Has anybody tried a lash serum that actually works? One of those ones which are supposed to promote lash growth? I've tried a L'Oreal one and a Talika one and am distinctly underwhelmed. I'm a bit scared of the one which can make your eyes change colour, though, so not that one (Rapidlash is it?). Oh and I've tried Vaseline many times too and that does bugger all for me. Thanks!