PCA Skin Intensive Brightening Treatment: 0.5% Pure Retinol Night 2g/0.07oz PCA Skin intensive brightening treatment: 0.5% pure retinol night: A potent night treatment that contains 0.5% pure retinol to help reduce the appearance of fine lines, wrinkles, and uneven skin tone. It also contains niacinamide and resveratrol to help brighten and improve the overall health of the skin.