[jorisabomo]

The answer is continuously.



I believe a little progesterone would be useful for transgender.....I really don't know enough to advise how aggressive to be with it.

Exactly, but be reminded progesterone is hit and miss like everything else, when it comes to breast growth. There are some girls who explode from it, while others barely grow at all. With that being said, it actually does lot of good things health wise (though some side effects for many). For one, it wards off an enlarging prostate.

Some of these effects only apply to cis-gender women, but most are equally effective in all genders.

http://www.yourlifesource.com/progesterone-effects.htm