Try d-chiro inositol. It's a specific form of vitamin B8. Recent studies (I'm sorry I don't have the link, but google them) have shown that the insulin resistance in PCOS women may be partly due to their bodies' excessive flushing of d-chiro inositol. DCI, from what I understand, is a messenger to trigger the body to release the right amounts of insulin at the right time.
Anyway, for what it's worth, my last period was in May. I've been taking metformin since October 14. I read about d-chiro and figured it couldn't hurt, so I added that on Nov 15th. Today is Dec. 6th and I finally got my period. I don't know whether it was one or the combination, but I am so relieved to see light at the end of this tunnel. Good luck!
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