I'd need to follow-up with a better source or link (on my phone currently) but I believe Stamets talked about this on that same Joe Rogan Experience which is what initially piqued my interest and at the time I felt a bit desperate to try anything. I was unaware of the link between Lion's Mane and hair loss but I don't believe I've experienced any from daily dosing. For what it's worth, I already have a mildly receding hairline anyway but I don't believe it's been made worse.