sodium Hyaluronate Glycerin Trehalose Pentaerythrityl Tetraethylhexanoate Hydrogenated Polydecene Dimethicone Bis-PEG-18 Methyl Ether Dimethyl Silane Sodium Polyacrylate PPG-5-Laureth-5 Acetyl Heptapeptide-4 Hydrogenated Poly(C6-14 Olefin)
Caution for dry skin
Dextrin Sodium Methyl Stearoyl Taurate Sorbitan Isostearate Xanthan Gum Glycerin Hydrogenated Phosphatidylcholine Hydrogenated Lecithin Sodium Polyacrylate Sodium Hydroxide Polysorbate 60 PPG-5-Laureth-5 Alcohol Denat. Silica
Oily/Acne-Prone Skin 1/1
Good for oily/acne-prone skin
Alcohol Denat.
Caution for oily/acne-prone skin
Pentaerythrityl Tetraethylhexanoate
Sensitive Skin 5/8
Good for sensitive skin
Bioflavonoids Panax Ginseng Root Extract Glycerin Dimethicone Panax Ginseng Berry Extract
Caution for sensitive skin
Butylene Glycol Glycerin Hydroxypropyl Cyclodextrin Tromethamine Hydrogenated Polydecene Alcohol Denat. Limonene Benzyl Salicylate

Ingredients list

61 total
Lower hazard (1) Higher hazard (7)
All61 Skin Conditioning44 Humectant16 Viscosity Controlling13 Emollient10 Solvent9 Hair Conditioning9 Fragrance7 Emulsion Stabilising7
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
A
Butylene Glycol
(Fragrance, Skin Conditioning, Solvent, Viscositydecreasing Agent, Humectant, Masking, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
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
3
A
Dimethicone
(Antifoaming Agent, Skin Protecting, Emollient, Skin Conditioning)
Silicone
Silicone
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
1
Glycereth-26
(Humectant, Viscosity Decreasing Agent, Solvent, Viscosity Controlling)
1
A
Trehalose
(Flavoring Agent, Humectant, Moisturising)
1
A
Pentaerythrityl Tetraethylhexanoate
(Binding Agent, Skin Conditioning Agent Occlusive, Viscosity Increasing Agent, Emollient, Viscosity Controlling)
1
Polymethylsilsesquioxane
(Opacifying)
A
Hydrogenated Poly(C6-14 Olefin)
(Emollient, Skin Conditioning, Viscosity Controlling)
1
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
A
1,2-Hexanediol
(Solvent)
2
A
Hydrogenated Lecithin
(Skin Conditioning, Emulsifying, Surfactant, Suspending Agent Nonsurfactant)
1
2
A
Silica
(Abrasive, Absorbent, Anticaking Agent, Bulking Agent, Opacifying, Viscosity Controlling)
1
A
Hydrogenated Phosphatidylcholine
(Skin Conditioning, Emulsifying, Surfactant)
3
Bis-PEG-18 Methyl Ether Dimethyl Silane
(Humectant, Foam Boosting, Hydrotrope, Emollient, Hair Conditioning, Skin Conditioning)
PEG-5 Phytosterol
(Emulsifying)
1
A
Dimethiconol
(Antifoaming Agent, Skin Conditioning, Emollient, Moisturising)
Silicone
Silicone
3
A
PEG-10 Dimethicone
(Hair Conditioning, Skin Conditioning)
PARFUM
(Fragrance, Perfuming)
1
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
(Emulsion Stabilising, Viscosity Controlling)
1
A
Ethylhexylglycerin
(Deodorant, Skin Conditioning)
A
Hydrolyzed Ginseng Saponins
(Skin Conditioning)
3
B
Sodium Polyacrylate
(Absorbent, Emulsion Stabilising, Film Forming, Hair Fixing, Skin Conditioning Agent Emollient, Viscosity Controlling Agent, Viscosity Increasing Agent, Binding, Skin Conditioning)
1
Ammonium Acryloyldimethyltaurate/VP Copolymer
(Viscosity Controlling)
2
A
Hydrogenated Polydecene
(Fragrance, Hair Conditioning, Skin Conditioning, Emollient, Solvent)
1
Acrylates/C10-30 Alkyl Acrylate Crosspolymer
(Emulsion Stabilising, Film Forming, Viscosity Controlling)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
1
A
Hydroxypropyl Cyclodextrin
(Chelating Agent, Emulsion Stabilising, Masking, Skin Conditioning)
2
A
Tromethamine
(Fragrance, Ph Adjuster, Buffering Agent, Masking)
1
A
Beta-Glucan
(Bulking Agent, Skin Conditioning)
1
A
Disodium EDTA
(Chelating Agent, Viscosity Controlling)
Methoxy PEG-114/Polyepsilon Caprolactone
(Buffering Agent, Film Forming, Hair Conditioning)
7
Benzyl Salicylate
(Fragrance, Uv Absorber, Masking)
Allergens
Allergens
1
A
Sorbitan Isostearate
(Emulsifying, Surfactant)
3
B
Polysorbate 60
(Emulsifying, Surfactant)
Fungal Acne
Fungal Acne Trigger
1
Bioflavonoids
(Skin Conditioning, Soothing)
3
B
PPG-5-Laureth-5
(Skin Conditioning, Emollient, Emulsifying, Surfactant)
1
A
Dextrin
(Absorbent, Binding Agent, Bulking Agent, Viscosity Increasing Agent, Binding, Viscosity Controlling)
Theobroma Cacao Extract
(Skin Conditioning)
Hydrolyzed Proanthocyanidin
(Antioxidant, Humectant, Skin Conditioning Emollient)
1
Honey
(Flavoring Agent, Humectant, Emollient, Moisturising)
6
Limonene
(Deodorant, Perfuming, Solvent)
Allergens
Allergens
1
Rehmannia Glutinosa Root Extract
(Skin Conditioning)
1
Paeonia Lactiflora Root Extract
(Skin Conditioning)
1
Lilium Candidum Bulb Extract
(Skin Conditioning)
Polygonatum Odoratum Rhizome Extract
(Skin Conditioning)
Panax Ginseng Berry Extract
(Skin Conditioning, Skin Protecting)
NELUMBO NUCIFERA FLOWER EXTRACT
(Skin Conditioning)
1
A
Panax Ginseng Root Extract
(Emollient, Hair Conditioning, Skin Protecting, Tonic)
TOCOPHEROL
(Antioxidant, Fragrance, Skin Conditioning)
1
Phytosphingosine
(Hair Conditioning, Skin Conditioning)
1
Sodium Polyaspartate
(Hair Conditioning, Humectant, Skin Conditioning)
Panax Ginseng Root Protoplasts
(Humectant)
1
A
Caprylyl Glycol
(Hair Conditioning, Skin Conditioning, Emollient, Humectant)
1
B
Sodium Methyl Stearoyl Taurate
(Cleansing, Foaming, Surfactant)
Acetyl Heptapeptide-4
(Humectant, Skin Conditioning)
1
Acetyl Hexapeptide-8
(Humectant, Skin Conditioning)
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
1
Acetyl Octapeptide-3
(Humectant, Skin Conditioning)

