Do you know any good lash growth serums?

My lashes are really small and straight. For months I was setting extensions one by one every month but besides the fact that it is really expensive I was feeling like I depend my confidence only on that. Extensions also thin your lashes and you can't renew them for an eternity.

I have never used serums but I heard that they are actually doing pretty good job. But I also read that they have some bad side effects like thinning the skin around your eye and ages you faster (?) smth like that.

Does anyone have experience with that?