In what order should I apply skincare products?

The general rule is to apply products from thinnest to thickest consistency. A standard morning routine goes: cleanser, toner or essence, serums, eye cream, moisturizer, then SPF. At night, after cleansing, apply serums like retinol or acids, followed by a richer moisturizer or facial oil on top. This order maximizes absorption of active ingredients before heavier products seal them in.