This intensely moisturising serum is just what the doctor ordered for cooler, drier Autumnal months. Hyaluronic acid is the gold-standard ingredient for hydration amongst consultant dermatologists, and the Avon Anew Anti-Wrinkle Plumping Concentrate (£12, originally £15) contains three different versions of the stuff. More specifically, it contains three different molecular weights of hyaluronic acid, which allows for increased hydration both on the epidermis (the surface of your skin) and the dermis (the layer underneath the surface).