I had one session. The physician used two vials. I was initially a little shocked by the amount of swelling. My face and chin looked like "fabio" and not in a good way for about 3-4 days. Afterwards, the results were pretty immediate. I look like I did 20 years ago, maybe better. I am turning 40 this year. I am really astounded by the positive attention I am getting from 20 something males. Really, I didn't think I looked that bad before, but I must have been really showing my age. I would not have anymore sessions, like it is recommended at this point. If the results are so good now, only 3 weeks after, I don't want to over-do it.