I was losing hair like crazy after transplant, and my team allowed me to take biotin. They said it was the Tacrolimus. The trauma probably contributed to it as well. It did eventually slow down and started filling in some. However, after I was sick in February I noticed it has started coming out more again, but not the handfuls that it was at first post transplant. Tacrolimus, stress, illness, weight loss, so many things can contribute in addition to normal cycles of shedding. Perhaps talk to your team?