Hyaluronic acid is one ingredient that does it all – from anti-ageing to helping plump up your skin, it really is a non-negotiable active in your skincare routine. But did you know that it’s practically the ultimate hydrator, too? This cult-favourite ingredient is a humectant, which means that it can hold water and help preserve the moisture in your skin. Get ready for this: It can not only hold its own weight in water, but up to a thousand times that! If you’re already sold, we suggest starting out with L'Oreal Paris' Revitalift Hyaluronic Acid Serum. PS: Don’t forget to layer your hyaluronic acid serum with a moisturiser, especially in the winters! This will help give the serum something to pull moisture from – instead of from your skin.