Some of my friends are using a non-prescibed progesterone cream on their breasts, to give them a fuller appearance and a darker nipple area. Well, that's the intention. I've been urged to do the same. But being cautious where such things are concerned, I've read Dr Richard Curtis's essay on progesterone (there's an easy link to it on the Gires website). I've also read a rebuttal of his views. Both sides draw attention to the lack of clinical evidence where trans women are concerned, and the rebuttal discounts the natural experience of natal women.
What does one conclude?
Much seems to depend on how badly you want larger breasts, what side-effects you will tolerate, and how ready you are to scorn specialist advice and go your own way. Any of these might affect your attitude and beliefs on progesterone use.
In my own case, I have inherited medical conditions that make adding yet another drug to the mix something I'd rather not do without a proper medical opinion and a proper prescription. I simply won't court danger for some extra boob bulk - assuming that I actually would get any!
I'm in any case not flat-chested. There is enough of a bust to fill out the sort of clothes I like to wear. But not enough to be eye-catching. This isn't a problem. I can be adequately female with only the suggestion of a cleavage, and although I'd be delighted if I had bigger breasts, it won't ruin my life if there is no further growth in that department. There are many other things I can use to express my femininity: my eyes, my mouth, my voice, my hair, my arms and hips and legs, my clothes. How I move. My personality. All at no additional cost. And with no medical risk.
The question of risk also makes me recoil from breast implants. Plus the consideration that this does not involve natural tissue growth, but an artificial, manufactured bag of gel which has a limited lifespan. And I can't be sure that ten years hence I'll be able to afford replacements. If I can't, what then?
Well, that's how it is for me. I'm not saying anything about what someome else should do. So far as I can see, an awful lot of people think progesterone and/or boob implants are a Good Thing, and in real life perfectly safe and sensible. Like wine and chocolate! Just don't beat me up for being very careful.