Thank you for viewing! This serum contains a high concentration of Vitamin C to support healthy skin. Brand: Obagi Product Name: Vitamin C Serum Model Name: 25 NEO Volume: 12ml Features: High-concentration Vitamin C serum Purchase Date: September 2025 New and unopened The C Serum series is committed to high concentrations of pure Vitamin C. Among them, Obagi C25 Serum Neo achieves the highest concentration of pure Vitamin C. High Penetration Adopts high penetration technology. Delivers Vitamin C serum thoroughly from the skin surface to every corner of the stratum corneum. Ultra-Stable Contains "pure Vitamin C," which works immediately in the skin (stratum corneum). Successfully stabilized the easily-degraded "pure Vitamin C" through original design. [How to Use] Recommended for use twice a day, morning and night. Vitamin C is especially effective when used before exposure to UV rays. In the morning and evening, after preparing your skin with lotion, take an appropriate amount (4-5 drops) in your palm and apply it to your face. Instant purchase OK! Please ask any questions in the comments!