Hasn't hurt...
Hair growth is so hard to judge as it is a slow process.  My husband has been using this serum for a few months.  He doesn't have a large balding area, just some thinning at the front sides.  This serum has not caused any irritation and he hasn't had any additional hair loss.  I am still monitoring for gains, but anything that even keeps your hair at baseline is a win.
Rating: 4 stars