Reduce discoloration as you sleep with PCA Skin Intensive Brightening Treatment: 0.5% Pure Retinol. Experience brighter, more radiant skin with less discoloration. This pure retinol treatment is powerfully formulated with retinol, resveratrol and niacinamide to encourage a bright, even skin tone. Potent, stable ingredients are packed in a patented Omnisome delivery system to carry ingredients deeper into the skin for superior results.