Honestly, I was ready to give up thinking this serum wasn’t working for me, but I finally saw results around 11/12 weeks after I started using it. I’d gradually lost a lot of eyebrow hair due to aging, and nothing else. I really didn’t need much maintenance and didn’t pluck my eyebrows or do anything drastic, so I wasn’t really aware of how gradual the loss was. My college-aged daughter noticed a difference immediately after I visited her on Easter wknd. I knew I was losing eyelashes after many attempts at extensions and different mascaras that seemed to mess with my sensitive eyes. So, I’m now using the lash serum too to see if that’s as successful as the brows, so stay tuned…, but as far as the brows go I recommend giving this a full 3 months and don’t give up!