Saw palmetto is a low growing species of palm that grows in coastal areas from Mexico to the Carolinas. It has been used for centuries by Native Americans as both food and medicine. Saw palmetto is used by millions of men who suffer from BPH or prostate enlargement. The reason that it works on BPH is that it reduces levels of the chemical DHT in the body. DHT also is responsible for most hair loss in men. Some herbal practitioners swear by the powers of saw palmetto to stop or slow hair loss in men and women. For more about the benefits of saw palmetto see: Does Saw Palmetto Prevent Hair Loss?