Can hair be taken from elsewhere than the hair on your head, or can you use someone else hair?

In theory you can harvest donor hair from any part of your own body.  You cannot harvest donor hair from another person because your body will reject it. 

While FUE donor sites from the body are well described and well published, scalp hair remains the best option for transplanting to the scalp.  When donor supply is exhausted, FUE from body sites can be used.  There are certainly advantages and disadvantages to body hair, but this certainly remains a viable option in hair restoration.

Transplant hair can be obtained from other areas of the body such as the beard,chest,arms and back but tend to not be the same quality as head hair.Hair transplanted from another individual would be treated as "foreign" by your body and attacked by your immune system.A genetically identical twin would be the only reasonable option in this situation.