Saw palmetto is a palm tree that grows in the southeastern Unites States and studies have shown it to have a very beneficial affect on hair loss.
Saw palmetto helps block the activity of 5-alpha reductase (5α-R), an enzyme that converts testosterone into a hormone linked to hair loss called dihydrotestosterone (DHT). By reducing the amount of DHT in hair follicles, hair loss can be prevented or slowed down significantly.
A study in 62 adults has shown that applying saw palmetto on the scalp for 3 month period can increase hair destiny by 32%