The morning routine of Anastasia Hartmann.
A look at 6 steps that become reality in 8 minutes.
The short answer is that it depends: on the concentration, on the formulation and on what the skin already gets. Actives do not work in advertising but in a formulation, and that has a say.
Robust studies work with defined concentrations over defined periods. A product that carries the same active at a fraction of the dose may name it, but it may not claim the effect of the study. This is exactly where most misunderstandings arise.
In practice that means: look at the INCI list, note the position of the active in it and give the product time. Visible changes in skin quality need a full renewal cycle, i.e. around four to six weeks, regardless of what the packaging says.
Skin quality is a result of consistency, not of active density.
If in doubt, start with the simplest working setup: cleansing, one active for the main concern, care, sun protection. Everything else is added once this setup is in place, and not before.
This article does not replace medical or cosmetic advice.