I have long enough eyelashes, so therefore, I got this Lash IQ Natural Eyelash Growth Serum for my sister who hardly has eyelashes. She applied this before applying her daily mascara. This was easy to apply, did not cause irritations (she never really gets irritation) and you only need to apply it once. It was almost as if her eyelashes were instantly longer. Once she applied the mascara it was almost like she had completely different eyelashes!