lash serum help

hey guys I really want to develop super long, thick eyelashes but I keep seeing everyone say completely different things about different lash serum brands, how it makes your eyes red? you lose eye fat? I just want long lashes, if anyone has a pic of their eyelash journey and the lash serum they use i'd really appreciate it because I'm really trying to grow my lashes. also any side effects? Just so i'm aware!