Serums are where the magic happens. Packed with active ingredients, they’re designed to tackle specific skincare concerns – from dullness and pigmentation to fine lines. And since serums are typically lightweight and fast-absorbing, they should always come before heavier products like moisturisers.

“Apply products from lightest to heaviest,” explains Purcell. “This ensures that thinner, water-based serums sink into your skin before thicker, oil-based moisturisers seal them in.”

You should also keep that tip in mind when layering different serums. If you’re using more than one, make sure the lightest goes on first. Vitamin C serums are great for the daytime to protect against pollution and environmental damage, while a retinol serum at night works wonders for rejuvenating skin while you sleep.

How to layer your skincare products in autumn: an expert guide