COSRX The 6 Peptide Skin Booster Serum is a lightweight first-step serum formulated with six different peptides and additional skin-supporting ingredients. It is designed to provide an immediate layer of hydration while supporting the appearance of smoother texture, improved elasticity and firmer-looking skin. Its watery texture absorbs quickly and makes it easy to layer underneath other serums and moisturizers. It is a versatile option for people beginning to incorporate peptide-based skincare into their routine.