Length Extending Lash Serum

I didn't see any growth or improvement in my lashes. I use Mascara daily and have semi brittle lashes. I was hoping this would soften and condition my lashes. I used this as a nightly treatment but...

I didn't see any effect on my lashes after a few weeks of use: it didn't hurt my lashes--I guess it did keep them conditioned--but it didn't cause any improvement length or thickness. The serum...