I was skeptical, but this serum really works! It took about a month and a half for me to notice any difference, but now I have much longer lashes. I'm close to three months in with regular applications, sometimes even twice a day, and the product still hasn't run out. On a recent video call with my sister, she thought I was wearing mascara (I wasn't)! INow I'm getting her the lash and brow bundle :)