I have had 12 treatments over the past 3 years - just has another this week. I can not say enough good things about this product. Made me feel human again. When I had my very first treatment I looked in the mirror and cried because I was so happy that I looked liked my old self again. I have had 8 treatments that consisted of 2 vials and 4 treatments that consisted of 1 vial (touchups). It is costly but it's worth every penny. Please note, when I first started my face was extremley sunken and was void of most facial fat.