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[ DemythSkin Verdict ]

COSRX

COSRX The Blue Peptide Bakuchiol Plump Glow Serum 518

Name: COSRX The Blue Peptide Bakuchiol Plump Glow Serum 518
Brand: COSRX

SerumHydration

Efficacy

Strong

4.2 / 5.0

Safety

Safe

4.3 / 5.0

System Verdict

A competent hydrating serum with real brightening support, but the peptide-and-bakuchiol hype outruns the likely treatment strength. The efficacy score is 4.2/5: water, glycols, glycerin, betaine, niacinamide at position 5, and multiple hyaluronic-acid forms provide a credible hydration base, while niacinamide can support brightening and barrier function. Bakuchiol and copper tripeptide-1 appear after the main base and are not disclosed at meaningful percentages, so their anti-aging contribution cannot be assumed to be strong; the numerous peptides and collagen are supportive marketing/formulation features rather than reliable reasons to award a high score. No product pH or packaging information was provided, and the presence of alcohol adds a formulation caveat without automatically making the serum unsafe.

Active Ingredients Detected

A Tier: Good BasicsProven Results

GlycerinNiacinamideBetaineAdenosineTocopherolPanthenolInositolBeta-glucanSodium hyaluronateHyaluronic acidSodium hyaluronate crosspolymerHydrolyzed hyaluronic acidSodium acetylated hyaluronate

B Tier: Supporting IngredientsPromising Ingredients

Diethoxyethyl succinateCopper tripeptide-1BakuchiolAlcoholSodium methyl stearoyl taurateHydroxypropyl starch phosphateDipeptide diaminobutyroyl benzylamide diacetateAcetyl hexapeptide-1Acetyl heptapeptide-4Acetyl hexapeptide-8Acetyl octapeptide-3

C Tier: Marketing IdolsHype | Limited or Weak Data

Hydrolyzed collagen

What Each Ingredient Does

Water: Primary solvent
Butylene glycol: Humectant and solvent
Glycerin: Humectant
Dipropylene glycol: Solvent and humectant
Niacinamide: Multifunctional skin active
1,2-hexanediol: Solvent and preservative booster
Betaine: Humectant and osmolyte
Diethoxyethyl succinate: Light emollient and solvent
Ammonium acryloyldimethyltaurate/vp copolymer: Viscosity and texture modifier
Dimethicone: Silicone emollient and protectant
Copper tripeptide-1: Peptide skin-conditioning agent
Polyglyceryl-6 caprylate: Emulsifier and solubilizer
Polyglyceryl-4 caprate: Emulsifier and solubilizer
Bakuchiol: Retinoid-alternative active
Hydrogenated lecithin: Emulsifier and skin conditioner
Alcohol: Solvent
Sodium methyl stearoyl taurate: Emulsifier and surfactant
Ethylhexylglycerin: Preservative booster and conditioner
Hydroxypropyl starch phosphate: Thickener and stabilizer
Disodium edta: Chelating agent
Adenosine: Skin-conditioning active
Caprylyl glycol: Humectant and preservative booster
Tocopherol: Antioxidant and skin conditioner
Dipeptide diaminobutyroyl benzylamide diacetate: Peptide skin-conditioning agent

Full Ingredient List (INCI)

Water, Butylene glycol, Glycerin, Dipropylene glycol, Niacinamide, 1,2-hexanediol, Betaine, Diethoxyethyl succinate, Ammonium acryloyldimethyltaurate/vp copolymer, Dimethicone, Copper tripeptide-1, Polyglyceryl-6 caprylate, Polyglyceryl-4 caprate, Bakuchiol, Hydrogenated lecithin, Alcohol, Sodium methyl stearoyl taurate, Ethylhexylglycerin, Hydroxypropyl starch phosphate, Disodium edta, Adenosine, Caprylyl glycol, Tocopherol, Dipeptide diaminobutyroyl benzylamide diacetate, Acetyl hexapeptide-1, Acetyl heptapeptide-4, Panthenol, Inositol, Acetyl hexapeptide-8, Sodium hydroxide, Propanediol, Beta-glucan, Sodium hyaluronate, Hyaluronic acid, Sodium hyaluronate crosspolymer, Hydrolyzed collagen, Hydrolyzed hyaluronic acid, Sodium acetylated hyaluronate, Acetyl octapeptide-3 Sources & References Glycerol and the skin: holistic approach to its origin and functions Niacinamide - mechanisms of action and its topical use in dermatology Gehring, W. (2004). Nicotinic acid/niacinamide and the skin. Journal of Cosmetic Dermatology, 3(2), 88

Frequently Asked

Is COSRX The Blue Peptide Bakuchiol Plump Glow Serum 518 worth it?

COSRX The Blue Peptide Bakuchiol Plump Glow Serum 518 scores 4.2 out of 5.0 for efficacy (Strong) and 4.3 out of 5.0 for safety (Safe) on DemythSkin's independent ingredient analysis. A competent hydrating serum with real brightening support, but the peptide-and-bakuchiol hype outruns the likely treatment strength. The efficacy score is 4.2/5: water, glycols, glycerin, betaine, niacinamide at position

What are the key active ingredients in COSRX The Blue Peptide Bakuchiol Plump Glow Serum 518?

COSRX The Blue Peptide Bakuchiol Plump Glow Serum 518 contains no gold-standard actives — its formula is built on supporting and base ingredients rather than clinically transformative actives.

Does COSRX The Blue Peptide Bakuchiol Plump Glow Serum 518 contain fragrance or known irritants?

DemythSkin's analysis found no flagged irritants in COSRX The Blue Peptide Bakuchiol Plump Glow Serum 518. It scores 4.3 out of 5.0 for safety.

How is COSRX The Blue Peptide Bakuchiol Plump Glow Serum 518 scored?

DemythSkin grades every product on two independent axes: efficacy (whether the ingredients have clinical evidence of working) and safety (irritation and sensitisation risk). Ingredients are classified S through D against a database of over 3,000 compounds. No brand pays for a score.

Analyze on DemythSkin →

Analysis last updated: 2026-09-27. DemythSkin is an independent ingredient analyzer. Scores are computed by a deterministic rubric from published clinical evidence — no brand pays for a score.