What is the difference between a face oil and a face serum?

Serums are lightweight, water-based concentrates designed to target specific skin concerns -- like hyperpigmentation or fine lines -- and are applied before moisturiser. Face oils are richer, oil-based formulas that nourish the skin barrier, lock in moisture, and deliver fat-soluble antioxidants like polyphenols and vitamin E. For best results: apply serum first (thinner texture), then face oil on top to seal in the actives.