How to Layer Serums Correctly: A Dermatology-Backed Skincare Routine Guide For most lightweight, water-based serums, the usual order is cleanser, serum, then moisturizer. Finish morning skincare with sunscreen. Follow the directions for each formula and any prescribed treatment first. A thin-to-thick rule is a useful starting point, but an oil-based or dual-phase serum can have … Continue reading How to Layer Serums Correctly: A Dermatology-Backed Skincare Routine Guide