I'm really hoping for some hair regrowth, I've been on HRT for 7 months now and I haven't noticed any difference on my head. (I did notice a huge change when it came to the hair on my face, which went from shave twice a week to not having shaved for months and months now.)
But I believe the reason why I got so thin hair is because, well, I don't eat as I should. I average about 450 kcal a day. I just don't get hungry and forget to eat.
So, as long as you eat, I believe there is a high chance of noticing a positive improvment.