COSRX The 6 Peptide Skin Booster Serum – a lightweight first-step serum with a six-peptide complex
COSRX The 6 Peptide Skin Booster Serum is a watery, toner-like facial serum designed for skin affected by uneven texture, a feeling of dryness, a dull appearance, visible pores, and a loss of firmness. The number in its name is not merely decorative: the formula is built around a complex of six different peptides. Rather than being an intensive serum focused on a single concern, it is a lightweight first step that helps build a layered skincare routine without weighing down the skin.
Six peptides – six different skincare benefits
The product is based not on one universal active ingredient, but on a combination of six peptides to which COSRX attributes different functions: supporting smoother-looking, firmer-feeling skin, soothing, brightening, and caring for the appearance of pores and sebum. The formula is complemented by humectants and components of skin’s natural moisturizing factors, making the serum feel more like a lightweight preparatory layer than a viscous concentrate. The generous 150 ml size reveals its intended role: this is a serum designed to be used more generously and more routinely in your skincare regimen.
- Peptide architecture: Acetyl Hexapeptide-8, Copper Tripeptide-1, sh-Polypeptide-121, Dipeptide Diaminobutyroyl Benzylamide Diacetate, Oligopeptide-68, and Palmitoyl Tripeptide-8 form a multifunctional complex designed to support smoother-, more elastic-, and more even-looking skin.
- Moisture reserve: sodium hyaluronate, betaine, PCA, sodium lactate, and amino acids help maintain the skin’s moisture levels while reducing feelings of tightness and dryness.
- Brightening and smoothing focus: niacinamide and adenosine complement the formula, which is designed to promote a more vibrant-looking complexion and visibly soften the appearance of minor unevenness.
At first, the serum feels almost like a watery toner. It spreads quickly and absorbs without leaving a greasy film, leaving the skin softly hydrated and non-sticky. Thanks to its lightweight texture, it layers naturally under an ampoule, a thicker serum, or a cream. It will appeal most to those who prefer a subtle first-step serum suited to several everyday skincare needs rather than a single, aggressively targeted formula.
Usage
After cleansing your face, apply a small amount of COSRX The 6 Peptide Skin Booster Serum onto your fingertips and gently massage it into your skin, focusing on areas that need extra hydration or improvement. Allow the serum to absorb fully before applying your moisturizer or other skincare products. For best results, use this serum both morning and evening as part of your daily skincare routine.
Ingredients
Water, Dipropylene Glycol, Glycerin, Pentylene Glycol, 1-2-Hexanediol, Niacinamide, Acetyl Hexapeptide-8, Copper Tripeptide-1, sh-Polypeptide-121, Dipeptide Diaminobutyroyl Benzylamide Diacetate, Oligopeptide-68, Palmitoyl Tripeptide-8, Allantoin, Sodium Hyaluronate, Acetyl Glucosamine, Serine, Alanine, Glycine, Threonine, Arginine, Proline, Betaine, Sodium PCA, Sodium Lactate, PCA, Glutamic Acid, Lysine HCl, 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, Sodium Oleate
The manufacturer is responsible for the product’s ingredients. Due to possible changes, we always recommend checking the ingredient list directly on the packaging.



In today's cosmetics market, where labels often resemble pages from a chemistry textbook, Cosrx Cosmetics stands out with its simple yet astonishingly effective approach. Their products contain only carefully selected active ingredients:
However, Cosrx Cosmetics cares not only for your skin but also for the planet. All their products are manufactured following the highest quality standards, without cruel animal testing. Additionally, the brand actively strives to reduce packaging waste and promotes sustainable production practices. Isn't it reassuring to know that your chosen cosmetics contribute to a cleaner planet? It's a double benefit—your skin glows, and the world becomes a little better.








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