Doctor Babor Lifting Cellular Collagen Boost Infusion (4 x 7ml), $268.

With the aid of something called biomimetic (no idea – sorry), its creators say it boosts the skin’s natural collagen production. Now collagen, in case you don’t know this already, is the stuff that keeps your skin looking firm and plump and youthful. And this serum does make skin look incredibly youthful. Like we said, we don’t know what biomimetic is … but who cares when it clearly works!