I just had the strangest experience. About 2 months ago, I increased my dose of Metformin ER from 1000 mgs to 1500 mgs, and I recently had bloodwork done. When I got the results, I noticed that ALL of my testosterone levels had normalized (total, free, bioavail, sex HBG)...completely normalized, not a high normal, but actually normal-normal! I haven't had a normal testosterone result in 6 years! I had no idea that I would see this kind of result from Metformin...I'm actually wondering if it's possible that it isn't the Metformin at all, and perhaps something different? I have been having regular (or close to regular) cycles for the past one to two years, even when my testosterone levels were elevated, so I don't know what happened to change the levels so drastically...not that I'm complaining. I'm wondering if anyone else has had a similar experience with Metformin?