Some of Sephoras eyelash repair products range from $18 to $125! Of course the most expensive one is one of the most fast acting products, "Peter Thomas Roth Lashes To Die For". I heard fabulous things about it..it repairs lashes quickly.

Personally I use Talika Eyelash Lipocils, its a $40 eyelash conditioner. I apply it twice a day as recommended and definitely see results. Conditioning your eyelashes is just as important as putting on a daily moisturizer on your face!
