Exfolie Serum The importance of sunscreen cannot be stressed enough. With exposure to sun come a variety of problems that can only be tackled by protecting skin from the sun. Exfolie Serum Reviews "Your skin has a natural barrier to retain moisture, and essential to that is omega-3 fatty acid," Joanna advises. "Flax seeds on your salad or even walnuts will be an instant boost to your omega-3, thus increasing your skin's ability to hold onto moisture." And be sure to eat a diet low in foods with a high glycemic index .