Skincare layering order isn't aesthetic preference — it determines whether your actives reach skin or sit on the surface. The simple rule: lightest texture and lowest pH first.
The pH ladder
Acidic actives (vitamin C around pH 3, AHAs around pH 3.5-4) need to be applied to bare or barely-cleansed skin. A product applied over a thick moisturiser doesn't penetrate to where it needs to work.
Less acid-sensitive actives (niacinamide, peptides, hyaluronic acid) can layer on top — they don't need acidic skin to work.
The standard layering sequence
1. Cleanser (morning + evening). 2. Toner if used (usually skip). 3. Acidic active serum (vitamin C in morning, AHA in evening). 4. Wait 60 seconds. 5. pH-neutral serums (niacinamide, peptides, HA). 6. Eye cream if used. 7. Moisturiser. 8. SPF (morning only). 9. Spot treatment if needed (over moisturiser, only on target spot).
The exceptions worth knowing
Retinol over a thin moisturiser layer ('sandwich method') reduces irritation for sensitive users without losing efficacy. Hyaluronic acid before moisturiser only if skin is damp; on dry skin it can draw moisture out instead of in. Acid toners replace the acidic active step — don't add another acid serum on top.
A clear order matters more than the number of steps. Three products in the right order beat seven in the wrong one.