Sun exposure breaks down collagen, leaving your skin sagging like a deflated balloon. Shock it back into shape, literally, with one of the new over-the-counter products (like Aveeno Ageless Vitality Restorative Night Treatment
, $40; target.com
) that uses electricity to rejuvenate skin, says Miami dermatologist Leslie Baumann. By layering two creams with opposing chargesa gray mineral concentrate followed by a white activator cream—you increase the flow of ions into the skin, boosting collagen.