Cosrx The Vitamin C13 Serum Is A Potent Skincare Serum Formulated With A Concentrated Dose Of Vitamin C. This Serum Aims To Brighten Dull Skin, Reduce Hyperpigmentation, And Promote A More Even Skin Tone. The Lightweight And Non-Greasy Texture Make It Suitable For Daily Use. With Consistent Application, This Serum Can Help Improve The Overall Radiance Of Your Skin, Leaving It Looking Refreshed And Revitalized.