Some general advice, based on my own experiences:
There’s no such thing as a “breast pill” really; hormones whether natural, synthesised or herbally derived work by getting into the bloodstream and targeting receptors throughout the body. Breast growth is perhaps the most noticeable effect though. I’ve tried herbal based hormones in the past, they are hugely expensive and have little to no effect, so take my advice and don’t bother with these.
Oestradiol is effective and considerably cheaper, it can be bought easily and legally online, otherwise (in the UK) you would need a prescription for it. The most sensible advice would be to see a GP, but he isn’t allowed to prescribe female hormones to men (at least for feminisation purposes). It may vary between health authorities but the system is normally that the GP refers you to a local psychiatrist who then refers you to a gender clinic, who then asses you over a period of time before (hopefully) prescribing hormones or authorising your GP to do so. It’s a bit of a palaver and I know of girls on this site who are still waiting for referral to the gender clinic after more than a year. I saw my GP in March and have my appointment with Charing Cross in November. Perhaps as good as it gets with the NHS.
If you’re not transsexual however, and don’t wish to live full time as a woman (SRS is not essential I believe), you are unlikely to get such a prescription.
Lots of people will jump down my throat if I say that oestradiol is a reasonably safe drug to take, as long as it’s done sensibly. You can get your blood pressure checked on the NHS if you so desire, and there are companies online that will do tests for hormone levels. My GP and the local psychiatrist both said that it’s not particularly essential to test hormone levels, you can have the “right” levels in your blood but that is no guarantee of desired effects since we are all different. “If it seems like it’s working it probably is”, said my GP. Those are opinions of medical practitioners and I neither condone them nor disagree.
Using oestradiol in a gel applied to the skin is almost certainly an even safer method of administration, since it avoids any possible effects on the liver which the tablets might have. As long as you’re sensible, in good health, don’t drink heavily and don’t smoke, then frankly I would ignore those who say self-medicating can be fatal. It can be if you’re stupid, it’s up to you. First thing to do is research. You can’t do too much of that in fact.
If your breasts start to grow people will notice, so anyone self-medicating must be sure of what they actually want.
I’ve achieved “partial feminisation” so far, verging on noticeable, so if I were to stop now those effects may or may not be reversed, but of course I’m not going to stop!
Sorry I’ve rambled on but I believe “real” hormones are the only alternative to “magic breast pills”, and it’s not something anyone should take lightly.
xx