How many sessions of Rivicol are recommended for improving fine lines and skin elasticity?

Now that I'm past my mid-30s, my skin texture has definitely become rough, and fine lines around my eyes and mouth are noticeable whenever I smile. I'm hesitant about the overly dramatic feel of fillers, but since Revicol treatments—which stimulate the body's own collagen production—have been getting a lot of buzz lately, I'm posting this inquiry! How many recommended sessions should I aim for to definitely feel a change in skin density deep within? I've heard that the standard recommended routine is about three sessions at one-month intervals, but I would appreciate it if members who have actually received Revicol could share their experiences or satisfaction levels!