It does appear to work–at least on eyebrows!
So I waited to write this review.  While I was disappointed this couldn't be used on bottom lashes like some serums I did use it on my eyebrows since I had a patchy place on one - I accidently shaved it a couple of years ago and it never came back right.  Why doesn't the hair above our lips not come back???  Anyway, so for about the first, I would say, three weeks - using it day and evening I really couldn't tell a difference.  Was going to write it off as a loss and try something more expensive.  Then well, whadda ya know, around the fourth week, sounds like 1/3 left in the bottle maybe, I realized the little bald patch was gone and the eyebrow had evened out.  I've also noticed growth on both eyebrows now - so, admittedly it's a little wild.  I'm 54 so eyebrow hair gets a little weird at this age and the serum seems to create the growth that I would get...not filling in but on top and below and a bit coarse and wiry.  Something to consider if you are older - it will grow the eyebrow hair, but not 20 year younger results, if that makes sense?  I am perfectly happy with it though - I can trim and there is a base to fill in with a little bit of pencil - much nicer than patchy spots with none there!  For the price I think it's spot on.  I've been doing my upper eyelids at night now and will edit if I notice anything there.  Mostly I'm just considering it insurance against fall out since I'm using mascara again and will be trying an eyelash curler...they are actually fine now.
Rating: 5 stars