COSRX Advanced Pure Vitamin C 23% Serum combines a high concentration of ascorbic acid (vitamin C) with vitamin E and glutathione. The 23% pure vitamin C content is formulated to provide antioxidant support that targets visible signs of aging such as fine lines, along with uneven skin tone and dullness. Vitamin E works alongside ascorbic acid to help maintain skin hydration and reinforce the skin’s natural barrier, while glutathione contributes additional antioxidant benefits to assist in brightening the complexion. This serum is intended for individuals seeking to improve overall skin radiance and texture through consistent application. The lightweight, silicone-free texture absorbs without heavy residue, making it suitable for a range of skin types, including those with oily or combination skin. Due to the high active concentration, a patch test is recommended before regular use, particularly for those with sensitive or reactive skin. The product is packaged in a 0.7 oz opaque tube to minimize light and air exposure, which helps preserve the stability of the vitamin C formula. In a typical Korean skincare routine, this serum is applied after cleansing and toning, and before moisturizer. The formulation is free from artificial fragrances, parabens, sulfates, and alcohol, focusing on gentle yet effective care. Consistent use may help reduce the appearance of fine lines and promote a more even, luminous skin tone over time. The addition of glutathione supports the serum’s brightening properties, while vitamin E complements the antioxidant action of vitamin C. This product is part of a Korean skincare approach that values ingredient efficacy and skin-friendly formulations.