2 X 1,000 mg. It supposed to lower the amount of sugar produced in the liver, and increase the sensitivity of muscle cells to insulin.
I don't always see signs of the first claim, I think I'm right in saying that the dawn phenomena is the liver putting glucose into the blood stream. Can't tell about the second claim although I've had three insulin resistance test which have shown it changes. I would need to do the test again, while taking and then not taking to confirm.
I had horrendous problems with metformin in the early days (1997 - 2002). I was put on Rosiglitazone instead, an even bigger disaster. Put back on Metformin and it's nowhere near as bad although I also lowered my carbs which may have had an effect?