I've been using the lash serum for about 8 weeks and I've seen noticeable lash growth. My lashes have become fuller and also longer than I've ever seen them before. They are still fairly straight, but they're holding up to curling much better (I don't seem to be losing eyelashes like I used to while curling). I'm really happy with the results so far and the serum didn't seem to irritate my skin either.