The order in which you apply skincare matters as much as the products themselves, because a layer applied in the wrong sequence can block the one beneath it or wash the one above it away. The reliable rule is to go from thinnest to thickest, from most watery to most occlusive, so that each step can absorb and the final moisturizer can seal everything in.A morning routine follows a predictable structure. Cleansing comes first to start from a clean base, followed by a treatment step such as a vitamin C serum, because actives absorb best on bare, dry skin. Moisturizer goes next to lock in hydration, and sunscreen is always the final step, since it needs to sit on top as an even film and anything applied over it can disturb the protective layer that SPF relies on.The logic behind thin-to-thick is absorption. Watery toners and serums sink in quickly and carry active ingredients deeper, while creams and oils form a barrier that would trap them on the surface if applied first.
Applying a thick moisturizer before a serum means the serum never reaches the skin, and applying sunscreen before moisturizer means the SPF film gets diluted and uneven,
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