I purchased this as a stock item about a year ago and have been storing it in a dark place. I'm selling it because I don't think I'll be able to use it all. Please note that I will remove it from the box before shipping. I will wrap it in air-cushion packaging and then package it in a plastic bag for shipping. Thank you. This is a serum containing high concentrations 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 New, unopened Product Details Obagi C25 Serum NEO addresses multiple concerns, including pores*1 and dullness*2, as well as fine lines caused by dryness around the mouth*3, which become more noticeable with age. It moisturizes the skin, leading to clear*4, firm, and radiant skin. Newly formulated with Advanced C Control. The high-penetration formula has been improved. *Extreme: Contains the highest amount of ascorbic acid (skin conditioning and moisturizing ingredient) in the Obagi series. *1: Provides moisture, leading to smooth skin with less noticeable pores. *2: Due to dryness *3: Reduces the appearance of fine lines caused by dryness (efficacy tested) *4: Refers to skin that is moisturized and has a fine texture and luster, with less noticeable pores. How to Use It is recommended to use it twice a day, morning and evening. Vitamin C is particularly effective when used before exposure to UV rays. In the morning and evening, after preparing your skin with toner, take an appropriate amount (4-5 drops) into your palm and apply it to your face. About the Color of the Liquid Due to the nature of the ingredients, the color of the liquid in Obagi C25 Serum may vary. The color range is from colorless and transparent to yellow and brown, but this does not affect the quality of the product, so you can use it with confidence.