But  there are a  lot of possible  problems. First is that human adult stem cells are rare, of few types  and difficult to isolate.

Most of these are difficult to grow in culture. Much of the work on human adult cells is of hematopoietic stem cells an results of this work can not be generalized to other types.

However, adult stem cells if they can be harnesses have potential to produce  histocompatible transplant which would not trigger immunological responses.