Andrew Huberman· PhD
It's also important, by the way, if you're going to take this route, that you actually leave that solution on the scalp for 3-5 minutes. This is important and should make complete sense as to why it's important. You can't just rub the stuff into your head and then rinse it off and expect it to be absorbed. It actually needs to seep down into those hair follicles and access the niche.