people make claims all the time about when to start progesterone but right now no one knows. anyone claiming to have the answer is full of it without the research to back it up. we have to decide for ourselves and we're working in the dark. i started right away. maybe that will turn out to have been a mistake, but id rather bet on having bigger boobs now that let some charlatan bait me into possibly missing the window. and i want to have a libido which i didnt really have for a couple months when i stopped taking it temporarily.

My doc put it to me this way: if you start prog and e together you'll get more cone shaped boobs, if you stay on e only for a few years for your boobs to develop before adding prog you'll get rounder/fuller boobs after prog does it's work. I don't have references/papers that show this to be the case generally tho, just repeating what my doc told me before i started prog

From mostly hearsay that I seen and my recomandtion is when you reach tanner stage 3 and been on it at least a year.

There is not enugh research for any conclusions. Some started immediately and devolope round breast. Other cone shape. Now some develop cone shape even doing tanner stage 3 and a year part so that is even less fact.

Again there is not enugh research but I feel it is bad to gamble. Unless you find a certain feature from progesterone that you feel this important now. Why not wait? You will have tons of bennificts from estrogen and effects from estrogen that is good that you can only point to estrogen instead having to figure out if it either progrestrone or estrogen causing them.

Especially with the very minuscule risk of backdoor dht with progesterone.