COSRX The 6 Peptide Skin Booster Serum

What it is

COSRX The 6 Peptide Skin Booster Serum is a daily pre-serum designed to prime the skin and enhance the performance of everything you apply next. Powered by a complex of six peptides, it helps smooth texture, refine the look of pores, and support a firmer, well-hydrated complexion without heaviness or stickiness.

Lightweight watery texture

Fast-absorbing, water-light liquid that layers seamlessly under serums, moisturizers, and SPF. Skin feels fresh, bouncy, and comfortable—never tight or greasy.

Key ingredients

• Multi-Peptide Complex (6 types) – Targets the look of fine lines, elasticity, and overall skin bounce.
• Niacinamide – Helps refine the look of pores and even skin tone.
• Sodium Hyaluronate (Hyaluronic Acid) – Draws in moisture for a smooth, plump feel.
• Adenosine – Supports a firmer, more resilient appearance.
• N-Acetyl Glucosamine – A gentle skin-refining support ingredient.
• Allantoin – Soothes and promotes comfortable wear.

Benefits

• Primes skin and boosts absorption of subsequent skincare
• Visibly smooths and refines texture and the look of pores
• Lightweight hydration with a fresh, non-sticky finish
• Pairs well with Vitamin C, niacinamide, and retinoids
• Suitable for all skin types, including sensitive

How to use

After cleansing (and toner if you use one), apply 2–3 pumps to face and neck morning and evening. Pat in until absorbed, then follow with your serum, moisturizer, and—AM only—sunscreen. If your skin is reactive, patch test first and start once daily.

Ingredients (INCI)

Aqua (Water), Glycerin, Niacinamide, Sodium Hyaluronate, Adenosine, N-Acetyl Glucosamine, Allantoin, a multi-peptide complex, and other skin-conditioning and stabilizing agents. Please refer to the product packaging for the complete and most up-to-date ingredient list.