COSRX – The 6 Peptide Skin Booster Serum
🇰🇷 South Korea
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COSRX The 6 Peptide Skin Booster Serum is not just a serum—it’s the foundation step that transforms how your entire skincare routine performs.
Designed to be applied immediately after cleansing, this lightweight booster wakes up the skin and creates the ideal environment for hydration, repair, and active ingredient absorption. Think of it as a skin reset: refreshing, conditioning, and priming the skin so everything you apply afterward works better, deeper, and more efficiently.
At the heart of the formula is COSRX’s 6-Peptide Complex, carefully balanced to support firmness, elasticity, and skin renewal without irritation. Peptides work as skin messengers—helping the skin maintain structure, resilience, and a smoother appearance over time. This makes the serum ideal not only for early anti-aging care, but also for strengthening tired, dehydrated, or stressed skin.
To support moisture and comfort, Hyaluronic Acid delivers fast, lightweight hydration that plumps the skin without heaviness, while Amino Acids help reinforce the skin barrier and prevent moisture loss throughout the day. N-Acetyl Glucosamine (NAG) further enhances skin texture and clarity, supporting a more even-looking complexion with consistent use.
The texture is watery-light, non-sticky, and instantly absorbing, making it perfect for layered routines—whether minimalist or multi-step. It never pills, never clogs pores, and sits beautifully under toners, essences, serums, creams, sunscreen, or makeup.
Gentle, fragrance-free, and alcohol-free, this booster is especially loved by sensitive skin types and anyone who wants visible results without irritation. Over time, skin appears more hydrated, smoother, firmer, and naturally balanced—with improved glow and refined texture.
This is the step that quietly elevates your routine—the difference-maker you didn’t know you were missing.
Ingredient
Ingredient
Water, Butylene Glycol, Glycerin, N-Acetyl Glucosamine, Betaine, 1,2-Hexanediol, Sodium Hyaluronate, Copper Tripeptide-1, Acetyl Hexapeptide-8, Oligopeptide-1, Oligopeptide-2, Oligopeptide-3, Oligopeptide-6, Oligopeptide-7, Arginine, Glycine, Serine, Alanine, Proline, Threonine, Lysine, Sodium PCA, Allantoin, Panthenol, Carbomer, Ethylhexylglycerin
Why You'll Love It
Why You'll Love It
- ✨ Skin-Prep Powerhouse
Prepares the skin to absorb serums and creams more effectively, maximizing results from your entire routine. - 💧 Instant & Long-Lasting Hydration
Hyaluronic Acid and amino acids deliver deep moisture without heaviness or shine. - 🧬 6-Peptide Firming Care
Supports elasticity, smoothness, and skin resilience—perfect for early anti-aging and prevention. - 🌿 Gentle Yet Effective
Fragrance-free, alcohol-free, and suitable for sensitive skin and daily use. - 🎯 Texture & Pore Care
Helps refine skin texture and balance excess sebum for a smoother, healthier look. - 🪶 Ultra-Lightweight Feel
Watery, fast-absorbing texture that layers effortlessly with any skincare routine. - 🌙☀️ AM & PM Friendly
Works beautifully morning and night, under sunscreen or nighttime treatments. - 🤍 Minimalist, Skin-First Formula
Focused on performance, not fillers—exactly what COSRX is known for.
How To Use
How To Use
When:
Morning & evening, immediately after cleansing and before toner or essence.
How:
- Apply 1–2 pumps onto clean skin
- Gently spread and pat until absorbed
- Follow with toner, serum, and moisturizer
💡 Beauty Tip
Use this as your first hydration step to noticeably boost the performance of actives like Vitamin C, Niacinamide, Retinol, or Peptides applied afterward.
Easy 4 steps to use
Cosrx 6 Peptide Serum
Prep with Toner
Start with a clean face and apply your favorite toner to balance your skin and boost absorption.
Dispense the Serum
Apply 2–3 drops of the serum into your palm or directly onto your face using clean hands.
Apply Gently
Pat the serum evenly over your face and neck. Use fingertips to press it into your skin—no rubbing!
Let It Absorb
Wait a few seconds for the serum to fully absorb before applying your moisturizer or sunscreen.
The Foundation Step Your Skin Has Been Waiting For
This lightweight skin booster is designed to be the very first step after cleansing, awakening the skin with hydration, peptides, and barrier-supporting ingredients—so every product that follows works better, deeper, and more effectively.
6-Peptide Firming Care
Supports elasticity and smoothness for resilient, healthy-looking skin.
Supports elasticity and smoothness for resilient, healthy-looking skin.
Watery-Light Texture
Ultra-light formula absorbs instantly and layers effortlessly.
Ultra-light formula absorbs instantly and layers effortlessly.
Barrier Support
Amino acids and conditioning agents help strengthen the moisture barrier.
Amino acids and conditioning agents help strengthen the moisture barrier.
Alcohol-Free Formula
Gentle on skin, without drying alcohol or harsh irritants.
Gentle on skin, without drying alcohol or harsh irritants.
Sensitive-Skin Friendly
Designed for daily use, even on reactive or delicate skin types.
Designed for daily use, even on reactive or delicate skin types.
AM & PM Ready
Perfect for morning and evening routines, under sunscreen or night care.
Perfect for morning and evening routines, under sunscreen or night care.
How Skin Responds Over Time
As hydration levels improve and the skin barrier is supported, the complexion looks clearer and more even. Skin feels firmer, smoother to the touch, and better prepared to maintain moisture throughout the day.
Strengthen & Seal Your Skin Barrier
After prepping the skin with COSRX The 6 Peptide Skin Booster, lock in hydration and reinforce the skin barrier with Dr. Althea 147 Barrier Cream. This pairing helps maintain moisture balance, soothe sensitivity, and keep skin feeling comfortable, resilient, and well-protected throughout the day.