COSMO Vitamin C Facial Serum is a brightening, antioxidant rich formula designed to target dullness, dark spots, uneven skin tone, and early signs of aging.According to product listings, it contains Vitamin C (a stable form), often paired with Ferulic Acid or natural fruit extracts to boost radiance and protect the skin from environmental stressors.The lightweight, non greasy texture absorbs quickly, making it suitable for all skin types, including oily and combination skin. It helps improve texture, reduce blemishes, and promote a smoother, more youthful glow.