Retinol is one of the few topicals that are incontrovertibly proven to reduce fine lines and improve skin texture. You can get prescription retinoids like Retin-A, but if you want a gentler, over-the-counter option, you'll find that not all serums are particularly effective. Which is why the retinol facial serum ($11) from Sally Beauty Supply is an amazing deal. It contains a huge dose of retinyl palmitate in a gentle base, so you get immediate results without any "adjustment" period for your skin, and it's so inexpensive that you don't have to feel guilty about using it on your décolleté, shoulders, or anywhere else that needs to get its glow back. Just don't forget to use sunscreen, since it does make your skin solar-sensitive.