Does the Order You Apply Skincare Actually Matter?

The general principle of skincare layering is straightforward: apply lighter, water-based products first, and heavier, oil-based products last. The logic is that lighter formulations absorb more readily, while heavier products create a barrier that can prevent lighter ones from penetrating.

The logic is sound. The execution is where it gets complicated.

In practice, most people have a rough sense of the right order but don't know the specifics. Where does a vitamin C serum go relative to a niacinamide? Should retinol go before or after moisturiser? Does the order of two serums matter if they're both water-based?

The answers to these questions depend on the specific formulations, their pH levels, and their mechanisms. The general rule is a starting point, not the full picture.

What order affects

Layering order primarily affects absorption. A heavy occlusive applied before a water-based serum can prevent the serum from reaching the skin. An acid-based treatment applied after a rich moisturiser may be buffered to the point of reduced activity.

But order also affects tolerance. Applying a retinoid directly to bare skin increases penetration and potential irritation. Applying it over a thin layer of moisturiser reduces penetration but improves tolerance. Neither is wrong. The right approach depends on your skin's sensitivity.