Dr. Arvind Poswal from India has done more body hair to head hair transplants (known via the acronym BHT) than any other surgeon in the world. In a large portion of the hair transplant cases that Dr. Poswal has presented online, body hair represents at least a small fraction of the total hair moved to the scalp.
Usually, body hair is used as a supplemental resource in a hair transplant. There is no hair transplant surgeon in the world who has presented as many BHT cases online as Dr. Poswal.
Dr. Arvind Poswal: Body Hair to Scalp Presentation
At the recent ISHRS Conference, Dr. Poswal presented a very interesting overview of all that is involved in BHTs. Luckily for us, this presentation is now available online: