I went thru a big eyelash loss when trying one of those heated eyelash curlers,and got really scared although after a few weeks they grew back.
Regarding eyelash growing products,i tried the Jan Marini one for quite long time without significant results worth the steep price of the product.
However i have always had excellent and FAST results/lash grown using Mavala Eyelash conditioner,with a reasonable price tag:
Mavala Eye Care - Double-Lash Eyelash Conditioner