Essentially, “oil-in-serum” means that the texture is less liquidy and more goopy. It’s a nice change from the norm given that it makes for better control over dispensing and application.

But fret not, because Amazon has just halved the price of L'Oréal Paris' Age Perfect Le Duo Serum by a whopping 50%. Normally priced at £37.99, this coveted skincare solution is now available ...