Twodogs,
Theres lots of research out there that supporst the usage of Met for all women with pcos, not just those that test IR in the standard tests (glucose tolerance, fasting).
Non-IR patients have been responding well to Metformin treatment in many cases. Resumption of normal ovulatory cycles and luteal phases have been reported in lots of cases. Check out this
link
Theres lots of info, and also a forum here on the board specifically for questions about Met/Glucophage.
Hope this helps!