Skinceuticals Serum 20 AOX+, 1-Ounce Bottle

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Formulated with AOX+ advanced antioxidant technology. Contains a precise combination of 20% L-ascorbic acid with ferulic Acids to help protect against environmental damage and help reduce visible signs of premature aging.  Optimal for normal or oily skin. Note: L-ascorbic acid will oxidize and darken with time, but will remain effective. May cause a slight tingling sensation.