not sure if this zenlash eyelash growth serum does much [SEP] i purchased this because it was suppose to be irritation free i have allergies and my eyes get irritated quickly this one stings i do not particularly like it for my lashes but i wanted to something to boost my brows since i have some sparse patches it does not irritate my eyes there it is just not what i expected i cannot say that it has done a lot for lashes or brows either