COSRX The Vitamin C 23 Serum is a 20ml formula engineered to deliver potent brightening and antioxidant benefits using stabilized vitamin C technology. This expert-developed serum combines 23% vitamin C with supporting actives to enhance skin radiance, reduce dark spots, and provide comprehensive antioxidant protection. The lightweight serum texture absorbs efficiently, delivering concentrated treatment without heaviness or irritation, making it suitable for daily application and all skin types seeking visible brightening results. The vitamin C 23 technology works synergistically to brighten complexion, enhance radiance, reduce hyperpigmentation, provide antioxidant protection, and support collagen production with consistent use. The advanced formula is dermatologist-tested and clinically proven, ensuring safety and efficacy without harsh chemicals or unnecessary additives. The concentrated 20ml size provides extended application across multiple treatments. Ideal for those seeking professional-grade brightening with high-potency vitamin C and proven K-beauty efficacy, this serum delivers visible results. Apply to clean, dry skin morning and evening, allowing full absorption before additional products. Experience visibly brighter, more radiant skin with reduced dark spots, enhanced luminosity, improved tone evenness, and a smooth, revitalized appearance.