COSRX The 6 Peptide Skin Booster Serum — Efficacy 4.0/5.0, Safety 4.5/5.0 | DemythSkin
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[ DemythSkin Verdict ]
COSRX The 6 Peptide Skin Booster Serum

COSRX The 6 Peptide Skin Booster Serum

SerumHydration
Efficacy
Strong
4.0 / 5.0
Safety
Safe
4.5 / 5.0
System Verdict
This is a legitimately strong hydrating peptide serum, but the “6 peptide” branding does more marketing than heavy lifting. The efficacy score is driven by a well-built leave-on base with glycerin, sodium hyaluronate, betaine, sodium PCA, amino acids, and hydrogenated lecithin, plus a meaningful niacinamide position and supportive peptides; the score is not higher because peptides are mostly supportive, not guaranteed miracle actives, and the formula is still more barrier/hydration-first than a true high-powered treatment.
Active Ingredients Detected
A Tier: Good BasicsProven Results
WaterGlycerinNiacinamideAllantoinSodium HyaluronateAcetyl GlucosamineSerineAlanineGlycineThreonineArginineProlineBetaineSodium PCASodium LactateLysine HClTocopherolGlycine Soja (Soybean) OilHydrogenated LecithinAdenosine
B Tier: Supporting IngredientsPromising Ingredients
Dipropylene GlycolPentylene Glycol1,2-HexanediolAcetyl Hexapeptide-8Copper Tripeptide-1sh-Polypeptide-121Dipeptide Diaminobutyroyl Benzylamide DiacetateOligopeptide-68Palmitoyl Tripeptide-8PCAGlutamic AcidDextranAmmonium Acryloyldimethyltaurate/VP CopolymerPolyacrylate Crosspolymer-6Butylene GlycolXanthan GumPolyquaternium-51Disodium EDTACitric AcidCaprylyl GlycolPotassium SorbateSodium Oleate
D Tier: Potential IrritantsBe Cautious
Ethylhexylglycerint-Butyl Alcohol
Analyze on DemythSkin

DemythSkin is an independent ingredient analyzer. Scores are computed by a deterministic rubric from published clinical evidence — no brand pays for a score.