PCA Skin Intensive Brightening TreatmentRejuvenate your complexion while you slumber with the PCA Skin Intensive Brightening Treatment: 0. 5% Pure Retinol Night. Working with your body's natural renewal process, this potent treatment delivers pure, potent ingredients deep within your skin to promote a clear, radiant expression. Using a patented OmniSome delivery system, retinol is absorbed into your skin. This cocktail of vitamins and antioxidants promotes radiance from within while