Is it true that female donor hair that is transplanted does not become permanent and may eventually fall out of the transplanted area whereas male transplanted hair will never fall out?
Whatever happens to the donor area will happen to the transplanted hairs in their new location. Female genetic alopecia is often diffuse and when it progresses, it impacts the donor area with miniaturization that is progressive, so you will see that impact in the recipient area for donor hair as the miniaturization progresses. In most men, the donor area is spared from miniaturization, so when this hair is transplanted into the recipient area it reflects that stability seen in the donor area and is not lost. In other words, men have that ring of hair around their heads (often called the permanent zone), whereas women aren’t going to necessarily have that same permanent area.