If you’re someone that pays close attention to their skin, there’s likely been (or will be) a defining moment in your life where you notice that your skin doesn’t have quite the same look and feel that it used to. Whether this unfortunate revelation happens at 25 or 45, it’s bound to happen. And when it does, we want you to be prepared with the best possible plan of action. That plan of action? It’s Retinol. What is Retinol? A…