I have had hair thinning which stopped since my amalgams were taken out. I did some research on this, and after putting a few pieces together, concluded...

Mercury-related balding is caused by high levels of dihydrotestosterone (DHT) in both men and women. Blocking DHT's action is vital to preventing hair loss.

Saw Palmetto is key to reducing DHT levels and therefore may stop balding. You would have to take it faithfully.