I started out using the Revitalash “Revitabrow” serum and it worked so well in helping my brows fill in and grow thicker that I decided to try the eyelash serum too! I’ve been using the Revitalash serum for quite a few months and it has done wonders for my eyelashes! My eyelashes are longer, thicker, and healthier than they have been in such a long time! Both products are amazing! I will continue to use the lash and brow serums every night. I will say I’m very consistent with this product. I use it every night before bed. It is part of my night time routine. It is very easy to apply and has never irritated my sensitive eyes which is saying something! I’ve never had any darkness on my eyelids either which can happen with some eyelash serums. 5 star for me!