COSRX The Vitamin C 23 Serum (Improve Skin Elasticity) 20ml Descriptions A Dark Spot Care Serum for bright and smooth skin by improving hyperpigmentation and uneven skin tone with 23% highly concentrated pure vitamin C. Melanin pigments caused by UV exposure create dark spots and blemishes. 23% pure vitamin can suppress these melanin pigments and improve the uneven skin tone, giving you a bright and lively skin. Allantoin increases collagen synthesis and skin regeneration during the wound healing process, which has a great effect on fading acne scars and marks. Vitamin C, an essential ingredient for collagen synthesis, and vitamin E, a powerful antioxidant to improve skin elasticity and help prevent skin aging.