Revan:
I've done little research on it a while back and recall something about it being relatively unnecessary to "boost" estro and that it may indeed hinder it from working as it should. Albeit phytoestrogens are weak in themselves, too much estrogen will convert back into testosterone.
If I can find the paper somewhere I'll post the findings, but your best bet is to check with your endo.
Hope this helped a little :-)
Be safe,
Marlo