Some people who have dry skin or whose skin gets dry in the wintertime may find they need a bit more moisture in addition to the "Key 4" range. That's where Skingredients Skin Good Fats (£44) ceramide-barrier moisturiser comes in. "Ceramides are ideal because they help to lock in that moisture, and [this product] offers a quick hit of hydration," Rock said. And whilst she acknowledges that sometimes a bit of extra moisture is needed, Rock explained that she'd rather people try and use Skin Protein if they can. "By using vitamin A, you help your stratum corneum on the top [of the skin] seal together," which ultimately will help your skin hold onto moisture in the first place.