Price performer with quality packaging [SEP] This serum keeps my facial skin moist.  I have been using it daily for a month, applying it before my moisturizer, and have not noticed any difference in my skin's appearance but I also know that facial products need to be consistently used for a dedicated period of time in order to see change.  With 20% vitamin C in its composition, it has one of the highest Vitamin C levels in  serums on the market.  The price is excellent as well.  I can buy four bottles of this serum for what I was paying for a product with a lesser vitamin C concentrate.  The dark brown glass packaging keeps the product from rapidly deteriorating.  Just ordered my second bottle.