How many sessions do I need to improve my skin texture?

Lately, when I look in the mirror, I often feel that my skin texture isn't what it used to be. Even when I apply makeup, it doesn't look as smooth as before, and there are many days when my skin looks dry and dull, so I am looking into skin booster treatments. After searching online, it seems that treatments like Vitaran or water-glow injections are quite popular. However, I am wondering how many sessions are typically required to see noticeable changes. I would also like to know if a single session is effective or if I need to receive treatments at regular intervals.

There are conflicting reviews, with some saying the pain is severe and others saying it was better than expected, so I would like to hear from those who have actually experienced it. Since I am considering this procedure for the first time, I would also appreciate your advice on which treatment would be best to start with.