The 6 Peptide Skin Booster Serum 150ml by Cosrx is a dermatologist-tested, lightweight first-step serum that enhances overall skin condition. Formulated with six potent peptides, niacinamide, and hyaluronic acid, it improves firmness, texture, tone, and soothes sensitive skin while absorbing quickly without stickiness. Apply after cleansing to boost skin resilience, smoothness, and amplify the effects of subsequent serums for soft, revitalized skin.