At 57, your natural actions of your ovaries are toning down yet again. It's not like at 51 they switch from on to off, they gradually add less and less hormonal action to your system. Try adjusting the dose of the bi-est before giving up on it.
Thanks Annie, I am trying to up the dose. I need my estrogen to function?
That's the way I feel. Hope my doctor agrees, as I age. I don't intend to ever drop it entirely.