4 years ago I spend 9 months on Raw Ovarian Glandular capsules made/sold by Swanson. My personal experience is that it wasn't worth the time and money spend. I went to real HRT via a gender therapist referral and endocrinologist. I did photograph my "progress" and in those 9 months I had a small breast growth. Once I started to use testosterone blockers and estrogen + progesterone pills I started to grow my breast. (and be warned: lots of other things change also, you will feminize completely)
1 year ago I switched to estradiol injections and my boobs have grown better. I am now 38C.
If you do research to BO herb etc., you will find different people telling different stories. My story is my experience, and I understand everyone is different. But I can tell you that among all my transgender friends, both local and online, no one is doing herbs, just doctor monitored HRT.
If you do decide to go that way, be advised that everything will change, your fertility goes away (no more sperm) no more spontaneous erections, testicles will shrink in size signifently, volunteer erections are still possible but in a lower strength. This will start in the first couple of months, 6 months on HRT is considered the point of no return.
But you where asking about the herbs, so let me stop, I just wanted to give you advise. Bottom line is, you can not get just the boobies, it's a full package. Which is great if you want it. 😃
BTW, I am a post-op trans woman.
Let me know if you like more info, just ask.
Erin.