How long should I typically wait to observe the effects of a cosmetic treatment on my skin?

Overall, for any facial cosmetic product, one must wait at least 4 weeks, which is the duration of a cellular regeneration cycle, to observe effects on the skin.

28 days . During this cycle, new cells are born at the level of the basal layer , which is the deepest layer of the epidermis . As the cycle progresses, these cells migrate to the skin's surface. During this process, they lose their nuclei and transform into dead cells . They then make up the horny layer , the most superficial layer of the epidermis. The dead cells or keratinocytes are then shed (either naturally, or through chemical or mechanical exfoliation) and a new cell cycle begins.

Therefore, 28 days corresponds to the time it takes for the skin to regenerate and fully integrate the benefits of the treatment you regularly apply. This time span is necessary to observe its effects!