COSRX The 6 Peptide Skin Booster Serum

What is this product?

A sensible large-format daily hydrating booster, and a weak choice if the six peptides in the name are the reason for buying. The brand prints each peptide's concentration, which is unusually transparent and also revealing: the six total 12.395 ppm, about 0.0012 percent. What actually fills the formula is a natural-moisturising-factor construction of eight amino acids plus acetyl glucosamine, betaine, sodium PCA, PCA and sodium lactate, which matches what reviewers report (light, helps internal dryness, improves texture). It holds Korean dual functional-cosmetic status for wrinkle improvement and brightening, carried by adenosine and niacinamide at undisclosed levels. Class searches found no fragrance, no drying alcohol, no exfoliating acid and no essential oil. No pH and no brand-cited trial were found in the archived pages.

What makes it different?

Prints an individual concentration for every one of its six named peptides, a disclosure most peptide serums omit, and those printed figures total 0.0012 percent against an amino-acid and NMF block that the product name never mentions.

What is in it?

The full ingredient list as the brand publishes it, in the printed order. Each name links to what we know about that ingredient.

This brand publishes its ingredient list in Korean only. Names below are the matching INCI names from the Korean Cosmetic Association ingredient dictionary, except 5 with no dictionary entry, left in Korean.

• Water
• Dipropylene Glycol
• Glycerin
• Pentylene Glycol
• 1,2-Hexanediol
• Niacinamide
• Acetyl Hexapeptide-8
• Copper Tripeptide-1
• 에스에이치-폴리펩타이드-121
• Dipeptide Diaminobutyroyl Benzylamide Diacetate
• 올리고펩타이드-68
• Palmitoyl Tripeptide-8
• Allantoin
• Sodium Hyaluronate
• Acetyl Glucosamine
• Serine
• Alanine
• Glycine
• Threonine
• Arginine
• Proline
• Betaine
• Sodium PCA
• Sodium Lactate
• 피씨에이
• Glutamic Acid
• 라이신에이치씨엘
• Tocopherol
• Dextran
• Glycine Soja (Soybean) Oil
• Hydrogenated Lecithin
• Ammonium Acryloyldimethyltaurate/VP Copolymer
• Polyacrylate Crosspolymer-6
• Butylene Glycol
• Xanthan Gum
• Ethylhexylglycerin
• Adenosine
• Polyquaternium-51
• Disodium EDTA
• Citric Acid
• Caprylyl Glycol
• t-Butyl Alcohol
• Potassium Sorbate
• 소듐올리에이트

Ingredients with no mark are ones we found nothing notable about, and when marks overlap on one ingredient we show the caution first.

We could not place these in the list above: 돌콩오일, 하이드로제네이티드레시틴, 소듐올리에이트

Did the ad claims hold up?

We checked 5 lines this product advertises against the ingredient list and public documents. One of them holds up. The rest are only partly right or have nothing behind them.

Claims translated from Korean, originals preserved.

Each line is quoted as the brand published it, and each one was read on its own against the ingredient list and the documents the brand publishes.

How we read these lines

What else is worth seeing?

Products we read alongside this one.

• COSRX The 6 Peptide Skin Booster SerumAnother product in the same category
• COSRX The Blue Copper Peptide Bakuchiol Serum, Glow & PlumpingAnother product in the same category