The Ultimate S Serum

Brand price

USD 360.00 · checked 26 Sept 2026 · on the brand's site

From the brand

What the brand says about this product. Our ingredient analysis follows below.

Key Ingredients

• Vitamin E1

  Tocopherols — fat-soluble antioxidants.

  Tocopherol

• Polysorbates (Tween emulsifiers)1

  Polysorbate (Tween) emulsifiers.

  Polysorbate 60

• Hyaluronic acid1

  Hyaluronic acid and its salts; a humectant that binds water to the skin.

  Sodium Hyaluronate

• Peptides1

  Short amino-acid chains used as signalling actives.

  Acetyl Hexapeptide-8

Benefits

• Hydrating18

  Boosts hydration and relieves dry, tight skin.

  Acetyl Heptapeptide-4, Acetyl Hexapeptide-8, Acetyl Octapeptide-3, Beta-Glucan, Bis-Peg-18 Methyl Ether Dimethyl Silane, Butylene Glycol, Dimethicone, Dimethiconol, Glycereth-26, Glycerin, Honey, Hydrolyzed Proanthocyanidin, Panax Ginseng Root Protoplasts, Propanediol, Sodium Hyaluronate, Sodium Polyaspartate, Tocopherol, Trehalose

• Barrier Repair15

  Strengthens and restores the skin's natural barrier.

  Bis-Peg-18 Methyl Ether Dimethyl Silane, Caprylyl Glycol, Dimethicone, Dimethiconol, Glycerin, Hydrogenated Poly(C6-14 Olefin), Hydrogenated Polydecene, Hydrolyzed Proanthocyanidin, Panax Ginseng Berry Extract, Panax Ginseng Root Extract, Pentaerythrityl Tetraethylhexanoate, Phytosphingosine, PPG-5-LAURETH-5, Sodium Polyacrylate, Tocopherol

• Reduces Irritation2

  Eases discomfort and supports skin resilience.

  Beta-Glucan, Bioflavonoids

• Redness Reducing1

  Soothes visible redness and calms irritation.

  Bioflavonoids

• Anti-Aging1

  Softens lines and helps skin look youthful.

  Acetyl Hexapeptide-8

• Firming1

  Supports elasticity and bounce.

  Acetyl Hexapeptide-8

• Smoothing12

  Refines rough or uneven texture.

  Acetyl Hexapeptide-8, Bis-Peg-18 Methyl Ether Dimethyl Silane, Caprylyl Glycol, Dimethicone, Dimethiconol, Hydrogenated Poly(C6-14 Olefin), Hydrogenated Polydecene, Hydrolyzed Proanthocyanidin, Panax Ginseng Root Extract, Pentaerythrityl Tetraethylhexanoate, PPG-5-LAURETH-5, Sodium Polyacrylate

• Oil Control1

  Reduces shine and excess sebum.

  Alcohol Denat.

• Pore Refining1

  Makes pores look smaller and cleaner.

  Alcohol Denat.

• Antioxidant2

  Shields skin from free radical damage.

  Hydrolyzed Proanthocyanidin, Tocopherol

• Anti-Pollution6

  Helps defend against airborne pollutants.

  Dimethicone, Glycerin, Hydrolyzed Proanthocyanidin, Panax Ginseng Berry Extract, Panax Ginseng Root Extract, Tocopherol

Concerns

• May Trigger Acne2

  Can clog pores or trigger breakouts.

  Sorbitan Isostearate, Tocopherol

• May Worsen Seborrheic Dermatitis11

  May feed the yeast involved in seborrheic dermatitis.

  Acetyl Heptapeptide-4, Acetyl Hexapeptide-8, Acetyl Octapeptide-3, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Hydrogenated Lecithin, Hydrogenated Phosphatidylcholine, Phytosphingosine, Polysorbate 60, PPG-5-LAURETH-5, Sodium Methyl Stearoyl Taurate, Sorbitan Isostearate

• May Worsen Keratosis Pilaris2

  May clog follicles or strip skin prone to keratosis pilaris.

  Sorbitan Isostearate, Tocopherol

• May Worsen Irritation5

  May cause stinging, redness or sensitivity.

  Alcohol Denat., Benzyl Salicylate, Fragrance, Limonene, Tocopherol

• May Worsen Eczema4

  May worsen itching or irritation for eczema-prone skin.

  Alcohol Denat., Benzyl Salicylate, Fragrance, Limonene

• May Worsen Rosacea4

  Can trigger flare-ups in rosacea-prone skin.

  Alcohol Denat., Benzyl Salicylate, Fragrance, Limonene

• May Worsen Dryness1

  Can strip moisture and worsen dryness.

  Alcohol Denat.

Dupes

• Sulwhasoo Timetreasure Honorstige Serum69% match
• Sulwhasoo The Ultimate S Infusion Treatment66% match
• Sulwhasoo First Care Activating Serum VI64% match
• Sulwhasoo Concentrated Ginseng Rejuvenating Serum62% match
• Sulwhasoo Lumiwise Brightening Ampoule Serum62% match