ROGAINE AFTER 12 HOURS REDDIT - DOES IT WORK?

Yo dudes, so I'm thinking on using Rogaine. Heard some stuff about it making a difference after just short amount of hours, but that seems kinda sketchy, right? Anyone else try this magic potion and actually see changes in that time frame? Hit me up with your thoughts. Here's a few things I'm curious: What much Rogaine do you gotta use? Should