What it is: A lightweight, nongreasy hyaluronic serum that helps repenish skin and lock in moisture while smoothing, softening and brightening.Who it's for: All skin types.What it does: This simple yet powerful serum helps promote a radiant complexion. It works by adjusting the rate of moisture absorption based on relative humidity in the air to provide the perfect amount of long-lasting hydration to skin. It also helps reduce the appearance of pores and fine lines and helps calm and soothe skin, too. How to use: After cleansing and toning, apply one or two pumps to your face, neck and/or d?colletage. Use morning or night. You can also use it on your lips, underneath your eyes or on dry patches throughout your body.