My Ingredient Notes

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Key ingredients

Butylene Glycol
Skin Conditioning, Humectant
Glycerin
Humectant, Skin Protecting
Dimethicone
Skin Protecting, Emollient
Alcohol Denat.
Astringent
Glycereth-26
Humectant
Trehalose
Humectant, Moisturising

Benefits

Good for dry skin

Concerns

Contains silicone
Contains eu allergen
Not fungal acne (malassezia) safe
Benzyl Salicylate — higher EWG
May not suit sensitive skin

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 →

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Glycereth-26
Humectant, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 HumectantViscosity decreasing agentSolventViscosity controlling
Trehalose
Flavoring agent, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Flavoring agentHumectantMoisturising
Pentaerythrityl Tetraethylhexanoate
Binding agent, Skin-conditioning agent - occlusive
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentSkin-conditioning agent - occlusiveViscosity increasing agentEmollientViscosity controlling
Polymethylsilsesquioxane
Opacifying
Low-hazard ingredient.Read moreShow less
EWG 1 Opacifying
Hydrogenated Poly(C6-14 Olefin)
Emollient, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A CIR A EmollientSkin conditioningViscosity controlling
Propanediol
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
1,2-Hexanediol
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Solvent
Hydrogenated Lecithin
Skin conditioning, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A Skin conditioningEmulsifyingSurfactantSuspending agent- nonsurfactant
Silica
Abrasive, Absorbent
Low-hazard ingredient.Read moreShow less
EWG 1–2 CIR A AbrasiveAbsorbentAnticaking agentBulking agentOpacifyingViscosity controlling
Hydrogenated Phosphatidylcholine
Skin conditioning, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningEmulsifyingSurfactant
Bis-PEG-18 Methyl Ether Dimethyl Silane
Humectant, Foam boosting
Low-to-moderate hazard.Read moreShow less
EWG 3 HumectantFoam boostingHydrotropeEmollientHair conditioningSkin conditioning
PEG-5 Phytosterol
Emulsifying
Limited public safety data.Read moreShow less
EWG N/A Emulsifying
PEG-10 Dimethicone
Hair conditioning, Skin conditioning
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Hair conditioningSkin conditioning
PARFUM
Fragrance, Perfuming
Limited public safety data.Read moreShow less
EWG N/A FragrancePerfuming
+ 37 more — see the full ingredients list above
Butylene Glycol
Fragrance, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSkin conditioningSolventViscositydecreasing agentHumectantMaskingViscosity controlling Good for Dry Skin
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
Dimethicone
Antifoaming agent, Skin protecting
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Antifoaming agentSkin protectingEmollientSkin conditioning Silicone
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
Dimethiconol
Antifoaming agent, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antifoaming agentSkin conditioningEmollientMoisturising Silicone
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
Benzyl Salicylate
Fragrance, Uv absorber
Higher-hazard ingredient.Read moreShow less
EWG 7 FragranceUv absorberMasking Allergens
Polysorbate 60
Emulsifying, Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B EmulsifyingSurfactant Fungal-acne trigger
Limonene
Deodorant, Perfuming
Moderate-hazard ingredient.Read moreShow less
EWG 6 DeodorantPerfumingSolvent Allergens

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

Officially notified as a cosmetic in Malaysia (NPRA). Government registration record.

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