Thank you for viewing! I am listing the "[4 pieces] GSH Glutathione Serum Glow Facial Serum 30ml Korean Cosmetics." [Condition] New, Unused [Purchase Date] March 2025 [Product Description] GSH Glutathione Glow Facial Serum 30ml Penetrating, Glutathione Serum [How to Use] Use after preparing your skin with toner. Take an appropriate amount in your hand and gently blend into your skin.