I don't know and I'm not concerned about it yet. By the time I have been on it for several years (currently been on it about 6 months), they may have developed a very long term option. If not, I retire in 9 years and can accommodate my symptoms. Right now I have to work, be able to think straight and concentrate, so for now it's a Godsend

I don't know what bioidentical HRT is!