There is a PCOS forum here: http://www.3fatchicks.com/forum/pcos...ce-support-70/
This is the definition of Estronol
Personally after having read it -- and I have PCOS too -- I would think carefully about why you would take it. PCOS is related to a hormone imbalance, but you would have to figure out if your estrogen is low or not (and hopefully why, to address the issue at the source).
I don't take estrogen in any form, but my first doctor who diagnosed me, essentially wanted to balance my extra testosterone by putting me on estrogen-heavy BCP. That didn't fix PCOS.
My issue is related to the endocrine system, which is "fixed" by balancing that system, rather than just throwing more hormones into the mix.
Just my thoughts. The PCOS forum is a little slow sometimes, but there are plenty of other PCOS women that post there and you can get answers there too from articles and questions that are posted.