My doc told me that P causes breasts to grow faster but it makes no difference in overall size. I almost stopped him right there.
"Uh, Doc, how could you possibly know that unless you tried the same person with progesterone from the start and without ever going on progesterone from the start and then compare results? And then repeat with other people hundreds and thousands of times?"
That one is impossible to know for sure, at least the way he stated it.
I think what he was trying to get at is P may make developments happen much faster, and he didn't want to give it to me two weeks into HRT, because there was no talling at that point how well I would adjust to transition. Perhaps I will ask again.