The only source of info I've ever found is from the Transfemme website. All other websites (mustgrowbreasts, among others) I've read seem to lead back to Transfemme as their source of info. So, we all sit here scared of BO, myself included, because one website makes the fantastic claim that a male taking BO will set in motion the permanent effect of aromatising T into E, and unless we want to be female, as opposed to merely growing breasts, we should not take BO.
I would love it if anyone could find some corroborating evidence the claims from Transfemme are true--that BO will turn a man into a woman hormonally and permanently. Even more interesting is the claim on the Transfemme website that they used to sell a reversal pill, but decided to stop. I would think such a pill would have a great market and would increase sales of Transfemme since a lot more men would use it to grow breasts, then want to reverse the aromatization and not be women, just men with breasts.
There's a part of me that wants to say ingesting any kind of dehydrated internal organs results in the body processing it just like any other meat product and the stomach acids and enzymes just treat it as protein. On the other hand, my thyroid medication is made of dehydrated pig thyroid so maybe BO does actually do something. I believe Cheryl used BO, and she had amazing results.