Skinceuticals  Serum 15 AOX+, 1-Ounce Bottle
Formulated with AOX+ advanced antioxidant technology. Contains a combination of 15% L-ascorbic acid with ferulic Acids to help protect against environmental damage and help reduce visible signs of premature aging. Optimal for all skin type. Note: L-ascorbic acid will oxidize and darken with time, but will remain effective.  May cause a slight tingling sensation.