Forehead wrinkles, frown lines, laughter lines... They came, they saw, they conquered and now the sun's made them even worse. To stop them in their tracks and prevent new ones appearing (they're often caused by sun exposure and smoking), opt for treatments that contain suitable active ingredients such as hyaluronic acid (low molecular weight, so that it penetrates your skin) and retinol. Why? To boost collagen production, stimulate fibroblast production, plump up your features, smooth lines/wrinkles and leave you with a uniform skin texture. For added action, apply both a serum and a cream.