I’m quite new to using serums under my moisturizer but I have to say it makes a whole difference during the cold winter months. I have just finished Weleda Pomegranate Firming Face Serum, which I loved. My skin is very dry and using a serum under my normal moisturizer gives it a extra hydrating boost. Another favorite is Bioderma Hydrabio Serum. You can find both of these for a good price in any French Pharmacy or online.