Advanced The 23 Serum

After cleansing and toning, apply 2 to 3 drops to the entire face and pat gently for better absorption.

Avoid using alongside copper peptide products, including COSRX's Blue Peptide Serum & Cream, as well as other high-concentration actives such as retinol; for best results, use them at different times of day (morning/evening) to optimize absorption and maximize the benefits of each product.

COSRX's Advanced The Vitamin C 23 Serum features a high strength 23% pure vitamin C with Super Vitamin E and Glutathione to target uneven skin tone, early signs of aging, and dullness. Ideal for experienced vitamin C users seeking visible brightening and firmer skin, it absorbs smoothly to leave the complexion more radiant, supple, and revitalized.